Metric Tab Lock Washers | McMaster-Carr

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420 Products

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Split

Stop nuts and screws from loosening due to light vibration

284 products

Tooth

Grip better than split lock washers in applications with constant movement

130 products

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Countersunk

Grip flat- and oval-head screws for a secure hold without overtightening

7 products

Wave

Keep bolted assemblies secure on slightly uneven surfaces

19 products

Split Lock Washers

Stop nuts and screws from loosening due to mild vibration. As you tighten, the uneven ends bite into the nut or screw so it won't back out. While they're not as vibration resistant as other lock washers, they are a great fit for electrical panels, light fixtures, and other light duty assemblies. Split lock washers are not reusable, and they only work with fasteners that have right-hand threads.

18-8 Stainless Steel—The choice for wet and outdoor environments, these washers won't rust when exposed to moisture. However, they can't hold up to the harsh chemicals that 316 stainless steel can.

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these washers have a dark, matte coating to create a finished look. They won't rust in wet and outdoor environments, but can't hold up to harsh chemicals as well as 316 stainless steel.

Super-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these washers won't degrade when exposed to harsh weather, salt water, and most chemicals.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.

Black-Oxide Steel—Typically chosen for their appearance, these washers have a dark, matte coating that creates a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

Blue-Dyed Steel—These metric-sized washers have a distinctive blue color, so you can easily tell them apart from inch washers. The coating provides only minimal corrosion resistance, so these washers are best for dry environments.

Steel—Best for dry environments since moisture will cause these washers to rust.

Corrosion-Resistant Galvanized Steel—These washers combine the strength of steel with the rust resistance of stainless steel. They're an alternative to 18-8 stainless steel in wet and outdoor environments, but they won't hold up to salt water and chemicals.

Super-Corrosion-Resistant Zinc-Flake-Coated Steel—With 40 times the corrosion resistance of zinc-plated steel, these withstand rust as well as 316 stainless steel. They have been tested to extreme standards, including 1,000 hours of salt spray. They are similar to Magni-coated washers.

Super-Corrosion-Resistant Silicon Bronze—The choice for marine environments, these washers won't rust or deteriorate when submerged in salt water. They resist corrosion as well as 316 stainless steel, but are not quite as strong.

	For Screw Size	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel


		M2	2.4	4.4	0.4 to 0.6	DIN 127B	100	92148A050	00000
		M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	92148A070	0000
		M2.6	3.0	5.2	0.5 to 0.7	DIN 127B	100	92148A110	0000
		M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	92148A150	0000
		M3.5	3.9	6.7	0.7 to 0.9	DIN 127B	100	92148A155	0000
		M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	92148A160	0000
		M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	92148A170	0000
		M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	92148A180	0000
		M7	7.5	12.8	1.5 to 1.7	DIN 127B	50	92148A311	0000
		M8	8.5	14.8	1.9 to 2.1	DIN 127B	100	92148A200	0000
		M10	10.7	18.1	2.0 to 2.4	DIN 127B	100	92148A210	00000
		M12	12.7	21.1	2.3 to 2.7	DIN 127B	50	92148A214	00000
		M14	14.7	24.1	2.8 to 3.2	DIN 127B	25	92148A221	00000
		M16	17.0	27.4	3.3 to 3.7	DIN 127B	25	92148A241	00000
		M18	19.0	29.4	3.3 to 3.7	DIN 127B	10	92148A251	0000
		M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	92148A261	0000
		M22	22.5	35.9	3.8 to 4.2	DIN 127B	5	92148A111	0000
		M24	25.5	40.0	4.8 to 5.2	DIN 127B	10	92148A271	00000
		M27	27.5	43.0	4.8 to 5.2	DIN 127B	5	92148A112	00000
		M30	31.7	48.2	5.8 to 6.2	DIN 127B	1	92148A281	0000
		M36	37.7	58.2	5.8 to 6.2	DIN 127B	1	92148A291	0000

		Black-Oxide 18-8 Stainless Steel


				M2	2.4	4.4	0.4 to 0.6	DIN 127B	10	92148A331	0000
				M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	10	92148A332	0000
				M3	3.4	6.2	0.7 to 0.9	DIN 127B	10	92148A333	0000
				M5	5.4	9.2	1.1 to 1.3	DIN 127B	10	92148A334	0000
				M6	6.5	11.8	1.5 to 1.7	DIN 127B	10	92148A335	0000
				M8	8.5	14.8	1.9 to 2.1	DIN 127B	10	92148A336	0000
				M10	10.7	18.1	2.0 to 2.4	DIN 127B	10	92148A337	0000
				M12	12.7	21.1	2.3 to 2.7	DIN 127B	10	92148A338	0000
				M16	17.0	27.4	3.3 to 3.7	DIN 127B	10	92148A339	0000
				M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	92148A341	00000

				Super-Corrosion-Resistant 316 Stainless Steel


						M2	2.4	4.4	0.4 to 0.6	DIN 127B	100	92153A406	0000
						M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	92153A411	0000
						M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	92153A416	0000
						M3.5	3.9	6.7	0.7 to 0.9	DIN 127B	100	92153A451	0000
						M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	92153A418	0000
						M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	92153A422	0000
						M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	92153A426	0000
						M8	8.5	14.8	1.9 to 2.1	DIN 127B	100	92153A429	0000
						M10	10.7	18.1	2.0 to 2.4	DIN 127B	50	92153A434	0000
						M12	12.7	21.1	2.3 to 2.7	DIN 127B	50	92153A436	00000
						M14	14.7	24.1	2.8 to 3.2	DIN 127B	25	92153A439	0000
						M16	17.0	27.4	3.3 to 3.7	DIN 127B	10	92153A442	0000
						M18	19.0	29.4	3.3 to 3.7	DIN 127B	10	92153A445	0000
						M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	92153A447	0000
						M24	25.5	40.0	4.8 to 5.2	DIN 127B	5	92153A449	0000
						M30	31.7	48.2	5.8 to 6.2	DIN 127B	1	92153A453	0000

