NASM35190 Screws | McMaster-Carr

One of the most common drive styles. Phillips drives have a cross-shaped opening in which a driver fits snugly for easy alignment. With four contact points, they withstand more torque than slotted drives, but drivers slip when you apply too much force.

Length is measured from the top of the head.

Cadmium-Plated Steel—The plating reduces friction between the screw and your mounting surface to prevent sticking when you tighten or loosen them. It also creates a barrier against rust.

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

Undercut Profile—About a third thinner than standard heads, the undercut profile fits into shallow holes in thin material. The thin head also has more threading on the shaft, so they're often used to keep short screws from coming loose.

Military Specification—These screws are manufactured and tested to meet strict U.S. military standards for material and construction.

				Head
	Lg.	Countersink Angle	Flat Head Profile	Dia.	Ht.	Threading	Tensile Strength, psi	Mil. Spec.	Pkg. Qty.		Pkg.
Cadmium-Plated Steel







				4-40

				3/16"	82°	Undercut	0.225"	0.047"	Fully Threaded	60,000	MS35190-220, NASM35190	100	91321A111	000000


				1/4"	82°	Standard	0.225"	0.067"	Fully Threaded	60,000	MS35190-221, NASM35190	100	91321A112	00000
				3/8"	82°	Standard	0.225"	0.067"	Fully Threaded	60,000	MS35190-223, NASM35190	100	91321A113	00000
				1/2"	82°	Standard	0.225"	0.067"	Fully Threaded	60,000	MS35190-225, NASM35190	100	91321A114	00000




						6-32

						1/4"	82°	Standard	0.279"	0.083"	Fully Threaded	60,000	MS35190-234, NASM35190	100	91321A115	00000


						3/8"	82°	Standard	0.279"	0.083"	Fully Threaded	60,000	MS35190-236, NASM35190	100	91321A116	00000
						1/2"	82°	Standard	0.279"	0.083"	Fully Threaded	60,000	MS35190-238, NASM35190	100	91321A117	00000
						3/4"	82°	Standard	0.279"	0.083"	Fully Threaded	60,000	MS35190-240, NASM35190	100	91321A118	00000




								8-32

								1/4"	82°	Undercut	0.332"	0.07"	Fully Threaded	60,000	MS35190-249, NASM35190	100	91321A119	00000


								3/8"	82°	Standard	0.332"	0.1"	Fully Threaded	60,000	MS35190-251, NASM35190	100	91321A121	00000
								1/2"	82°	Standard	0.332"	0.1"	Fully Threaded	60,000	MS35190-253, NASM35190	100	91321A122	00000
								3/4"	82°	Standard	0.332"	0.1"	Fully Threaded	60,000	MS35190-255, NASM35190	100	91321A123	00000




										1/4"-20

										1/2"	82°	Standard	0.507"	0.153"	Fully Threaded	60,000	MS35190-287, NASM35190	25	91321A128	00000


										3/4"	82°	Standard	0.507"	0.153"	Fully Threaded	60,000	MS35190-289, NASM35190	25	91321A129	00000
										1"	82°	Standard	0.507"	0.153"	Fully Threaded	60,000	MS35190-291, NASM35190	25	91321A131	00000
										1 1/2"	82°	Standard	0.507"	0.153"	Fully Threaded	60,000	MS35190-293, NASM35190	25	91321A132	00000