MS 51959 Machine Screws | McMaster-Carr

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Military Specification

System of Measurement

Thread Size

Length

Countersink Angle

Fastener Head Type

Drive Style

Material

Head Diameter

Flat Head Profile

Specifications Met

Federal Specification

SAE AMS2700

DFARS Specialty Metals

Threading

Head Height

Thread Direction

Thread Type

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Thread Fit

Unified Standard Class 2A

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72 Products

Flat Head Profile

Standard

The most common head profile for flat head screws

66 products

Undercut

About a third thinner than standard-profile heads

6 products

Certificate Type

Material Certificate

Certificates with a traceable lot number are available

7 products

Stainless Steel Phillips Flat Head Screws

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

Undercut—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	Specs. Met	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, SAE AMS2700	MS51959-1	50	000000000	00000


				3/16"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-2	100	000000000	00000
				1/4"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-3	100	000000000	00000
				5/16"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-4	100	000000000	00000
				3/8"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-5	100	000000000	00000
				7/16"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-6	50	000000000	0000
				1/2"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-7	100	000000000	00000
				5/8"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-8	50	000000000	00000
				3/4"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-9	50	000000000	00000
				7/8"	82°	Standard	0.172"	0.051"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-10	25	000000000	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, SAE AMS2700	MS51959-12	50	000000000	0000


						1/4"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-13	100	000000000	00000
						5/16"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-14	100	000000000	00000
						3/8"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-15	100	000000000	00000
						7/16"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-16	50	000000000	0000
						1/2"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-17	50	000000000	0000
						5/8"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-18	50	000000000	00000
						3/4"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-19	50	000000000	00000
						7/8"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-20	50	000000000	00000
						1"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-21	50	000000000	00000
						1 1/4"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-22	50	000000000	00000


						1 1/2"	82°	Standard	0.225"	0.067"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-23	25	000000000	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, SAE AMS2700	MS51959-25	25	000000000	0000


								1/4"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-26	50	000000000	0000
								5/16"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-27	50	000000000	00000
								3/8"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-28	50	000000000	00000
								7/16"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-29	50	000000000	0000
								1/2"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-30	50	000000000	00000
								5/8"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-31	50	000000000	00000
								3/4"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-32	50	000000000	00000
								7/8"	82°	Standard	0.279"	0.081"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-33	50	000000000	00000
								1"	82°	Standard	0.279"	0.083"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-34	25	000000000	00000
								1 1/4"	82°	Standard	0.279"	0.081"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-35	25	000000000	00000


1 1/2"								82°	Standard	0.279"	0.081"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-36	25	000000000	00000
1 3/4"	82°							Standard	0.279"	0.081"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-37	25	000000000	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, SAE AMS2700	MS51959-41	50	000000000	00000


		5/16"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-42	50	000000000	0000
		3/8"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-43	50	000000000	00000
		7/16"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-44	50	000000000	00000
		1/2"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-45	50	000000000	00000
		5/8"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-46	50	000000000	00000
		3/4"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-47	25	000000000	00000
		7/8"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-48	25	000000000	00000
		1"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-49	25	000000000	00000
		1 1/4"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-50	25	000000000	00000
		1 1/2"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-51	25	000000000	00000


		1 3/4"	82°					Standard	0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-52	10	000000000	0000
		2"	82°	Standard				0.332"	0.1"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-53	10	000000000	0000
		2 1/4"	82°	Standard	0.332"			0.1"	Partially Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-54	10	000000000	00000
		2 1/2"	82°	Standard	0.332"			0.1"	Partially Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-55	10	000000000	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, SAE AMS2700	MS51959-61	25	000000000	00000


				7/16"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-62	25	000000000	00000
				1/2"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-63	25	000000000	00000
				5/8"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-64	25	000000000	00000
				3/4"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-65	25	000000000	00000
				7/8"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-66	25	000000000	00000
				1"	82°			Standard	0.385"	0.116"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-67	25	000000000	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, SAE AMS2700	MS51959-77	10	000000000	00000


						7/16"	82°	Undercut	0.507"	0.107"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-78	10	000000000	00000
						1/2"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-79	10	000000000	0000
						5/8"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-80	10	000000000	00000
						3/4"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-81	10	000000000	00000
						7/8"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-82	10	000000000	00000
						1"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-83	10	000000000	00000
						1 1/4"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-84	10	000000000	0000
						1 1/2"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-85	10	000000000	00000
						1 3/4"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-86	5	000000000	0000
						2"	82°	Standard	0.507"	0.153"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-87	5	000000000	00000


						2 1/2"	82°	Standard	0.507"	0.153"	Partially Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-89	5	000000000	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, SAE AMS2700	MS51959-111	5	000000000	00000


1 1/4"	82°							Standard	0.762"	0.23"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-112	5	000000000	00000
1 1/2"	82°							Standard	0.762"	0.23"	Fully Threaded	70,000	Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, SAE AMS2700	MS51959-113	5	000000000	0000