						Zinc-Plated Steel


								M2	2.4	4.4	0.4 to 0.6	DIN 127B	100	91202A214	0000
								M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	91202A218	0000
								M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	91202A222	0000
M3.5								3.6	6.7	0.7 to 0.9	DIN 127B	100	91202A224	0000
M4	4.4							7.6	0.8 to 1.0	DIN 127B	100	91202A226	0000
M5	5.4							9.2	1.1 to 1.3	DIN 127B	100	91202A230	0000
M6	6.5							11.8	1.5 to 1.7	DIN 127B	100	91202A234	0000
M7	7.5							12.8	1.5 to 1.7	DIN 127B	100	91202A111	0000
M8	8.5							14.8	1.9 to 2.1	DIN 127B	100	91202A238	0000
M10	10.7							18.1	2.0 to 2.4	DIN 127B	100	91202A242	0000
M12	12.7							21.1	2.3 to 2.7	DIN 127B	100	91202A246	00000
M14	14.7							24.1	2.8 to 3.2	DIN 127B	100	91202A250	00000
M16	17.0							27.4	3.3 to 3.7	DIN 127B	50	91202A253	00000
M18	19.0							29.4	3.3 to 3.7	DIN 127B	25	91202A112	00000
M20	21.2							33.6	3.8 to 4.2	DIN 127B	25	91202A257	00000
M22	22.5							35.9	3.8 to 4.2	DIN 127B	10	91202A113	00000
M24	25.5							40.0	4.8 to 5.2	DIN 127B	25	91202A261	00000
M27	28.5							43.0	4.8 to 5.2	DIN 127B	10	91202A114	00000
M30	31.7							48.2	5.8 to 6.2	DIN 127B	10	91202A263	00000
M33	33.5							55.2	5.8 to 6.2	DIN 127B	5	91202A115	00000
M36	37.7							58.2	5.8 to 6.2	DIN 127B	5	91202A265	00000
M42	43.7							68.2	6.8 to 7.2	DIN 127B	1	91202A116	00000
M48	50.5							75.0	6.8 to 7.2	DIN 127B	1	91202A117	00000

Zinc-Yellow-Chromate-Plated Steel


								M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	96982A151	0000
								M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	96982A152	0000
		M5						5.4	9.2	1.1 to 1.3	DIN 127B	100	96982A153	0000
		M6	6.5					11.8	1.5 to 1.7	DIN 127B	100	96982A154	0000
		M8	8.5					14.8	1.9 to 2.1	DIN 127B	100	96982A155	0000
		M10	10.7					18.1	2.0 to 2.4	DIN 127B	100	96982A156	00000
		M12	12.7					21.1	2.3 to 2.7	DIN 127B	50	96982A157	0000
		M14	14.7					24.1	2.8 to 3.2	DIN 127B	50	96982A158	00000
		M16	17.0					27.4	3.3 to 3.7	DIN 127B	25	96982A159	0000
		M18	19.0					29.4	3.3 to 3.7	DIN 127B	25	96982A161	00000
		M20	21.2					33.6	3.8 to 4.2	DIN 127B	10	96982A162	0000
		M24	25.5					40.0	4.8 to 5.2	DIN 127B	10	96982A163	0000
		M30	31.7					48.2	5.8 to 6.2	DIN 127B	5	96982A164	00000

		Black-Oxide Steel


				M6				6.5	11.8	1.5 to 1.7	DIN 127B	100	97093A214	00000
				M8	8.5			14.8	1.9 to 2.1	DIN 127B	100	97093A215	00000
				M10	10.7			18.1	2.0 to 2.4	DIN 127B	50	97093A216	0000
				M16	17.0			27.4	3.3 to 3.7	DIN 127B	25	97093A218	0000

				Blue-Dyed Steel


								M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	93279A123	0000
								M4	4.5	7.6	0.8 to 1.0	DIN 127B	100	93279A124	0000
								M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	93279A125	0000
								M6	6.2	12.1	2.0	ASME B18.21.2M	100	93279A100	00000
								M6	6.5	11.8	1.5 to 1.7	DIN 127B	50	93279A110	0000
								M8	8.2	15.2	2.5	ASME B18.21.2M	100	93279A200	0000
								M8	8.5	14.8	1.9 to 2.1	DIN 127B	50	93279A120	0000
								M10	10.2	18.0	2.9	ASME B18.21.2M	50	93279A300	0000
								M10	10.7	18.1	2.0 to 2.4	DIN 127B	25	93279A130	0000
								M12	12.3	21.7	3.8	ASME B18.21.2M	100	93279A400	00000
								M12	12.7	21.1	2.3 to 2.7	DIN 127B	25	93279A140	0000
								M16	16.4	27.9	4.8	ASME B18.21.2M	25	93279A500	00000
								M16	17.0	27.4	3.3 to 3.7	DIN 127B	25	93279A150	00000
						M20		20.5	33.8	5.7	ASME B18.21.2M	10	93279A600	0000
						M20	21.2	33.6	3.8 to 4.2	DIN 127B	10	93279A160	0000
						M24	24.5	40.7	7.2	ASME B18.21.2M	10	93279A700	00000

