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	000000000	00000


			3/16"	0.035"	Not Rated	Fed. Spec. QQ-P-35	MS51021-2	000000000	0000
			1/4"	0.035"	Not Rated	Fed. Spec. QQ-P-35	MS51021-3	000000000	0000




					4-40

					1/8"	0.050"	Not Rated	Fed. Spec. QQ-P-35	MS51021-9	000000000	0000


					3/16"	0.050"	Not Rated	Fed. Spec. QQ-P-35	MS51021-10	000000000	0000
					1/4"	0.050"	Not Rated	Fed. Spec. QQ-P-35	MS51021-11	000000000	0000
					3/8"	0.050"	Not Rated	Fed. Spec. QQ-P-35	MS51021-13	000000000	0000
					1/2"	0.050"	Not Rated	Fed. Spec. QQ-P-35	MS51021-15	000000000	0000




							6-32

							1/8"	1/16"	Not Rated	Fed. Spec. QQ-P-35	MS51021-21	000000000	0000


							3/16"	1/16"	Not Rated	Fed. Spec. QQ-P-35	MS51021-22	000000000	0000
							1/4"	1/16"	Not Rated	Fed. Spec. QQ-P-35	MS51021-23	000000000	0000
							3/8"	1/16"	Not Rated	Fed. Spec. QQ-P-35	MS51021-25	000000000	0000




									8-32

									3/16"	5/64"	Not Rated	Fed. Spec. QQ-P-35	MS51021-31	000000000	0000


									1/4"	5/64"	Not Rated	Fed. Spec. QQ-P-35	MS51021-32	000000000	0000
									3/8"	5/64"	Not Rated	Fed. Spec. QQ-P-35	MS51021-34	000000000	0000
									1/2"	5/64"	Not Rated	Fed. Spec. QQ-P-35	MS51021-36	000000000	0000




											10-32

											3/16"	3/32"	Not Rated	Fed. Spec. QQ-P-35	MS51023-48	000000000	0000


											1/4"	3/32"	Not Rated	Fed. Spec. QQ-P-35	MS51023-49	000000000	0000
											3/8"	3/32"	Not Rated	Fed. Spec. QQ-P-35	MS51023-51	000000000	0000
											1/2"	3/32"	Not Rated	Fed. Spec. QQ-P-35	MS51023-52	000000000	0000




											1/4"-28

	3/16"										1/8"	Not Rated	Fed. Spec. QQ-P-35	MS51023-60	000000000	0000


	1/4"	1/8"									Not Rated	Fed. Spec. QQ-P-35	MS51023-61	000000000	0000
	5/16"	1/8"									Not Rated	Fed. Spec. QQ-P-35	MS51023-62	000000000	0000
	3/8"	1/8"									Not Rated	Fed. Spec. QQ-P-35	MS51023-63	000000000	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	000000000	00000


			3/16"	0.035"	Rockwell C45	MS51963-2	000000000	0000
			1/4"	0.035"	Rockwell C45	MS51963-3	000000000	0000




					4-40

					1/8"	0.050"	Rockwell C45	MS51963-9	000000000	0000


					3/16"	0.050"	Rockwell C45	MS51963-10	000000000	0000
					1/4"	0.050"	Rockwell C45	MS51963-11	000000000	0000
					1/2"	0.050"	Rockwell C45	MS51963-15	000000000	0000




							6-32

							1/8"	1/16"	Rockwell C45	MS51963-20	000000000	0000


							3/16"	1/16"	Rockwell C45	MS51963-21	000000000	0000
							1/4"	1/16"	Rockwell C45	MS51963-22	000000000	0000
							3/8"	1/16"	Rockwell C45	MS51963-24	000000000	0000




									8-32

									1/8"	5/64"	Rockwell C45	MS51963-33	000000000	0000


									3/16"	5/64"	Rockwell C45	MS51963-34	000000000	0000
									1/4"	5/64"	Rockwell C45	MS51963-35	000000000	0000
									3/8"	5/64"	Rockwell C45	MS51963-37	000000000	0000
									1/2"	5/64"	Rockwell C45	MS51963-39	000000000	0000




											10-32

											3/16"	3/32"	Rockwell C45	MS51964-48	000000000	0000


											1/4"	3/32"	Rockwell C45	MS51964-49	000000000	0000
											3/8"	3/32"	Rockwell C45	MS51964-51	000000000	0000
											1/2"	3/32"	Rockwell C45	MS51964-53	000000000	0000




											1/4"-20

	1/4"										1/8"	Rockwell C45	MS51963-63	000000000	0000


	3/8"	1/8"									Rockwell C45	MS51963-65	000000000	0000
	1/2"	1/8"									Rockwell C45	MS51963-67	000000000	0000




											1/4"-28

			1/4"								1/8"	Rockwell C45	MS51964-64	000000000	0000


			5/16"	1/8"							Rockwell C45	MS51964-65	000000000	0000
			3/8"	1/8"							Rockwell C45	MS51964-66	000000000	0000
			1/2"	1/8"							Rockwell C45	MS51964-68	000000000	0000