McMaster-Carr

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	For Screw Size For Screw Size

M10

M12

	ID ID

	OD OD

	Washer Type Washer Type


Metal Bonded	Flat

	Material Material

	Minimum Thickness Minimum Thickness

	Maximum Thickness Maximum Thickness

	Seal Material Seal Material

Buna-N Rubber

Silicone Rubber

	Seal Color Seal Color

	Black
	Red

	Hardness Hardness

Rockwell B80

Rockwell C26

Not Rated

	Seal Hardness Seal Hardness

Durometer 50A

Durometer 85A

	Maximum Pressure for Gases Maximum Pressure for Gases

100 psi

200 psi

	Maximum Pressure for Fluids Maximum Pressure for Fluids

	Minimum Temperature Minimum Temperature

-100° F

-30° F

	Maximum Temperature Maximum Temperature

220° F

400° F

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68 Products

About Washers

Able to withstand pressure greater than 7,000 psi, these one-piece bonded washers create the tightest seals. They are zinc-plated steel for corrosion resistance in wet environments. The Buna-N rubber seal has excellent abrasion resistance and good oil, weather, and chemical resistance. Washers are reusable.

For technical drawings and 3-D models, click on a part number.

				Max. Pressure, psi		Temperature Range, °F
For Screw Size	ID, mm	OD, mm	Thick., mm	For Fluids	For Gases	Min.	Max.	Hardness	Seal Hardness	Seal Color	Pkg. Qty.		Pkg.
Zinc-Plated Steel with Buna-N Rubber Seal
M5	4.8	9.8	0.9-1.2	15,200	200	-30°	220°	Rockwell C26	Durometer 85A	Black	5	000000000	00000
M6	5.8	11.3	1.1-1.4	12,800	200	-30°	220°	Rockwell C26	Durometer 85A	Black	5	000000000	0000
M8	7.8	13.5	1.1-1.4	7,900	200	-30°	220°	Rockwell C26	Durometer 85A	Black	5	000000000	0000
M10	9.7	15.3	1.1-1.4	7,200	200	-30°	220°	Rockwell C26	Durometer 85A	Black	5	000000000	0000
M12	11.7	19.3	1.1-1.4	7,100	200	-30°	220°	Rockwell C26	Durometer 85A	Black	5	000000000	0000
M14	13.7	22.4	1.1-1.4	8,000	200	-30°	220°	Rockwell C26	Durometer 85A	Black	5	000000000	0000
M16	15.7	27.1	1.1-1.4	12,500	200	-30°	220°	Rockwell C26	Durometer 85A	Black	5	000000000	0000

Pressure-Rated Metal-Bonded Sealing Washers

These washers are rated to withstand pressure up to 100 psi. They are one-piece rubber-to-metal bonded washers that create a stronger seal than metal or rubber alone. Made of 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. The silicone seal has excellent weather resistance. Washers are reusable.

For technical drawings and 3-D models, click on a part number.

Metric

				Max. Pressure, psi		Temperature Range, °F
For Screw Size	ID, mm	OD, mm	Thick., mm	For Fluids	For Gases	Min.	Max.	Hardness	Seal Hardness	Seal Color		Each
18-8 Stainless Steel with Silicone Rubber Seal
M3	2.9	14	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	00000
M3	2.9	25.4	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000
M4	3.9	14	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000
M4	3.9	25.4	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000
M5	4.9	14	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000
M5	4.9	19.1	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000
M5	4.9	25.4	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000
M6	5.9	19.1	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000
M6	5.9	25.4	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000
M8	7.8	19.1	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000
M8	7.8	25.4	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000
M10	9.8	25.4	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000
M12	11.8	25.4	2-2.1	100	100	-100°	400°	Rockwell B80	Durometer 50A	Red	000000000	0000

Metal Sealing Washers

Also known as crush washers, these compress when tightened to form a tighter, more durable seal than rubber washers. They are commonly used to seal fluids such as oil and fuel. Washers are not reusable.

Copper washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

Aluminum washers are lightweight and corrosion resistant in wet environments.

For technical drawings and 3-D models, click on a part number.