						Steel


								M2	2.4	4.4	0.4 to 0.6	DIN 127B	100	91169A050	0000
								M2.5	2.9	5.1	0.5 to 0.7	DIN 127B	100	91169A070	0000
								M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	91169A150	0000
								M3.5	3.9	6.7	0.7 to 0.9	DIN 127B	100	91169A155	0000
								M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	91169A160	0000
								M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	91169A170	0000
								M6	6.5	11.8	1.5 to 1.7	DIN 127B	100	91169A180	0000
								M8	8.5	14.8	1.9 to 2.1	DIN 127B	100	91169A200	0000
								M10	10.7	18.1	2.0 to 2.4	DIN 127B	100	91169A210	0000
								M12	12.7	21.1	2.3 to 2.7	DIN 127B	100	91169A214	0000
								M14	14.7	24.1	2.8 to 3.2	DIN 127B	100	91169A220	00000
								M16	17.0	27.4	3.3 to 3.7	DIN 127B	50	91169A240	00000
								M18	19.0	29.4	3.3 to 3.7	DIN 127B	50	91169A242	00000
								M20	21.2	33.6	3.8 to 4.2	DIN 127B	25	91169A245	00000
								M24	25.5	40.0	4.8 to 5.2	DIN 127B	25	91169A248	00000
								M30	31.7	48.2	5.8 to 6.2	DIN 127B	5	91169A244	00000
								M36	37.7	58.2	5.8 to 6.2	DIN 127B	1	91169A249	0000

Corrosion-Resistant Galvanized Steel


								M6	6.5	11.8	1.5 to 1.7	DIN 127B	50	91169A310	0000
								M8	8.5	14.8	1.9 to 2.1	DIN 127B	50	91169A320	00000
								M10	10.7	18.1	2.0 to 2.4	DIN 127B	50	91169A330	00000
								M12	12.7	21.1	2.3 to 2.7	DIN 127B	25	91169A340	0000
								M16	17.0	27.4	3.3 to 3.7	DIN 127B	10	91169A350	0000
								M20	21.2	33.6	3.8 to 4.2	DIN 127B	1	91169A360	0000

								Super-Corrosion-Resistant Zinc-Flake-Coated Steel


										M6	6.5	11.8	1.5 to 1.7	DIN 127B	25	90491A101	0000
										M8	8.5	14.8	1.9 to 2.1	DIN 127B	25	90491A102	00000
										M10	10.7	18.1	2.0 to 2.4	DIN 127B	25	90491A103	00000

		Super-Corrosion-Resistant Silicon Bronze


										M3	3.4	6.2	0.7 to 0.9	DIN 127B	100	97093A201	00000
										M4	4.4	7.6	0.8 to 1.0	DIN 127B	100	97093A202	00000
										M5	5.4	9.2	1.1 to 1.3	DIN 127B	100	97093A203	00000
										M6	6.5	11.8	1.5 to 1.7	DIN 127B	50	97093A204	00000
										M8	8.5	14.8	1.9 to 2.1	DIN 127B	25	97093A205	00000
										M10	10.7	18.1	2.0 to 2.4	DIN 127B	10	97093A206	0000

Split Lock Washers for Socket Head Screws

Stop socket head screws from loosening due to mild vibration. These washers have a small diameter to fit under screws with narrow heads, but are still thick enough to keep fasteners secure. While they're not as vibration resistant as other lock washers, they are a great fit for electrical panels, light fixtures, and other light duty assemblies. Split lock washers are not reusable, and they only work with fasteners that have right-hand threads. Also known as high-collar lock washers.

Super-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these washers won't degrade when exposed to harsh weather, salt water, and most chemicals.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.

	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel


	M3	3.4	5.6	0.9 to 1.1	DIN 7980	100	91111A118	00000
	M3.5	3.9	6.1	0.9 to 1.1	DIN 7980	100	91111A119	0000
	M4	4.4	7.0	1.1 to 1.3	DIN 7980	100	91111A121	0000
	M5	5.4	8.8	1.5 to 1.7	DIN 7980	100	91111A124	0000
	M6	6.5	9.9	1.5 to 1.7	DIN 7980	100	91111A129	0000
	M8	8.5	12.7	1.9 to 2.1	DIN 7980	100	91111A132	0000
	M10	10.7	16.0	2.3 to 2.7	DIN 7980	100	91111A135	00000
	M12	12.7	18.0	2.3 to 2.7	DIN 7980	50	91111A138	0000
	M14	14.7	21.1	2.8 to 3.2	DIN 7980	10	91111A141	0000
	M16	17.0	24.4	3.3 to 3.7	DIN 7980	10	91111A143	0000
	M18	19.0	26.4	3.3 to 3.7	DIN 7980	10	91111A145	0000
	M20	21.2	30.6	4.3 to 4.7	DIN 7980	10	91111A147	00000
	M22	23.5	32.9	4.3 to 4.7	DIN 7980	5	91111A149	00000
	M24	25.5	35.9	4.8 to 5.2	DIN 7980	5	91111A151	0000
	M30	31.7	44.1	5.8 to 6.2	DIN 7980	1	91111A155	00000

	Super-Corrosion-Resistant 316 Stainless Steel


			M3	3.4	5.6	0.9 to 1.1	DIN 7980	100	94241A510	0000
			M4	4.4	7.0	1.1 to 1.3	DIN 7980	100	94241A520	0000
			M5	5.4	8.8	1.5 to 1.7	DIN 7980	100	94241A530	0000
			M6	6.5	9.9	1.5 to 1.7	DIN 7980	100	94241A540	0000
			M8	8.5	12.7	1.9 to 2.1	DIN 7980	50	94241A550	0000
			M10	10.7	16.0	2.3 to 2.7	DIN 7980	50	94241A560	00000
			M12	12.7	18.0	2.3 to 2.7	DIN 7980	25	94241A570	00000
			M14	14.7	21.1	2.8 to 3.2	DIN 7980	10	94241A580	0000
			M16	17.0	24.4	3.3 to 3.7	DIN 7980	10	94241A590	0000
			M18	19.0	26.4	3.3 to 3.7	DIN 7980	10	94241A610	0000
			M20	21.2	30.6	4.3 to 4.7	DIN 7980	1	94241A620	0000
			M22	23.5	32.9	4.3 to 4.7	DIN 7980	1	94241A630	0000
			M24	25.5	35.9	4.8 to 5.2	DIN 7980	1	94241A640	0000
			M30	31.7	44.1	5.8 to 6.2	DIN 7980	1	94241A650	00000

