NAS 1351 Cap Screws | McMaster-Carr

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Specifications Met

System of Measurement

Thread Size

Length

Material

Fastener Head Type

Threading

Tensile Strength

30,000 psi to 99,999 psi

100,000 psi or greater

Socket Head Profile

Drive Style

Finish

Certification

Military Specification

DFARS Specialty Metals

Compliant

Not Compliant

Thread Fit

Unified Standard Class 3A

Thread Spacing

Head Diameter

RoHS

Thread Type

Head Height

Hardness

Thread Direction

Drive Size

Export Control Classification Number (ECCN)

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

REACH

88 Products

Performance

High Strength

Bear the burden of heavy loads and high stress without breaking

62 products

Corrosion Resistant

Resist moisture, chemicals, and harsh weather

68 products

Performance

Chemical Resistant

Won’t degrade when exposed to most chemicals

42 products

High Temperature

Won't degrade when exposed to high heat

42 products

Steel Socket Head Screws

Fully Threaded

Partially Threaded

Made of alloy steel, these screws are the standard for high-strength fastening. Use them in high-load applications such as dies, presses, and heavy equipment. The deep, six-point socket keeps the hex key from slipping out and damaging the drive.

Length is measured from under the head.

Cadmium-Plated Alloy 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.

Military Specification—Manufactured and tested to meet strict U.S. military standards for material and construction.

		Head
	Lg.	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Mil. Spec.	Specs. Met		Each
Cadmium-Plated Alloy Steel







				10-32

				3/8"	5/16"	0.19"	Fully Threaded	Fine	160,000	MS16998-26	NAS1351-3-6P	92562A130	00000


				1/2"	5/16"	0.19"	Fully Threaded	Fine	160,000	MS16998-27	NAS1351-3-8P	92562A416	0000
				5/8"	5/16"	0.19"	Fully Threaded	Fine	160,000	MS16998-28	NAS1351-3-10P	92562A131	0000
				3/4"	5/16"	0.19"	Fully Threaded	Fine	160,000	MS16998-29	NAS1351-3-12P	92562A428	0000
				7/8"	5/16"	0.19"	Fully Threaded	Fine	160,000	MS16998-30	NAS1351-3-14P	92562A132	0000
				1"	5/16"	0.19"	Fully Threaded	Fine	160,000	MS16998-31	NAS1351-3-16P	92562A434	0000
				1 1/4"	5/16"	0.19"	Partially Threaded	Fine	160,000	MS16998-32	NAS1351-3-20P	92562A133	0000
				1 1/2"	5/16"	0.19"	Partially Threaded	Fine	160,000	MS16998-33	NAS1351-3-24P	92562A134	0000
				1 3/4"	5/16"	0.19"	Partially Threaded	Fine	160,000	MS16998-34	NAS1351-3-28P	92562A135	0000
				2"	5/16"	0.19"	Partially Threaded	Fine	160,000	MS16998-35	NAS1351-3-32P	92562A136	0000




						1/4"-28

						1/2"	3/8"	1/4"	Fully Threaded	Fine	160,000	MS16998-41	NAS1351-4-8P	92562A141	0000


						5/8"	3/8"	1/4"	Fully Threaded	Fine	160,000	MS16998-42	NAS1351-4-10P	92562A142	0000
						3/4"	3/8"	1/4"	Fully Threaded	Fine	160,000	MS16998-43	NAS1351-4-12P	92562A588	0000
						7/8"	3/8"	1/4"	Fully Threaded	Fine	160,000	MS16998-44	NAS1351-4-14P	92562A143	0000
						1"	3/8"	1/4"	Fully Threaded	Fine	160,000	MS16998-45	NAS1351-4-16P	92562A596	0000
						1 1/4"	3/8"	1/4"	Fully Threaded	Fine	160,000	MS16998-46	NAS1351-4-20P	92562A144	0000
						1 1/2"	3/8"	1/4"	Partially Threaded	Fine	160,000	MS16998-47	NAS1351-4-24P	92562A605	0000
						1 3/4"	3/8"	1/4"	Partially Threaded	Fine	160,000	MS16998-48	NAS1351-4-28P	92562A612	0000
						2"	3/8"	1/4"	Partially Threaded	Fine	160,000	MS16998-49	NAS1351-4-32P	92562A145	0000
						2 1/4"	3/8"	1/4"	Partially Threaded	Fine	160,000	MS16998-50	NAS1351-4-36P	92562A146	0000

Stainless Steel Socket Head Screws

Fully Threaded

Partially Threaded

These screws won't rust or corrode when exposed to moisture and chemicals. Their deep, six-point socket keeps hex keys from slipping out and damaging the drive.

