Bumax Fasteners | McMaster-Carr

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Bumax 88 Stainless Steel

Bumax 109 Stainless Steel

System of Measurement

Thread Size

Length

Threading

Thread Pitch

Specifications Met

Head Width

Screw Size

Performance

Highly Corrosion Resistant

Head Height

DFARS Specialty Metals

Thread Type

Height

Hardness

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Width

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

RoHS

Compliant

Export Control Classification Number (ECCN)

REACH

Thickness

Washer Designation

Thread Length

65 Products

About Hex Head Screws and Bolts

Choose a hex head fastener with the right threading, thread size, material, and strength for your equipment.

Stainless Steel Hex Head Screws


Fully Threaded	Partially Threaded

Won't rust or corrode when exposed to moisture and chemicals. These screws have a head with six flat sides to keep wrenches and sockets from slipping and rounding off the drive.

Length is measured from under the head.

Highly Corrosion-Resistant High-Strength Bumax 88 Stainless Steel—Comparable in strength to Grade 5 steel and as corrosion resistant as 316 stainless steel. These screws are commonly used in demanding applications, such as marine environments and chemical processing.

		Head					Imported
	Lg.	Wd.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Pkg. Qty.		Pkg.
Highly Corrosion-Resistant High-Strength Bumax 88 Stainless Steel







				1/4"-20

				1/2"	7/16"	5/32"	Fully Threaded	Coarse	110,000	5	93810A110	000000


				3/4"	7/16"	5/32"	Fully Threaded	Coarse	110,000	5	93810A120	0000
				1"	7/16"	5/32"	Partially Threaded	Coarse	110,000	5	93810A130	00000
				1 1/4"	7/16"	5/32"	Partially Threaded	Coarse	110,000	5	93810A140	00000
				1 1/2"	7/16"	5/32"	Partially Threaded	Coarse	110,000	5	93810A150	00000
				2"	7/16"	5/32"	Partially Threaded	Coarse	110,000	5	93810A160	00000




						5/16"-18

						3/4"	1/2"	13/64"	Fully Threaded	Coarse	110,000	5	93810A210	00000


						1"	1/2"	13/64"	Fully Threaded	Coarse	110,000	5	93810A220	00000
						1 1/4"	1/2"	13/64"	Partially Threaded	Coarse	110,000	1	93810A230	0000
						1 1/2"	1/2"	13/64"	Partially Threaded	Coarse	110,000	1	93810A240	0000




								3/8"-16

								3/4"	9/16"	15/64"	Fully Threaded	Coarse	110,000	1	93810A410	0000


								1"	9/16"	15/64"	Fully Threaded	Coarse	110,000	1	93810A420	0000
								1 1/2"	9/16"	15/64"	Partially Threaded	Coarse	110,000	1	93810A430	0000
								1 3/4"	9/16"	15/64"	Partially Threaded	Coarse	110,000	1	93810A440	0000
								2"	9/16"	15/64"	Partially Threaded	Coarse	110,000	1	93810A450	0000
								2 1/2"	9/16"	15/64"	Partially Threaded	Coarse	110,000	1	93810A460	0000
								3"	9/16"	15/64"	Partially Threaded	Coarse	110,000	1	93810A470	00000




										1/2"-13

										1"	3/4"	5/16"	Fully Threaded	Coarse	110,000	1	93810A550	0000


										1 1/4"	3/4"	5/16"	Fully Threaded	Coarse	110,000	1	93810A560	00000
										1 1/2"	3/4"	5/16"	Fully Threaded	Coarse	110,000	1	93810A570	00000
										1 3/4"	3/4"	5/16"	Partially Threaded	Coarse	110,000	1	93810A580	00000
										2"	3/4"	5/16"	Partially Threaded	Coarse	110,000	1	93810A590	00000
										2 1/2"	3/4"	5/16"	Partially Threaded	Coarse	110,000	1	93810A610	00000
										3"	3/4"	5/16"	Partially Threaded	Coarse	110,000	1	93810A620	00000
										3 1/2"	3/4"	5/16"	Partially Threaded	Coarse	110,000	1	93810A630	00000
										4"	3/4"	5/16"	Partially Threaded	Coarse	110,000	1	93810A640	00000




	M6 × 1 mm

	10 mm										10 mm	4 mm	Fully Threaded	Coarse	110,000	10	93810A310	00000


	12 mm	10 mm									4 mm	Fully Threaded	Coarse	110,000	10	93810A317	00000
	16 mm	10 mm	4 mm								Fully Threaded	Coarse	110,000	10	93810A324	00000
	20 mm	10 mm	4 mm								Fully Threaded	Coarse	110,000	10	93810A331	00000
	25 mm	10 mm	4 mm								Fully Threaded	Coarse	110,000	10	93810A338	00000
	30 mm	10 mm	4 mm								Fully Threaded	Coarse	110,000	10	93810A345	00000
	40 mm	10 mm	4 mm								Fully Threaded	Coarse	110,000	5	93810A352	00000