			Zinc-Plated Steel


					M3	3.4	5.6	0.9 to 1.1	DIN 7980	100	93837A110	0000
					M4	4.4	7.0	1.1 to 1.3	DIN 7980	100	93837A120	0000
					M5	5.4	8.8	1.5 to 1.7	DIN 7980	100	93837A130	0000
					M6	6.5	9.9	1.5 to 1.7	DIN 7980	100	93837A140	0000
					M8	8.5	12.7	1.9 to 2.1	DIN 7980	100	93837A230	0000
					M10	10.7	16.0	2.3 to 2.7	DIN 7980	100	93837A150	00000
					M12	12.7	18.0	2.3 to 2.7	DIN 7980	100	93837A240	00000
					M14	14.7	21.1	2.8 to 3.2	DIN 7980	50	93837A250	00000
					M16	17.0	24.4	3.3 to 3.7	DIN 7980	25	93837A160	0000
					M18	19.0	26.4	3.3 to 3.7	DIN 7980	25	93837A170	00000
					M20	21.2	30.6	4.3 to 4.7	DIN 7980	10	93837A180	0000
					M24	25.5	35.9	4.8 to 5.2	DIN 7980	10	93837A190	0000
					M27	28.5	38.9	4.8 to 5.2	DIN 7980	5	93837A260	0000
					M30	31.7	44.1	5.8 to 6.2	DIN 7980	5	93837A210	00000
					M36	37.7	52.2	6.7 to 7.3	DIN 7980	1	93837A220	0000

					Zinc-Yellow-Chromate-Plated Steel


							M4	4.1	7.0	1.1 to 1.3	DIN 7980	100	93837A310	0000
							M5	5.1	8.8	1.5 to 1.7	DIN 7980	25	93837A320	0000
							M6	6.1	9.9	1.5 to 1.7	DIN 7980	100	93837A330	0000
							M8	8.1	12.7	1.9 to 2.1	DIN 7980	100	93837A340	0000
							M10	10.2	16.0	2.3 to 2.7	DIN 7980	100	93837A350	00000
							M12	12.2	18.0	2.3 to 2.7	DIN 7980	100	93837A360	00000
M16							16.2	24.4	3.3 to 3.7	DIN 7980	25	93837A370	00000

Black-Oxide Steel


							M3	3.4	5.6	0.9 to 1.1	DIN 7980	100	91190A510	0000
							M3.5	3.9	6.1	0.9 to 1.1	DIN 7980	100	91190A515	0000
							M4	4.4	7.0	1.1 to 1.3	DIN 7980	100	91190A520	0000
							M5	5.4	8.8	1.5 to 1.7	DIN 7980	100	91190A530	0000
							M6	6.5	9.9	1.5 to 1.7	DIN 7980	100	91190A540	0000
							M8	8.5	12.7	1.9 to 2.1	DIN 7980	100	91190A550	0000
							M10	10.7	16.0	2.3 to 2.7	DIN 7980	100	91190A560	00000
							M12	12.7	18.0	2.3 to 2.7	DIN 7980	100	91190A570	00000
							M14	14.7	21.1	2.8 to 3.2	DIN 7980	100	91190A580	00000
							M16	17.0	24.4	3.3 to 3.7	DIN 7980	50	91190A590	00000
							M18	19.0	26.4	3.3 to 3.7	DIN 7980	25	91190A600	0000
							M20	21.2	30.6	4.3 to 4.7	DIN 7980	25	91190A610	00000
							M22	23.5	32.9	4.3 to 4.7	DIN 7980	10	91190A620	0000
							M24	25.5	35.9	4.8 to 5.2	DIN 7980	10	91190A630	00000
							M27	28.5	38.9	4.8 to 5.2	DIN 7980	5	91190A650	0000
	M30						31.7	44.1	5.8 to 6.2	DIN 7980	5	91190A670	00000
	M36	37.7					52.2	6.7 to 7.3	DIN 7980	1	91190A690	0000
	M42	43.7					60.2	7.7 to 8.3	DIN 7980	1	91190A660	00000
	M48	50.5					67.0	7.7 to 8.3	DIN 7980	1	91190A640	00000

Split Lock Washer Assortments

Image of Product. Front orientation. Lock Washers. Split-Lock Washer, Sold as Assortments.

Keep a collection of common lock washers on hand to stop nuts and screws from loosening due to mild vibration. These washers have split ends that bite into the fastener to keep it secure. While they're not as vibration resistant as other lock washers, they are a great fit for electrical panels, light fixtures, and other light duty assemblies. Split lock washers are not reusable, and they only work with fasteners that have right-hand threads.

Labels in the lid include our part numbers, so it's easy to replenish the assortments.

Steel—Best for dry environments since moisture will cause these washers to rust.

	Sizes Included	Specs. Met	Container Type		Each
18-8 Stainless Steel


	755	For M3 to M20 Screw Sizes	DIN 127B	Plastic Box	91170A409	0000000

	Steel


			755	For M3 to M20 Screw Sizes	DIN 127B	Plastic Box	91170A109	00000

Tooth Lock Washers

Grip tighter than split lock washers to prevent nuts and screws from loosening in applications with constant movement, such as conveyors. Tooth lock washers typically can't be reused because the teeth often get bent when tightened.

External Tooth

Teeth on the outside edge bite into both the fastener and the mating surface for a stronger hold than internal-tooth lock washers. However, they may mar your material and snag on objects. Pair these washers with nuts and screws that are large enough to make contact with the teeth, such as pan, button, and binding head screws.

Super-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these washers won't degrade when exposed to harsh weather, salt water, and most chemicals.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

DIN 6798—Best for slightly bumpy or irregular surfaces because the teeth are angled to make even contact with the material.