Copper
For Screw Size	ID, mm	OD, mm	Thick., mm	Specifications Met	Pkg. Qty.		Pkg.
M5	5.2	10.4	0.8-1.2	DIN 7603	25	000000000	00000
M6	6.2	9.9	0.8-1.2	DIN 7603	25	000000000	00000
M6	6.2	11.9	0.8-1.2	DIN 7603	50	000000000	00000
M6	6.2	12.4	1.3-1.7	DIN 7603	25	000000000	0000
M8	8.2	11.9	0.8-1.2	DIN 7603	50	000000000	00000
M8	8.2	12.4	1.3-1.7	DIN 7603	25	000000000	00000
M8	8.2	13.9	0.8-1.2	DIN 7603	50	000000000	00000
M10	10.2	13.9	0.8-1.2	DIN 7603	25	000000000	0000
M10	10.2	15.9	1.3-1.7	DIN 7603	25	000000000	00000
M12	12.2	15.9	1.3-1.7	DIN 7603	25	000000000	00000
M12	12.2	16.2	0.8-1.2	DIN 7603	25	000000000	00000
M12	12.2	17.9	1.3-1.7	DIN 7603	25	000000000	00000
M14	14.2	17.9	0.8-1.2	DIN 7603	10	000000000	00000
M14	14.2	17.9	1.3-1.7	DIN 7603	10	000000000	00000
M14	14.2	19.9	1.3-1.7	DIN 7603	10	000000000	00000
M16	16.2	19.9	1.3-1.7	DIN 7603	10	000000000	00000
M16	16.2	21.9	1.3-1.7	DIN 7603	10	000000000	00000
M16	16.2	21.9	1.8-2.2	DIN 7603	10	000000000	00000
M18	18.2	23.9	1.3-1.7	DIN 7603	10	000000000	00000
M20	20.2	25.9	1.3-1.7	DIN 7603	5	000000000	0000
M22	22.2	26.9	1.3-1.7	DIN 7603	10	000000000	00000
M22	22.2	28.9	1.3-1.7	DIN 7603	10	000000000	00000
M24	24.3	29.9	1.8-2.2	DIN 7603	5	000000000	0000
M26	26.3	31.9	1.8-2.2	DIN 7603	5	000000000	0000
M28	28.3	35.9	1.3-1.7	DIN 7603	5	000000000	00000
M30	30.3	35.9	1.8-2.2	DIN 7603	5	000000000	00000
M32	32.3	37.9	1.8-2.2	DIN 7603	5	000000000	00000
M36	36.3	41.9	1.8-2.2	DIN 7603	5	000000000	00000
M36	36.3	43.9	1.8-2.2	DIN 7603	1	000000000	00000
M38	38.3	43.9	1.8-2.2	DIN 7603	1	000000000	00000
M42	42.3	48.9	1.8-2.2	DIN 7603	1	000000000	00000
M48	48.3	54.9	1.8-2.2	DIN 7603	1	000000000	00000
Aluminum
M6	6.2	9.9	0.8-1.2	DIN 7603	50	000000000	00000
M6	6.2	11.9	0.8-1.2	DIN 7603	50	000000000	00000
M8	8.2	11.9	0.8-1.2	DIN 7603	50	000000000	00000
M10	10.2	13.9	0.8-1.2	DIN 7603	50	000000000	00000
M10	10.2	15.9	0.8-1.2	DIN 7603	50	000000000	00000
M12	12.2	15.9	1.3-1.7	DIN 7603	50	000000000	00000
M12	12.2	17.9	1.3-1.7	DIN 7603	50	000000000	00000
M14	14.2	17.9	1.3-1.7	DIN 7603	25	000000000	00000
M14	14.2	19.9	1.3-1.7	DIN 7603	25	000000000	00000
M16	16.2	19.9	1.3-1.7	DIN 7603	25	000000000	00000
M16	16.2	21.9	1.3-1.7	DIN 7603	10	000000000	0000
M18	18.2	23.9	1.3-1.7	DIN 7603	10	000000000	00000
M20	20.2	25.9	1.3-1.7	DIN 7603	10	000000000	00000
M22	22.2	26.9	1.3-1.7	DIN 7603	10	000000000	00000
M24	24.3	29.9	1.8-2.2	DIN 7603	10	000000000	00000
M26	26.3	31.9	1.8-2.2	DIN 7603	10	000000000	00000

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About Washers

Metric High-Pressure-RatedMetal-Bonded Sealing Washers

Pressure-Rated Metal-Bonded Sealing Washers

Metal Sealing Washers

Metric High-Pressure-Rated
Metal-Bonded Sealing Washers