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 screws can.

High-Temperature High-Strength A286 Stainless Steel—Often used to fasten parts in engines and turbines, these are our strongest stainless steel screws. They withstand higher temperatures than 18-8 stainless steel screws and resist corrosion from chemicals, such as bleach and chlorine. However, they won't hold up to salt water as well as 316 stainless steel screws.

Military Specification—Manufactured and tested to meet strict U.S. military standards for material and construction.

		Head
	Lg.	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Mil. Spec.	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				0-80

				1/8"	0.096"	0.06"	Fully Threaded	Fine	80,000	MS16996-1	Fed. Spec. FF-S-86, NAS1351C00-2, NASM16996	10	92200A052	00000


				3/16"	0.096"	0.06"	Fully Threaded	Fine	80,000	MS16996-2	Fed. Spec. FF-S-86, NAS1351C00-3, NASM16996	10	92200A054	0000
				1/4"	0.096"	0.06"	Fully Threaded	Fine	80,000	MS16996-3	Fed. Spec. FF-S-86, NAS1351C00-4, NASM16996	10	92200A055	0000
				3/8"	0.096"	0.06"	Fully Threaded	Fine	80,000	MS16996-4	Fed. Spec. FF-S-86, NAS1351C00-6, NASM16996	10	92200A057	0000




						10-32

						3/8"	5/16"	0.19"	Fully Threaded	Fine	80,000	MS16996-9	Fed. Spec. FF-S-86, NAS1351C3-6, NASM16996	10	92200A340	0000


						1/2"	5/16"	0.19"	Fully Threaded	Fine	80,000	MS16996-10	Fed. Spec. FF-S-86, NAS1351C3-8, NASM16996	10	92200A342	0000
						5/8"	5/16"	0.19"	Fully Threaded	Fine	80,000	MS16996-11	Fed. Spec. FF-S-86, NAS1351C3-10, NASM16996	10	92200A344	0000
						3/4"	5/16"	0.19"	Fully Threaded	Fine	80,000	MS16996-12	Fed. Spec. FF-S-86, NAS1351C3-12, NASM16996	10	92200A345	0000
						7/8"	5/16"	0.19"	Fully Threaded	Fine	80,000	MS16996-13	Fed. Spec. FF-S-86, NAS1351C3-14, NASM16996	10	92200A346	0000
						1"	5/16"	0.19"	Fully Threaded	Fine	80,000	MS16996-14	Fed. Spec. FF-S-86, NAS1351C3-16, NASM16996	10	92200A347	0000
						1 1/4"	5/16"	0.19"	Partially Threaded	Fine	80,000	MS16996-15	Fed. Spec. FF-S-86, NAS1351C3-20, NASM16996	10	92200A349	0000
						1 1/2"	5/16"	0.19"	Partially Threaded	Fine	80,000	MS16996-16	Fed. Spec. FF-S-86, NAS1351C3-24, NASM16996	10	92200A351	0000




								1/4"-28

								1/2"	3/8"	1/4"	Fully Threaded	Fine	80,000	MS16996-21	Fed. Spec. FF-S-86, NAS1351C4-8, NASM16996	5	92200A580	00000