	For Screw Size	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel


		M2	2.2	4.5	0.2 to 0.4	DIN 6798	100	91120A311	00000
		M2	2.3	4.5	0.2 to 0.4	DIN 6797	100	95060A510	0000
		M2.5	2.7	5.5	0.3 to 0.5	DIN 6798	100	91120A312	0000
		M2.5	2.8	5.5	0.3 to 0.5	DIN 6797	100	95060A520	0000
		M3	3.2	6.0	0.3 to 0.5	DIN 6797	100	95060A320	0000
		M3	3.2	6.0	0.3 to 0.5	DIN 6798	100	91120A120	0000
		M3.5	3.9	7.0	0.4 to 0.6	DIN 6797	100	95060A530	0000
		M4	4.3	8.0	0.4 to 0.6	DIN 6797	100	95060A330	0000
		M4	4.3	8.0	0.4 to 0.6	DIN 6798	100	91120A130	0000
		M5	5.3	10.0	0.5 to 0.7	DIN 6797	100	95060A350	0000
		M5	5.3	10.0	0.5 to 0.7	DIN 6798	100	91120A140	0000
		M6	6.4	11.0	0.6 to 0.8	DIN 6797	100	95060A360	0000
		M6	6.4	11.0	0.6 to 0.8	DIN 6798	100	91120A160	0000
		M7	7.4	12.5	0.7 to 0.9	DIN 6797	100	95060A460	0000
		M8	8.4	15.0	0.7 to 0.9	DIN 6797	100	95060A390	0000
		M8	8.4	15.0	0.7 to 0.9	DIN 6798	100	91120A180	0000
		M10	10.5	18.0	0.8 to 1.0	DIN 6797	100	95060A400	0000
		M10	10.5	18.0	0.8 to 1.0	DIN 6798	100	91120A200	00000
		M12	13.0	20.5	0.9 to 1.2	DIN 6797	50	95060A411	0000
		M12	13.0	20.5	0.9 to 1.2	DIN 6798	50	91120A211	0000
		M14	15.0	24.0	0.9 to 1.2	DIN 6797	50	95060A420	0000
		M16	17.0	26.0	1.0 to 1.4	DIN 6798	50	91120A235	0000
		M16	17.3	26.0	1.0 to 1.4	DIN 6797	50	95060A540	00000
		M18	19.0	30.0	1.2 to 1.6	DIN 6797	10	95060A440	0000
		M20	21.0	33.0	1.2 to 1.5	DIN 6798	10	91120A241	0000
		M20	21.0	33.0	1.2 to 1.6	DIN 6797	10	95060A450	0000
		M22	23.0	36.0	1.3 to 1.7	DIN 6797	10	95060A470	0000
		M24	25.0	38.0	1.3 to 1.7	DIN 6797	10	95060A480	00000
		M24	25.0	38.0	1.4 to 1.6	DIN 6798	10	91120A245	0000
		M30	31.0	48.0	1.4 to 1.8	DIN 6797	10	95060A500	00000

		Super-Corrosion-Resistant 316 Stainless Steel


				M3	3.2	6.0	0.3 to 0.5	DIN 6797	5	90412A110	0000
				M4	4.3	8.0	0.4 to 0.6	DIN 6797	5	90412A120	0000
				M5	5.3	10.0	0.5 to 0.7	DIN 6797	5	90412A130	0000
				M6	6.4	11.0	0.6 to 0.8	DIN 6797	5	90412A140	0000
				M8	8.4	15.0	0.7 to 0.9	DIN 6797	5	90412A150	0000
				M10	10.5	18.0	0.8 to 1.0	DIN 6797	1	90412A160	0000
				M12	13.0	20.5	0.9 to 1.2	DIN 6797	1	90412A170	0000
				M14	15.0	24.0	0.9 to 1.2	DIN 6797	1	90412A180	0000
				M16	17.3	26.0	1.0 to 1.4	DIN 6797	1	90412A190	0000
				M20	21.0	33.0	1.2 to 1.6	DIN 6797	1	90412A200	0000

				Zinc-Plated Steel


						M2	2.3	4.5	0.2 to 0.4	DIN 6797	100	97985A111	0000
						M2.5	2.8	5.5	0.3 to 0.5	DIN 6797	100	97985A112	0000
						M3	3.2	6.0	0.3 to 0.5	DIN 6797	100	97985A520	0000
						M3	3.2	6.0	0.4 to 0.5	DIN 6798	100	97985A720	0000
						M3.5	3.9	7.0	0.9 to 1.2	DIN 6797	100	97985A211	0000
						M4	4.3	8.0	0.4 to 0.6	DIN 6797	100	97985A530	0000
						M4	4.3	8.0	0.5 to 0.6	DIN 6798	100	97985A730	0000
						M5	5.3	10.0	0.5 to 0.7	DIN 6797	100	97985A550	0000
						M5	5.3	10.0	0.6 to 0.7	DIN 6798	100	97985A740	0000
						M6	6.4	11.0	0.6 to 0.8	DIN 6797	100	97985A560	0000
						M6	6.4	11.0	0.7 to 0.8	DIN 6798	100	97985A760	0000
						M7	7.4	12.5	0.7 to 0.9	DIN 6797	25	97985A113	0000
						M8	8.4	15.0	0.7 to 0.9	DIN 6797	100	97985A590	0000
						M8	8.4	15.0	0.8 to 0.9	DIN 6798	100	97985A780	0000
M10						10.5	18.0	0.8 to 1.0	DIN 6797	50	97985A600	0000
M10	10.5					18.0	0.9 to 1.0	DIN 6798	50	97985A800	0000
M12	13.0					20.5	0.9 to 1.2	DIN 6797	25	97985A611	0000
M12	13.0					20.5	1.0 to 1.2	DIN 6798	50	97985A810	0000
M14	15.0					24.0	0.9 to 1.2	DIN 6797	25	97985A620	0000
M16	17.3					26.0	1.0 to 1.4	DIN 6797	25	97985A630	0000
M18	19.0					30.0	1.2 to 1.6	DIN 6797	5	97985A640	0000
M20	21.0					33.0	1.2 to 1.6	DIN 6797	5	97985A650	0000
M22	23.0					36.0	1.3 to 1.7	DIN 6797	5	97985A114	0000
M24	25.0					38.0	1.3 to 1.7	DIN 6797	5	97985A660	0000
M30	31.0					48.0	1.4 to 1.8	DIN 6797	5	97985A116	0000

