ASME B18.3.5M Screws | McMaster-Carr

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30 Products

Steel Torx Plus Flat Head Screws

The strongest Torx Plus flat head screws we offer. They're made of alloy steel, so they have nearly twice the tensile strength of other screws. With larger lobes than Torx drives, Torx Plus withstands even more torque without slipping and stripping the drive.

Length is measured from the top of 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.

Standard Profile—Standard-profile heads are the most common choice for flat head screws.

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







				M3 × 0.5 mm

				5	90°	Standard	6.72	1.86	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	000000


				6	90°	Standard	6.72	1.86	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000
				8	90°	Standard	6.72	1.86	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000
				10	90°	Standard	6.72	1.86	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000
				12	90°	Standard	6.72	1.86	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000




						M4 × 0.7 mm

						6	90°	Standard	8.94	2.48	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	0000


						8	90°	Standard	8.94	2.48	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000
						10	90°	Standard	8.94	2.48	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000
						12	90°	Standard	8.94	2.48	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000
						16	90°	Standard	8.94	2.48	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000




								M5 × 0.8 mm

								8	90°	Standard	11.2	3.1	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000


								10	90°	Standard	11.2	3.1	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000
								12	90°	Standard	11.2	3.1	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000
								16	90°	Standard	11.2	3.1	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000
								20	90°	Standard	11.2	3.1	Fully Threaded	140,000	ASME B18.3.5M	100	000000000	00000




										M6 × 1 mm

										12	90°	Standard	13.44	3.72	Fully Threaded	140,000	ASME B18.3.5M	50	000000000	00000


										16	90°	Standard	13.44	3.72	Fully Threaded	140,000	ASME B18.3.5M	50	000000000	00000
										20	90°	Standard	13.44	3.72	Fully Threaded	140,000	ASME B18.3.5M	50	000000000	00000
										25	90°	Standard	13.44	3.72	Fully Threaded	140,000	ASME B18.3.5M	50	000000000	00000
										30	90°	Standard	13.44	3.72	Fully Threaded	140,000	ASME B18.3.5M	50	000000000	00000

Stainless Steel Torx Plus Flat Head Screws

The most corrosion-resistant Torx Plus flat head screws we offer. Made of stainless steel, they won't rust or corrode when exposed to moisture and chemicals, but they're not as strong as alloy steel. With larger lobes than Torx drives, Torx Plus withstands even more torque without slipping and stripping the drive.

Length is measured from the top of 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.

Standard Profile—Standard-profile heads are the most common choice for flat head screws.

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







				M3 × 0.5 mm

				5	90°	Standard	6.72	1.86	Fully Threaded	80,000	ASME B18.3.5M	100	000000000	000000


				6	90°	Standard	6.72	1.86	Fully Threaded	80,000	ASME B18.3.5M	100	000000000	00000
				8	90°	Standard	6.72	1.86	Fully Threaded	80,000	ASME B18.3.5M	100	000000000	00000
				10	90°	Standard	6.72	1.86	Fully Threaded	80,000	ASME B18.3.5M	100	000000000	00000
				12	90°	Standard	6.72	1.86	Fully Threaded	80,000	ASME B18.3.5M	100	000000000	00000




						M4 × 0.7 mm

						6	90°	Standard	7.82	2.48	Fully Threaded	80,000	ASME B18.3.5M	100	000000000	00000


						8	90°	Standard	7.82	2.48	Fully Threaded	80,000	ASME B18.3.5M	100	000000000	00000
						10	90°	Standard	7.82	2.48	Fully Threaded	80,000	ASME B18.3.5M	100	000000000	00000
						12	90°	Standard	7.82	2.48	Fully Threaded	80,000	ASME B18.3.5M	100	000000000	00000
						16	90°	Standard	7.82	2.48	Fully Threaded	80,000	ASME B18.3.5M	100	000000000	00000