								5/8"	3/8"	1/4"	Fully Threaded	Fine	80,000	MS16996-22	Fed. Spec. FF-S-86, NAS1351C4-10, NASM16996	5	92200A582	00000
								3/4"	3/8"	1/4"	Fully Threaded	Fine	80,000	MS16996-23	Fed. Spec. FF-S-86, NAS1351C4-12, NASM16996	5	92200A584	00000
								1"	3/8"	1/4"	Fully Threaded	Fine	80,000	MS16996-24	Fed. Spec. FF-S-86, NAS1351C4-16, NASM16996	5	92200A586	00000
								1 1/4"	3/8"	1/4"	Fully Threaded	Fine	80,000	MS16996-25	Fed. Spec. FF-S-86, NAS1351C4-20, NASM16996	5	92200A588	00000
								1 1/2"	3/8"	1/4"	Partially Threaded	Fine	80,000	MS16996-26	Fed. Spec. FF-S-86, NAS1351C4-24, NASM16996	5	92200A590	00000




										5/16"-24

										3/4"	15/32"	5/16"	Fully Threaded	Fine	80,000	MS16996-31	Fed. Spec. FF-S-86, NAS1351C5-12, NASM16996	1	92200A651	0000


										1"	15/32"	5/16"	Fully Threaded	Fine	80,000	MS16996-32	Fed. Spec. FF-S-86, NAS1351C5-16, NASM16996	1	92200A653	0000
										1 1/4"	15/32"	5/16"	Fully Threaded	Fine	80,000	MS16996-33	Fed. Spec. FF-S-86, NAS1351C5-20, NASM16996	1	92200A655	0000
										1 1/2"	15/32"	5/16"	Fully Threaded	Fine	80,000	MS16996-34	Fed. Spec. FF-S-86, NAS1351C5-24, NASM16996	1	92200A657	0000




												3/8"-24

												3/4"	9/16"	3/8"	Fully Threaded	Fine	80,000	MS16996-39	Fed. Spec. FF-S-86, NAS1351C6-12, NASM16996	1	92200A704	0000


1"	9/16"											3/8"	Fully Threaded	Fine	80,000	MS16996-40	Fed. Spec. FF-S-86, NAS1351C6-16, NASM16996	1	92200A706	0000
1 1/4"	9/16"											3/8"	Fully Threaded	Fine	80,000	MS16996-41	Fed. Spec. FF-S-86, NAS1351C6-20, NASM16996	1	92200A708	00000
1 1/2"	9/16"											3/8"	Fully Threaded	Fine	80,000	MS16996-42	Fed. Spec. FF-S-86, NAS1351C6-24, NASM16996	1	92200A709	0000


High-Temperature High-Strength A286 Stainless Steel







												0-80

												1/8"	0.096"	0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-2, SAE AMS5737	1	92423A101	0000


				1/8"	0.096"							0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-2, SAE AMS5737	100	92423A201	000000
				3/16"	0.096"							0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-3, SAE AMS5737	1	92423A102	0000
				3/16"	0.096"							0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-3, SAE AMS5737	100	92423A202	000000
				1/4"	0.096"							0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-4, SAE AMS5737	1	92423A103	0000
				1/4"	0.096"							0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-4, SAE AMS5737	100	92423A203	000000
				5/16"	0.096"							0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-5, SAE AMS5737	1	92423A104	0000
				5/16"	0.096"							0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-5, SAE AMS5737	100	92423A204	000000
				3/8"	0.096"							0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-6, SAE AMS5737	1	92423A105	0000
				3/8"	0.096"							0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-6, SAE AMS5737	100	92423A205	000000
				1/2"	0.096"							0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-8, SAE AMS5737	1	92423A106	0000


				1/2"	0.096"							0.06"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N00-8, SAE AMS5737	100	92423A206	000000




						10-32

						3/8"	5/16"					0.19"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-6, SAE AMS5737	1	92423A502	0000


						3/8"	5/16"					0.19"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-6, SAE AMS5737	100	92423A501	000000
						1/2"	5/16"					0.19"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-8, SAE AMS5737	1	92423A505	0000
						1/2"	5/16"					0.19"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-8, SAE AMS5737	100	92423A504	000000
						5/8"	5/16"					0.19"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-10, SAE AMS5737	1	92423A508	0000
						5/8"	5/16"					0.19"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-10, SAE AMS5737	100	92423A509	000000
						3/4"	5/16"					0.19"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-12, SAE AMS5737	1	92423A511	0000
						3/4"	5/16"					0.19"	Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-12, SAE AMS5737	100	92423A512	000000
						7/8"	5/16"	0.19"				Fully Threaded	Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-14, SAE AMS5737	1	92423A513	0000
						7/8"	5/16"	0.19"	Fully Threaded			Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-14, SAE AMS5737	100	92423A514	000000
						1"	5/16"	0.19"	Fully Threaded			Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-16, SAE AMS5737	1	92423A516	0000