Internal Tooth

Internal teeth dig into the nut or screw to prevent it from backing out. Unlike external-tooth lock washers, these have a smooth outside edge, so they are less likely to mar your material or snag on objects. However, they don’t grip quite as well. Pair them with fasteners that have small diameters, such as fillister and cheese head screws.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel


	M2	2.2	4.5	0.2 to 0.4	DIN 6797	100	93925A210	00000
	M2.3	2.5	5.0	0.2 to 0.4	DIN 6797	100	93925A411	0000
	M2.5	2.7	5.5	0.2 to 0.5	DIN 6797	100	93925A220	0000
	M3	3.2	6.0	0.3 to 0.5	DIN 6797	100	93925A240	0000
	M3.5	3.7	7.0	0.4 to 0.6	DIN 6797	100	93925A221	0000
	M4	4.3	8.0	0.4 to 0.6	DIN 6797	100	93925A250	0000
	M5	5.3	10.0	0.5 to 0.7	DIN 6797	100	93925A260	0000
	M6	6.4	11.0	0.6 to 0.8	DIN 6797	100	93925A270	0000
	M7	7.4	12.5	0.7 to 0.9	DIN 6797	50	93925A412	00000
	M8	8.4	15.0	0.7 to 0.9	DIN 6797	100	93925A280	0000
	M10	10.5	18.0	0.8 to 1.0	DIN 6797	50	93925A290	0000
	M12	13.0	20.5	0.9 to 1.2	DIN 6797	50	93925A300	0000
	M14	15.0	24.0	0.9 to 1.2	DIN 6797	25	93925A310	0000
	M16	17.0	26.0	1.0 to 1.4	DIN 6797	25	93925A320	0000
	M18	19.0	30.0	1.2 to 1.5	DIN 6797	10	93925A330	0000
	M20	21.0	33.0	1.2 to 1.5	DIN 6797	10	93925A340	0000
	M22	23.0	36.0	1.3 to 1.6	DIN 6797	10	93925A413	0000
	M24	25.0	38.0	1.3 to 1.6	DIN 6797	10	93925A414	00000

	Zinc-Plated Steel


			M2	2.2	4.5	0.2 to 0.4	DIN 6797	100	93925A415	0000
			M2.5	2.7	5.5	0.2 to 0.5	DIN 6797	100	93925A416	0000
			M3	3.2	6.0	0.3 to 0.5	DIN 6797	100	93925A417	0000
			M3.5	3.7	7.0	0.4 to 0.6	DIN 6797	100	93925A418	0000
			M4	4.3	8.0	0.4 to 0.6	DIN 6797	100	93925A419	0000
			M5	5.3	10.0	0.5 to 0.7	DIN 6797	100	93925A420	0000
			M6	6.4	11.0	0.6 to 0.8	DIN 6797	100	93925A421	0000
			M7	7.4	12.5	0.7 to 0.9	DIN 6797	100	93925A422	0000
			M8	8.4	15.0	0.7 to 0.9	DIN 6797	100	93925A423	0000
			M10	10.5	18.0	0.8 to 1.0	DIN 6797	50	93925A424	0000
			M12	13.0	20.5	0.9 to 1.2	DIN 6797	50	93925A425	00000
			M14	15.0	24.0	0.9 to 1.2	DIN 6797	25	93925A426	0000
			M16	17.0	26.0	1.0 to 1.4	DIN 6797	25	93925A427	0000
			M18	19.0	30.0	1.2 to 1.5	DIN 6797	10	93925A428	0000
			M20	21.0	33.0	1.2 to 1.5	DIN 6797	10	93925A429	00000
			M24	25.0	38.0	1.3 to 1.6	DIN 6797	10	93925A430	00000

			Black-Oxide Steel


					M2	2.2	4.5	0.2 to 0.4	DIN 6797	100	91106A120	0000
					M2.5	2.7	5.5	0.2 to 0.5	DIN 6797	100	91106A150	0000
					M2.6	2.8	5.5	0.3 to 0.5	DIN 6797	100	91106A121	0000
					M3	3.2	6.0	0.3 to 0.5	DIN 6797	100	91106A122	0000
					M3.5	3.7	7.0	0.4 to 0.6	DIN 6797	100	91106A123	0000
					M4	4.3	8.0	0.4 to 0.6	DIN 6797	100	91106A124	0000
					M5	5.3	10.0	0.5 to 0.7	DIN 6797	100	91106A126	0000
					M6	6.4	11.0	0.6 to 0.8	DIN 6797	100	91106A128	0000
					M8	8.4	15.0	0.7 to 0.9	DIN 6797	100	91106A131	0000
					M10	10.5	18.0	0.8 to 1.0	DIN 6797	50	91106A133	0000
					M12	13.0	20.5	0.9 to 1.2	DIN 6797	50	91106A135	0000
					M14	15.0	24.0	0.9 to 1.2	DIN 6797	25	91106A137	0000
					M16	17.0	26.0	1.0 to 1.4	DIN 6797	25	91106A139	0000
					M18	19.0	30.0	1.2 to 1.5	DIN 6797	10	91106A142	0000
					M20	21.0	33.0	1.2 to 1.5	DIN 6797	10	91106A146	00000

Internal and External Tooth

The strongest hold of all our tooth lock washers, these combine internal and external teeth to boost gripping power. However, the teeth may mar your material and snag on objects. Pair these washers with fasteners that are large enough to make contact with the external teeth, such as pan, button, and binding head screws.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