			M8 × 1.25 mm

			16 mm								13 mm	5.3 mm	Fully Threaded	Coarse	110,000	5	93810A461	00000


			20 mm	13 mm							5.3 mm	Fully Threaded	Coarse	110,000	5	93810A467	00000
			25 mm	13 mm	5.3 mm						Fully Threaded	Coarse	110,000	5	93810A473	00000
			30 mm	13 mm	5.3 mm						Fully Threaded	Coarse	110,000	5	93810A479	00000
			35 mm	13 mm	5.3 mm						Fully Threaded	Coarse	110,000	5	93810A485	00000
			40 mm	13 mm	5.3 mm						Fully Threaded	Coarse	110,000	5	93810A491	00000
			50 mm	13 mm	5.3 mm						Fully Threaded	Coarse	110,000	1	93810A497	0000




					M10 × 1.5 mm

					25 mm						16 mm	6.4 mm	Fully Threaded	Coarse	110,000	1	93810A523	0000


					30 mm	16 mm	6.4 mm				Fully Threaded	Coarse	110,000	1	93810A531	0000
					35 mm	16 mm	6.4 mm				Fully Threaded	Coarse	110,000	1	93810A539	0000
					40 mm	16 mm	6.4 mm				Fully Threaded	Coarse	110,000	1	93810A547	0000
					50 mm	16 mm	6.4 mm				Fully Threaded	Coarse	110,000	1	93810A556	0000




							M12 × 1.75 mm

							30 mm				18 mm	7.5 mm	Fully Threaded	Coarse	110,000	1	93810A602	0000


							35 mm				18 mm	7.5 mm	Fully Threaded	Coarse	110,000	1	93810A607	0000
							40 mm	18 mm			7.5 mm	Fully Threaded	Coarse	110,000	1	93810A612	00000
							50 mm	18 mm	7.5 mm		Fully Threaded	Coarse	110,000	1	93810A617	00000

Hex Nuts

The most commonly used hex nuts, these are suitable for fastening most machinery and equipment.

Corrosion-Resistant Stainless Steel

Highly Corrosion-Resistant High-Strength Bumax 88 Stainless Steel—Comparable in strength to Grade 5 steel and as corrosion resistant as 316 stainless steel. These nuts are commonly used in demanding environments, such as marine and chemical processing applications.

	Wd.	Ht.	Specs. Met	Pkg. Qty.		Pkg.
Highly Corrosion-Resistant High-Strength Bumax 88 Stainless Steel



	5/16"-18	1/2"	15/64"	—	1	96621A530	00000


	3/8"-16	9/16"	21/64"	—	1	96621A540	0000
	1/2"-13	3/4"	7/16"	—	1	96621A550	00000
	5/8"-11	1"	33/64"	—	1	96621A560	00000
	M6 × 1 mm	10 mm	5.2 mm	ISO 4032	10	96621A110	0000
	M8 × 1.25 mm	13 mm	6.8 mm	ISO 4032	5	96621A220	0000
	M10 × 1.5 mm	16 mm	8.4 mm	ISO 4032	1	96621A330	0000
	M12 × 1.75 mm	18 mm	10.8 mm	ISO 4032	1	96621A440	0000
	M16 × 2 mm	24 mm	14.8 mm	ISO 4032	1	96621A510	0000
	M20 × 2.5 mm	30 mm	18 mm	ISO 4032	1	96621A520	00000

General Purpose Washers

Your go-to metal washer for every screw size. Washers take the pressure off nuts and screws to protect mounting surfaces.

Stainless Steel About Stainless Steel

Highly Corrosion-Resistant High-Strength Bumax 109 Stainless Steel—As strong as 17-7 PH stainless steel and as corrosion resistant as 316 stainless steel. These washers are commonly used in demanding environments, such as marine and chemical processing applications.

	ID, mm	OD, mm	Thk., mm	Pkg. Qty.		Pkg.
Highly Corrosion-Resistant High-Strength Bumax 109 Stainless Steel



	M6	6.4	12.0	1.4 to 1.8	10	94316A310	00000


	M8	8.4	16.0	1.4 to 1.8	10	94316A320	0000
	M10	10.5	20.0	1.8 to 2.2	5	94316A330	0000
	M12	13.0	24.0	2.3 to 2.7	5	94316A340	00000

Oversized Washers

Cover oversized holes or use these washers as spacers and levelers. Compared to general purpose washers, these have a larger diameter or thickness.

Stainless Steel About Stainless Steel

Image of Product. Front orientation. Contains Annotated. Washers. Oversized Washers.

Image of Specification. Front orientation. Washers. Oversized Washers.

Highly Corrosion-Resistant High-Strength Bumax 88 Stainless Steel—As strong as medium-strength Class 8.8 steel and as corrosion resistant as 316 stainless steel. These washers are commonly used in demanding environments, such as marine and chemical processing applications.

	ID, mm	OD, mm	Thk., mm	Specs. Met	Pkg. Qty.		Pkg.
Highly Corrosion-Resistant High-Strength Bumax 88 Stainless Steel



	M10	10.5	30.0	2.3 to 2.7	DIN 9021, ISO 7093-1	1	94316A530	00000


	Highly Corrosion-Resistant High-Strength Bumax 109 Stainless Steel



			M6	6.4	18.0	1.4 to 1.8	DIN 9021, ISO 7093-1	10	94316A560	00000