ASME B18.3.4M Screws | McMaster-Carr

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49 Products

Performance

Tamper Resistant

Prevent unauthorized access

34 products

Corrosion Resistant

Stay strong when exposed to moisture, chemicals, and harsh weather

3 products

Performance

High Strength

Bear the burden of heavy loads and high stress without breaking

46 products

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Torx

A six-lobe opening prevents drivers from slipping

3 products

Steel Button Head Torx Plus Screws

Our strongest Torx Plus rounded head screws. Made of alloy steel, they have nearly twice the tensile strength of other screws. The button head looks similar to a pan head, but it's lower and more compact, taking up less space. With larger lobes than Torx drives, Torx Plus withstands even more torque without the driver slipping and stripping the drive.

Length is measured from under the head.

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

		Head, mm
	Lg., mm	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







				M3 × 0.5 mm

				6	5.7	1.65	Fully Threaded	110,000	ASME B18.3.4M	100	96452A711	000000


				8	5.7	1.65	Fully Threaded	110,000	ASME B18.3.4M	100	96452A712	00000
				10	5.7	1.65	Fully Threaded	110,000	ASME B18.3.4M	100	96452A713	00000




						M4 × 0.7 mm

						8	7.6	2.2	Fully Threaded	110,000	ASME B18.3.4M	100	96452A714	00000


						10	7.6	2.2	Fully Threaded	110,000	ASME B18.3.4M	100	96452A715	00000
						12	7.6	2.2	Fully Threaded	110,000	ASME B18.3.4M	100	96452A716	00000




								M5 × 0.8 mm

								10	9.5	2.75	Fully Threaded	110,000	ASME B18.3.4M	100	96452A717	00000


								12	9.5	2.75	Fully Threaded	110,000	ASME B18.3.4M	100	96452A718	00000
								16	9.5	2.75	Fully Threaded	110,000	ASME B18.3.4M	100	96452A719	00000




										M6 × 1 mm

										12	10.5	3.3	Fully Threaded	110,000	ASME B18.3.4M	100	96452A721	00000


										16	10.5	3.3	Fully Threaded	110,000	ASME B18.3.4M	100	96452A722	00000
										20	10.5	3.3	Fully Threaded	110,000	ASME B18.3.4M	100	96452A723	00000

Stainless Steel Button Head Torx Screws

Our most corrosion-resistant button head Torx screws. The button head looks similar to a pan head, but it's lower and more compact, taking up less space. With a deep six-lobe opening, the Torx drive prevents your driver from slipping and stripping the drive. Also known as star drives, they withstand more torque than slotted, Phillips, and hex drives.

Length is measured from under the head.

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

		Head, mm
	Lg., mm	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				M4.5 × 0.75 mm

				8	8.54	2.48	Fully Threaded	100,000	ASME B18.3.4M	50	90910A960	000000


				10	8.54	2.48	Fully Threaded	100,000	ASME B18.3.4M	50	90910A961	00000
				12	8.54	2.48	Fully Threaded	100,000	ASME B18.3.4M	50	90910A962	00000

Tamper-Resistant Torx Steel Button Head Screws

Our strongest Torx screws for deterring unauthorized access. With a security pin in the drive, you can only turn them with a tamper-resistant Torx driver. Also known as pin-in Torx, the drive has a deep six-lobe opening that withstands high torque without the driver slipping and stripping the drive. Made of alloy steel, they have nearly twice the tensile strength of other screws. The button head looks similar to a pan head, but it's lower and more compact, taking up less space.

Length is measured from under the head.

L-Keys—Turn screws by hand for more control and less chance of overtightening compared to power tools.

Power Tool Bits—Pair these bits with your power tools to turn screws more quickly than manual tools.

	Screws									L-Keys		Power Tool Bits
		Head, mm
	Lg., mm	Dia.	Ht.	Threading	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.		Each		Each
Black-Oxide Alloy Steel







				M3 × 0.5 mm

				6	5.7	1.65	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A111	000000	55525A23	00000	7233A61	00000


				8	5.7	1.65	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A112	00000	55525A23	0000	7233A61	0000
				10	5.7	1.65	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A113	00000	55525A23	0000	7233A61	0000




						M4 × 0.7 mm

						6	7.6	2.2	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A114	00000	55525A26	0000	7233A64	0000


						8	7.6	2.2	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A115	00000	55525A26	0000	7233A64	0000
						10	7.6	2.2	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A116	00000	55525A26	0000	7233A64	0000
						12	7.6	2.2	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A117	00000	55525A26	0000	7233A64	0000
						16	7.6	2.2	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A511	00000	55525A26	0000	7233A64	0000
						20	7.6	2.2	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A512	00000	55525A26	0000	7233A64	0000




								M5 × 0.8 mm

								8	9.5	2.75	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A118	00000	55525A28	0000	7233A66	0000


								10	9.5	2.75	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A119	00000	55525A28	0000	7233A66	0000
								12	9.5	2.75	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	50	90388A121	00000	55525A28	0000	7233A66	0000
								16	9.5	2.75	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	25	90388A122	0000	55525A28	0000	7233A66	0000
								25	9.5	2.75	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	25	90388A513	00000	55525A28	0000	7233A66	0000




										M6 × 1 mm

										10	10.5	3.3	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	25	90388A123	00000	55525A29	0000	7233A67	0000


										12	10.5	3.3	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	25	90388A124	00000	55525A29	0000	7233A67	0000
										16	10.5	3.3	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	25	90388A125	00000	55525A29	0000	7233A67	0000
										20	10.5	3.3	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	25	90388A126	00000	55525A29	0000	7233A67	0000
										25	10.5	3.3	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	10	90388A514	0000	55525A29	0000	7233A67	0000
										30	10.5	3.3	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	10	90388A515	0000	55525A29	0000	7233A67	0000
										40	10.5	3.3	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	10	90388A516	0000	55525A29	0000	7233A67	0000
										50	10.5	3.3	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	10	90388A517	0000	55525A29	0000	7233A67	0000




												M8 × 1.25 mm

												16	14	4.4	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	25	90388A127	00000	55525A32	0000	7233A71	0000


20	14											4.4	Fully Threaded	130,000	ASME B18.3.4M, ISO 7380	10	90388A128	0000	55525A32	0000	7233A71	0000