	ID, mm	OD, mm	Thk., mm	Pkg. Qty.		Pkg.
Zinc-Plated Steel


	M3	3.2	12.0	1.4 to 1.7	50	95795A111	000000
	M4	4.3	15.0	1.9 to 2.3	50	95795A112	00000
	M4	4.3	18.0	2.2 to 2.6	25	95795A113	0000
	M5	5.3	18.0	2.2 to 2.6	25	95795A114	00000
	M6	6.5	18.0	2.2 to 2.6	25	95795A115	00000
	M8	8.5	22.0	2.7 to 3.3	25	95795A116	00000
	M10	10.5	26.0	2.7 to 3.3	10	95795A117	00000
	M12	12.5	30.0	3.2 to 4.0	10	95795A118	00000
	M16	16.5	35.0	3.8 to 4.6	5	95795A119	00000

Countersunk Tooth Lock Washers

These washers grip flat- and oval-head countersunk screws, so you get a secure hold without overtightening. They resist loosening in applications with constant motion, such as conveyors. Tooth lock washers typically can't be reused because the teeth often get bent when tightened.

External Tooth

Teeth on the outside edge bite into both the screw head and the mating surface to lock the assembly in place.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

DIN 6798—Best for slightly bumpy or irregular surfaces because the teeth are angled to make even contact with the material.

	ID, mm	OD, mm	Thk., mm	Countersink Angle	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel


	M3	3.2	6.0	0.2 to 0.3	90°	DIN 6798	100	4340N111	000000
	M4	4.3	8.0	0.2 to 0.3	90°	DIN 6798	100	4340N112	00000
	M5	5.3	9.8	0.3 to 0.4	90°	DIN 6798	50	4340N113	00000
	M6	6.4	11.8	0.4 to 0.5	90°	DIN 6798	50	4340N114	0000
	M8	8.4	15.3	0.4 to 0.5	90°	DIN 6798	50	4340N115	00000
	M10	10.5	19.0	0.5 to 0.6	90°	DIN 6798	25	4340N116	0000
	M12	13.0	23.0	0.5 to 0.6	90°	DIN 6798	25	4340N117	00000

Wave Spring Lock Washers

The wavy shape flexes like a spring to keep nuts and screws secure on slightly uneven surfaces. These washers add a small amount of tension to stop fasteners from backing out due to mild vibration. While they don't hold as well as other lock washers, they do grip slightly better than curved washers. They work best in electrical panels, light fixtures, and other light duty assemblies. Since these washers hold their shape when untightened, you can reuse them a handful of times without losing strength.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

DIN 128B—These washers have split ends that bite into your material surface for a tighter hold than other wave washers.

	No. of Waves	ID, mm	OD, mm	Thk., mm	Overall Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel


	M4	1	4.4	7.6	0.7	1.4	DIN 128B	50	97093A174	000000
	M5	1	5.4	9.2	0.9	1.7	DIN 128B	25	97093A175	0000
	M6	1	6.5	11.8	1.2	2.2	DIN 128B	25	97093A176	0000
	M8	1	8.5	14.8	1.5	2.7	DIN 128B	25	97093A177	0000
	M10	1	10.7	18.1	1.7	3.1	DIN 128B	25	97093A178	00000
	M12	1	12.7	21.1	1.9	3.6	DIN 128B	10	97093A179	0000
	M16	1	17.0	27.4	2.6	5.1	DIN 128B	1	97093A182	0000

	Zinc-Plated Steel


			M3	1	3.1	6.2	0.6	1.1	DIN 128B	100	97093A155	0000
			M4	1	4.1	7.6	0.7	1.2	DIN 128B	100	97093A156	0000
			M5	1	5.1	9.2	0.9	1.5	DIN 128B	100	97093A157	0000
			M6	1	6.1	11.8	1.2	2.0	DIN 128B	100	97093A158	00000
			M8	1	8.1	14.8	1.5	2.5	DIN 128B	100	97093A159	00000
			M10	1	10.2	18.1	1.7	2.9	DIN 128B	50	97093A161	00000
			M12	1	12.2	21.1	2.0	3.4	DIN 128B	25	97093A162	0000
			M14	1	14.2	24.1	2.4	3.9	DIN 128B	25	97093A163	00000
			M16	1	16.2	27.4	2.7	4.5	DIN 128B	25	97093A164	00000
			M18	1	18.2	29.4	2.7	4.5	DIN 128B	10	97093A165	0000
			M22	1	22.5	35.9	3.0	5.1	DIN 128B	5	97093A167	0000
			M24	1	24.5	40.0	3.8	6.5	DIN 128B	5	97093A168	00000

Curved Spring Lock Washers

The curvy, spring-like shape adds a small amount of tension to prevent nuts and screws from backing out due to mild vibration. These washers also flex slightly to compensate for uneven surfaces. While more secure than a standard flat washer, these have the least amount of gripping power of all our lock washers. They are best suited for electrical panels, light fixtures, and other light duty assemblies. These washers hold their shape when untightened, so you can reuse them a handful of times without losing strength.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

Zinc-Yellow-Chromate-Plated Steel—With the same corrosion resistance as zinc-plated steel, these withstand occasional exposure to moisture.

Steel—Best for dry environments since moisture will cause these washers to rust.

DIN 128A—These washers have split ends that bite into your material surface for a tighter hold than other curved washers.

