Mil. Spec. Set Screws | McMaster-Carr

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51 Products

Stainless Steel Cup-Tip Set Screws

These corrosion-resistant cup-tip screws grip parts tightly. Made of stainless steel, they won't rust, but they're not as strong as alloy steel. The tip has thin edges that dig into surfaces for a secure hold. They often lock gears, pulleys, and other transmission components onto shafts.

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.

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

	Drive Size	Hardness	Specs. Met	Mil. Spec.		Each
18-8 Stainless Steel







			2-56

			1/8"	0.035"	Not Rated	Fed. Spec. QQ-P-35	MS51021-1	97705A139	00000


			3/16"	0.035"	Not Rated	Fed. Spec. QQ-P-35	MS51021-2	97705A142	0000
			1/4"	0.035"	Not Rated	Fed. Spec. QQ-P-35	MS51021-3	97705A145	0000




					4-40

					1/8"	0.050"	Not Rated	Fed. Spec. QQ-P-35	MS51021-9	97705A226	0000


					3/16"	0.050"	Not Rated	Fed. Spec. QQ-P-35	MS51021-10	97705A228	0000
					1/4"	0.050"	Not Rated	Fed. Spec. QQ-P-35	MS51021-11	97705A234	0000
					3/8"	0.050"	Not Rated	Fed. Spec. QQ-P-35	MS51021-13	97705A242	0000
					1/2"	0.050"	Not Rated	Fed. Spec. QQ-P-35	MS51021-15	97705A246	0000




							6-32

							1/8"	1/16"	Not Rated	Fed. Spec. QQ-P-35	MS51021-21	97705A265	0000


							3/16"	1/16"	Not Rated	Fed. Spec. QQ-P-35	MS51021-22	97705A269	0000
							1/4"	1/16"	Not Rated	Fed. Spec. QQ-P-35	MS51021-23	97705A274	0000
							3/8"	1/16"	Not Rated	Fed. Spec. QQ-P-35	MS51021-25	97705A282	0000




									8-32

									3/16"	5/64"	Not Rated	Fed. Spec. QQ-P-35	MS51021-31	97705A401	0000


									1/4"	5/64"	Not Rated	Fed. Spec. QQ-P-35	MS51021-32	97705A406	0000
									3/8"	5/64"	Not Rated	Fed. Spec. QQ-P-35	MS51021-34	97705A412	0000
									1/2"	5/64"	Not Rated	Fed. Spec. QQ-P-35	MS51021-36	97705A415	0000




											10-32

											3/16"	3/32"	Not Rated	Fed. Spec. QQ-P-35	MS51023-48	97705A474	0000


											1/4"	3/32"	Not Rated	Fed. Spec. QQ-P-35	MS51023-49	97705A479	0000
											3/8"	3/32"	Not Rated	Fed. Spec. QQ-P-35	MS51023-51	97705A485	0000
											1/2"	3/32"	Not Rated	Fed. Spec. QQ-P-35	MS51023-52	97705A488	0000




											1/4"-28

	3/16"										1/8"	Not Rated	Fed. Spec. QQ-P-35	MS51023-60	97705A647	0000


	1/4"	1/8"									Not Rated	Fed. Spec. QQ-P-35	MS51023-61	97705A650	0000
	5/16"	1/8"									Not Rated	Fed. Spec. QQ-P-35	MS51023-62	97705A656	0000
	3/8"	1/8"									Not Rated	Fed. Spec. QQ-P-35	MS51023-63	97705A661	0000

Steel Cup-Tip Set Screws

Made of alloy steel, these screws are strong enough to hold components without wearing down. The tip has thin edges that dig into surfaces for a secure hold. They often lock gears, pulleys, and other transmission components onto shafts.

Cadmium-Plated Alloy Steel—The plating reduces friction between the screw and your mounting surface to prevent sticking when tightening and loosening. It also creates a barrier against rust.

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

	Drive Size	Hardness	Mil. Spec.		Each
Cadmium-Plated Alloy Steel







			2-56

			1/8"	0.035"	Rockwell C45	MS51963-1	98637A016	00000


			3/16"	0.035"	Rockwell C45	MS51963-2	98637A019	0000
			1/4"	0.035"	Rockwell C45	MS51963-3	98637A022	0000




					4-40

					1/8"	0.050"	Rockwell C45	MS51963-9	98637A103	0000


					3/16"	0.050"	Rockwell C45	MS51963-10	98637A105	0000
					1/4"	0.050"	Rockwell C45	MS51963-11	98637A111	0000
					1/2"	0.050"	Rockwell C45	MS51963-15	98637A123	0000




							6-32

							1/8"	1/16"	Rockwell C45	MS51963-20	98637A142	0000


							3/16"	1/16"	Rockwell C45	MS51963-21	98637A146	0000
							1/4"	1/16"	Rockwell C45	MS51963-22	98637A151	0000
							3/8"	1/16"	Rockwell C45	MS51963-24	98637A155	0000




									8-32

									1/8"	5/64"	Rockwell C45	MS51963-33	98637A278	0000


									3/16"	5/64"	Rockwell C45	MS51963-34	98637A283	0000
									1/4"	5/64"	Rockwell C45	MS51963-35	98637A286	0000
									3/8"	5/64"	Rockwell C45	MS51963-37	98637A289	0000
									1/2"	5/64"	Rockwell C45	MS51963-39	98637A292	0000




											10-32

											3/16"	3/32"	Rockwell C45	MS51964-48	98637A351	0000


											1/4"	3/32"	Rockwell C45	MS51964-49	98637A356	0000
											3/8"	3/32"	Rockwell C45	MS51964-51	98637A365	0000
											1/2"	3/32"	Rockwell C45	MS51964-53	98637A368	0000




											1/4"-20

	1/4"										1/8"	Rockwell C45	MS51963-63	98637A401	0000


	3/8"	1/8"									Rockwell C45	MS51963-65	98637A410	0000
	1/2"	1/8"									Rockwell C45	MS51963-67	98637A416	0000




											1/4"-28

			1/4"								1/8"	Rockwell C45	MS51964-64	98637A527	0000


			5/16"	1/8"							Rockwell C45	MS51964-65	98637A533	0000
			3/8"	1/8"							Rockwell C45	MS51964-66	98637A538	0000
			1/2"	1/8"							Rockwell C45	MS51964-68	98637A542	0000