MS 51959 Machine Screws | McMaster-Carr

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Mil. Spec. Stainless Steel Phillips Flat Head Screws

Manufactured and tested to meet strict U.S. military specifications for material and construction. These screws are made of stainless steel, so they won't rust or corrode when exposed to moisture and chemicals. The Phillips drive has 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.

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.

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.

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







				2-56

				1/8"	82°	Undercut	0.172"	0.036"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-1	50	96877A110	00000


				3/16"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-2	100	96877A115	00000
				1/4"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-3	100	96877A118	00000
				5/16"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-4	100	96877A121	00000
				3/8"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-5	100	96877A123	00000
				7/16"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-6	50	96877A117	0000
				1/2"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-7	100	96877A134	00000
				5/8"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-8	50	96877A138	00000
				3/4"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-9	50	96877A146	00000
				7/8"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-10	25	96877A147	0000




						4-40

						3/16"	82°	Undercut	0.225"	0.047"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-12	50	96877A198	0000


						1/4"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-13	100	96877A200	00000
						5/16"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-14	100	96877A205	00000
						3/8"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-15	100	96877A209	00000
						7/16"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-16	50	96877A199	00000
						1/2"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-17	50	96877A216	0000
						5/8"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-18	50	96877A222	00000
						3/4"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-19	50	96877A224	00000
						7/8"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-20	50	96877A711	00000
						1"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-21	50	96877A625	00000
						1 1/4"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-22	50	96877A712	00000


						1 1/2"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-23	25	96877A713	0000




								6-32

								3/16"	82°	Undercut	0.279"	0.059"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-25	25	96877A301	0000


								1/4"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-26	50	96877A305	0000
								5/16"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-27	50	96877A310	00000
								3/8"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-28	50	96877A315	00000
								7/16"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-29	50	96877A304	0000
								1/2"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-30	50	96877A320	00000
								5/8"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-31	50	96877A323	00000
								3/4"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-32	50	96877A330	00000
								7/8"	82°	Standard	0.279"	0.081"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-33	50	96877A714	00000
								1"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-34	25	96877A626	00000
								1 1/4"	82°	Standard	0.279"	0.081"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-35	25	96877A715	00000


1 1/2"								82°	Standard	0.279"	0.081"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-36	25	96877A716	00000
1 3/4"	82°							Standard	0.279"	0.081"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-37	25	96877A717	00000




		8-32

		1/4"	82°					Undercut	0.332"	0.07"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-41	50	96877A398	00000


		5/16"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-42	50	96877A401	00000
		3/8"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-43	50	96877A405	00000
		7/16"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-44	50	96877A408	00000
		1/2"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-45	50	96877A411	00000
		5/8"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-46	50	96877A413	00000
		3/4"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-47	25	96877A418	00000
		7/8"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-48	25	96877A719	00000
		1"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-49	25	96877A627	00000
		1 1/4"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-50	25	96877A628	00000
		1 1/2"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-51	25	96877A629	00000


		1 3/4"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-52	10	96877A721	0000
		2"	82°	Standard				0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-53	10	96877A722	0000
		2 1/4"	82°	Standard	0.332"			0.1"	Partially Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-54	10	96877A723	00000
		2 1/2"	82°	Standard	0.332"			0.1"	Partially Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-55	10	96877A724	00000




				10-24

				3/8"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-61	25	96877A500	00000


				7/16"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-62	25	96877A725	00000
				1/2"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-63	25	96877A510	00000
				5/8"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-64	25	96877A515	00000
				3/4"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-65	25	96877A520	00000
				7/8"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-66	25	96877A726	00000
				1"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-67	25	96877A631	00000




								1/4"-20

						3/8"	82°	Undercut	0.507"	0.107"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-77	10	96877A727	00000


						7/16"	82°	Undercut	0.507"	0.107"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-78	10	96877A728	00000
						1/2"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-79	10	96877A615	0000
						5/8"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-80	10	96877A617	00000
						3/4"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-81	10	96877A619	00000
						7/8"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-82	10	96877A102	00000
						1"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-83	10	96877A624	00000
						1 1/4"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-84	10	96877A634	0000
						1 1/2"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-85	10	96877A635	00000
						1 3/4"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-86	5	96877A729	0000
						2"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-87	5	96877A731	00000


						2 1/2"	82°	Standard	0.507"	0.153"	Partially Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-89	5	96877A732	00000




3/8"-16

1"	82°							Standard	0.762"	0.23"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-111	5	96877A636	00000


1 1/4"	82°							Standard	0.762"	0.23"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-112	5	96877A637	00000
1 1/2"	82°							Standard	0.762"	0.23"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS51959-113	5	96877A638	0000