	ID, mm	OD, mm	Thk., mm	Overall Ht., mm	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel


	M2.5	2.6	5.1	0.5	0.9	DIN 128A	100	97093A138	00000
	M3	3.1	6.2	0.6	1.1	DIN 128A	100	97093A139	0000
	M4	4.1	7.6	0.7	1.2	DIN 128A	100	97093A141	0000
	M5	5.1	9.2	0.9	1.5	DIN 128A	100	97093A142	00000
	M6	6.1	11.8	1.2	2.0	DIN 128A	100	97093A143	00000
	M8	8.1	14.8	1.5	2.5	DIN 128A	50	97093A144	0000
	M10	10.2	18.1	1.7	2.9	DIN 128A	50	97093A145	00000
	M12	12.2	21.1	2.0	3.4	DIN 128A	50	97093A146	00000
	M14	14.2	24.1	2.3	3.9	DIN 128A	25	97093A147	00000
	M16	16.2	27.4	2.7	4.5	DIN 128A	20	97093A148	00000
	M18	18.2	29.4	2.7	4.5	DIN 128A	10	97093A149	00000
	M20	20.2	33.6	3.0	5.1	DIN 128A	10	97093A151	00000
	M22	22.5	35.9	3.0	5.1	DIN 128A	5	97093A152	00000
	M24	24.5	40.0	3.8	6.5	DIN 128A	5	97093A153	00000

	Zinc-Plated Steel


			M2.5	2.6	5.1	0.5	0.9	DIN 128A	100	97093A122	00000
			M3	3.1	6.2	0.6	1.1	DIN 128A	100	97093A123	0000
			M4	4.1	7.6	0.7	1.2	DIN 128A	100	97093A124	0000
			M5	5.1	9.2	0.9	1.5	DIN 128A	100	97093A125	0000
			M6	6.1	11.8	1.2	2.0	DIN 128A	100	97093A126	00000
			M8	8.1	14.8	1.5	2.5	DIN 128A	100	97093A127	00000
			M10	10.2	18.1	1.7	2.9	DIN 128A	100	97093A128	00000
			M12	12.2	21.1	2.0	3.4	DIN 128A	50	97093A129	00000
			M14	14.2	24.1	2.3	3.9	DIN 128A	25	97093A131	00000
			M16	16.2	27.4	2.7	4.5	DIN 128A	25	97093A132	00000
			M18	18.2	29.4	2.7	4.5	DIN 128A	10	97093A133	0000
			M20	20.2	33.6	3.0	5.1	DIN 128A	10	97093A134	00000
			M22	22.5	35.9	3.0	5.1	DIN 128A	10	97093A135	00000
			M24	24.5	40.0	3.8	6.5	DIN 128A	10	97093A136	00000
			M30	30.5	48.2	5.8	9.5	DIN 128A	1	97093A137	0000

			Zinc-Yellow-Chromate-Plated Steel


					M3	3.1	6.2	0.6	1.1	DIN 128A	100	96982A136	0000
					M3.5	3.6	6.7	0.6	1.1	DIN 128A	100	96982A137	0000
					M4	4.1	7.6	0.7	1.2	DIN 128A	100	96982A138	0000
					M5	5.1	9.2	0.9	1.5	DIN 128A	100	96982A139	0000
					M6	6.1	11.8	1.2	2	DIN 128A	100	96982A141	0000
					M8	8.1	14.8	1.5	2.5	DIN 128A	100	96982A142	0000
					M10	10.2	18.1	1.7	2.9	DIN 128A	100	96982A143	00000
					M12	12.2	21.1	2.0	3.4	DIN 128A	50	96982A144	0000
					M14	14.2	24.1	2.3	3.9	DIN 128A	25	96982A145	00000
					M16	16.2	27.4	2.7	4.5	DIN 128A	10	96982A146	00000
					M20	20.2	33.6	3.0	5.1	DIN 128A	10	96982A147	00000

					Black-Oxide Steel


							M3	3.1	6.2	0.6	1.1	DIN 128A	100	97093A111	0000
							M4	4.1	7.6	0.7	1.2	DIN 128A	100	97093A112	0000
							M5	5.1	9.2	0.9	1.5	DIN 128A	100	97093A113	0000
							M6	6.1	11.8	1.2	2.0	DIN 128A	50	97093A114	0000
							M8	8.1	14.8	1.5	2.5	DIN 128A	50	97093A115	0000
							M10	10.2	18.1	1.7	2.9	DIN 128A	25	97093A116	00000
							M12	12.2	21.1	2.0	3.4	DIN 128A	10	97093A117	0000
							M16	16.2	27.4	2.7	4.5	DIN 128A	10	97093A118	0000
							M20	20.2	33.6	3.0	5.1	DIN 128A	5	97093A119	0000
							M24	24.5	40.0	3.8	6.5	DIN 128A	5	97093A121	00000

Steel


							M2.5	2.3	4.6	0.6	1.1	DIN 6905	200	91169A311	0000
							M3	2.7	5.6	0.7	1.3	DIN 6905	200	91169A312	0000
							M4	3.6	7.0	0.8	1.4	DIN 6905	200	91169A314	00000
							M5	4.6	8.6	1.0	1.7	DIN 6905	100	91169A315	00000
							M6	5.5	11.0	1.3	2.2	DIN 6905	50	91169A316	00000
							M8	7.4	14.0	1.6	2.8	DIN 6905	50	91169A317	00000
							M10	9.3	17.0	1.8	3.2	DIN 6905	10	91169A318	00000
							M12	11.0	19.7	2.1	3.7	DIN 6905	10	91169A319	00000

Tab Lock Washers

1 Tab

Instead of relying on friction, these washers lock mechanically for more holding power than split and tooth lock washers. Bend the tabs with a wrench to stop both the fastener and washer from rotating. They are often used in applications with moderate vibration, such as motors, mixers, and pumps. These washers are not reusable because the tabs will weaken if you bend them repeatedly.

1 Tab—Bend the tab down over the edge of your mounting surface, and bend the side of the washer up against the nut or screw.

	ID, mm	OD, mm	Thk., mm	No. of Tabs	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel


	M4	4.3	14.0	0.4	1	DIN 93	100	97471A141	000000
	M5	5.3	17.0	0.5	1	DIN 93	50	97471A142	00000
	M6	6.4	19.0	0.5	1	DIN 93	50	97471A143	00000
	M8	8.4	22.0	0.8	1	DIN 93	25	97471A144	00000
	M10	10.5	26.0	0.8	1	DIN 93	25	97471A145	00000
	M12	13.0	30.0	1.0	1	DIN 93	10	97471A146	0000