						1"	5/16"	0.19"	Fully Threaded			Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-16, SAE AMS5737	100	92423A515	000000
						1 1/4"	5/16"	0.19"	Partially Threaded			Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-20, SAE AMS5737	1	92423A519	0000
						1 1/4"	5/16"	0.19"	Partially Threaded			Fine	160,000	—	Fed. Spec. FF-S-86, NAS1351N3-20, SAE AMS5737	25	92423A518	000000
						1 1/2"	5/16"	3/16"	Partially Threaded			Fine	160,000	—	ASME B18.3, NAS1351N3-24, SAE AMS5731, SAE AMS5737	1	92423A126	00000
						1 1/2"	5/16"	3/16"	Partially Threaded			Fine	160,000	—	ASME B18.3, NAS1351N3-24, SAE AMS5731, SAE AMS5737	25	92423A226	000000
						1 3/4"	5/16"	3/16"	Partially Threaded			Fine	160,000	—	ASME B18.3, NAS1351N3-28, SAE AMS5731, SAE AMS5737	1	92423A127	00000
						1 3/4"	5/16"	3/16"	Partially Threaded			Fine	160,000	—	ASME B18.3, NAS1351N3-28, SAE AMS5731, SAE AMS5737	25	92423A227	000000
						2"	5/16"	3/16"	Partially Threaded	Fine		160,000	—	ASME B18.3, NAS1351N3-32, SAE AMS5731, SAE AMS5737	1	92423A128	00000
						2"	5/16"	3/16"	Partially Threaded	Fine	160,000	—	ASME B18.3, NAS1351N3-32, SAE AMS5731, SAE AMS5737	25	92423A228	000000
						2 1/4"	5/16"	3/16"	Partially Threaded	Fine	160,000	—	ASME B18.3, NAS1351N3-36, SAE AMS5731, SAE AMS5737	1	92423A129	0000


						2 1/4"	5/16"	3/16"	Partially Threaded	Fine	160,000	—	ASME B18.3, NAS1351N3-36, SAE AMS5731, SAE AMS5737	25	92423A229	000000
						2 1/2"	5/16"	3/16"	Partially Threaded	Fine	160,000	—	ASME B18.3, NAS1351N3-40, SAE AMS5731, SAE AMS5737	1	92423A130	00000
						2 1/2"	5/16"	3/16"	Partially Threaded	Fine	160,000	—	ASME B18.3, NAS1351N3-40, SAE AMS5731, SAE AMS5737	25	92423A230	000000
						2 3/4"	5/16"	3/16"	Partially Threaded	Fine	160,000	—	ASME B18.3, NAS1351N3-44, SAE AMS5731, SAE AMS5737	1	92423A131	00000
						2 3/4"	5/16"	3/16"	Partially Threaded	Fine	160,000	—	ASME B18.3, NAS1351N3-44, SAE AMS5731, SAE AMS5737	25	92423A231	000000
						3"	5/16"	3/16"	Partially Threaded	Fine	160,000	—	ASME B18.3, NAS1351N3-48, SAE AMS5731, SAE AMS5737	1	92423A132	00000
3"						5/16"	3/16"	Partially Threaded	Fine	160,000	—	ASME B18.3, NAS1351N3-48, SAE AMS5731, SAE AMS5737	25	92423A232	000000
4"	5/16"					3/16"	Partially Threaded	Fine	160,000	—	ASME B18.3, NAS1351N3-64, SAE AMS5731, SAE AMS5737	1	92423A133	00000
4"	5/16"					3/16"	Partially Threaded	Fine	160,000	—	ASME B18.3, NAS1351N3-64, SAE AMS5731, SAE AMS5737	25	92423A233	000000