Plain Steel Set Screws | McMaster-Carr

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EAR99

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Yes

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112 Products

External-Square-Drive Steel Cup-Tip Set Screws

The large, flat sides prevent sockets from slipping. With four contact points, these screws give you reliable torque but slightly less than external hex drives. The tip has thin edges that dig into surfaces for a secure hold. These screws often lock gears, pulleys, and other transmission components onto shafts.

Steel—An economical choice with good strength but not as strong as alloy steel.

		Head
	Lg.	Wd.	Ht.	Hardness	Specs. Met	Pkg. Qty.		Pkg.
Steel







				1/4"-20

				3/8"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	50	91410A535	00000


				1/2"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	50	91410A537	00000
				5/8"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	50	91410A538	00000
				3/4"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	50	91410A540	00000
				7/8"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	10	91410A741	0000
				1"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	50	91410A542	00000
				1 1/2"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	25	91410A546	0000
				1 3/4"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	10	91410A742	0000
				2"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	10	91410A550	0000
				2 1/4"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	10	91410A743	0000
				2 1/2"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	5	91410A744	0000


				2 3/4"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	5	91410A745	0000
				3"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	5	91410A746	0000
				6"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	1	91410A752	00000




						5/16"-18

						3/8"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	10	91410A753	0000


						1/2"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	50	91410A578	00000
						3/4"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	50	91410A581	00000
						1"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	50	91410A583	00000
						1 1/4"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	50	91410A585	00000
						1 1/2"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	25	91410A587	00000
						2"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	25	91410A942	00000
						2 1/2"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	5	91410A754	0000
						3"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	10	91410A943	00000
						3 1/2"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	1	91410A755	0000
						4"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	1	91410A756	0000


						6"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	1	91410A759	00000




								3/8"-16

								1/2"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	50	91410A619	00000


								3/4"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	50	91410A622	00000
								1"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	25	91410A624	00000
								1 1/4"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	25	91410A626	00000
								1 1/2"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	25	91410A628	00000
								2"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	25	91410A632	00000
								2 1/4"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	5	91410A761	0000
2 1/2"								3/8"	19/64"	Rockwell B80	ASME B18.6.2	10	91410A634	00000
2 3/4"	3/8"							19/64"	Rockwell B80	ASME B18.6.2	5	91410A762	00000
3"	3/8"							19/64"	Rockwell B80	ASME B18.6.2	10	91410A636	00000
3 1/2"	3/8"							19/64"	Rockwell B80	ASME B18.6.2	10	91410A639	00000


4"	3/8"	19/64"	Rockwell B80					ASME B18.6.2	5	91410A642	00000
4 1/2"	3/8"	19/64"	Rockwell B80					ASME B18.6.2	1	91410A645	0000
5"	3/8"	19/64"	Rockwell B80					ASME B18.6.2	1	91410A648	0000




		7/16"-14

		3/4"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	5	91410A763	0000


		1"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	10	91410A669	00000
		1 1/4"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	5	91410A765	0000
		1 1/2"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	5	91410A766	0000
		1 3/4"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	5	91410A767	0000
		2"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	5	91410A677	0000
		2 1/4"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	1	91410A768	0000
		2 1/2"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	1	91410A769	0000
		3"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	1	91410A771	0000
		4"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	1	91410A773	00000




				1/2"-13

				5/8"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	5	91410A776	0000


				3/4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	91410A710	00000
				1"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	91410A712	00000
				1 1/4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	91410A714	00000
				1 1/2"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	91410A716	00000
				2"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	91410A720	00000
				2 1/4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	91410A779	0000
				2 1/2"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	91410A722	00000
				2 3/4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	91410A781	0000
				3"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	5	91410A724	00000
				3 1/4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	91410A782	00000


				3 1/2"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	5	91410A726	00000
				4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	5	91410A728	00000
				4 1/2"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	91410A783	0000
				5"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	91410A730	0000
				6"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	91410A735	0000
				8"	1/2"	25/64"		Rockwell B80	ASME B18.6.2	1	91410A784	00000
				10"	1/2"	25/64"	Rockwell B80	ASME B18.6.2	1	91410A785	00000




						5/8"-11

						3/4"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	91410A786	0000


						1"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	91410A787	0000
						1 1/4"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	91410A788	0000
						1 1/2"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	5	91410A798	00000
						1 3/4"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	91410A789	0000
						2"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	5	91410A802	00000
						2 1/4"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	91410A791	0000
						2 1/2"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	91410A804	0000
						2 3/4"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	91410A792	0000
						3"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	91410A806	0000
						3 1/2"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	91410A808	0000


4"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	91410A810	0000
4 1/2"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	91410A793	0000
5"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	91410A814	0000
5 1/2"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	91410A794	00000
6"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	91410A818	0000
8"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	91410A795	00000
10"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	91410A796	00000




						3/4"-10

						2"	3/4"	37/64"	Rockwell B80	ASME B18.6.2	1	91410A843	0000


						2 1/2"	3/4"	37/64"	Rockwell B80	ASME B18.6.2	1	91410A845	0000
		3"				3/4"	37/64"	Rockwell B80	ASME B18.6.2	1	91410A847	0000
		3 1/2"	3/4"			37/64"	Rockwell B80	ASME B18.6.2	1	91410A849	0000
		4"	3/4"			37/64"	Rockwell B80	ASME B18.6.2	1	91410A851	0000
		5"	3/4"			37/64"	Rockwell B80	ASME B18.6.2	1	91410A855	0000
		6"	3/4"			37/64"	Rockwell B80	ASME B18.6.2	1	91410A859	00000




						7/8"-9

						2"	7/8"	21/32"	Rockwell B80	ASME B18.6.2	1	91410A951	00000


						3"	7/8"	21/32"	Rockwell B80	ASME B18.6.2	1	91410A952	00000
						4"	7/8"	43/64"	Rockwell B80	ASME B18.6.2	1	91410A711	00000
						5"	7/8"	21/32"	Rockwell B80	ASME B18.6.2	1	91410A953	00000
						6"	7/8"	43/64"	Rockwell B80	ASME B18.6.2	1	91410A896	00000
						8"	7/8"	21/32"	Rockwell B80	ASME B18.6.2	1	91410A954	00000
						12"	7/8"	21/32"	Rockwell B80	ASME B18.6.2	1	91410A956	00000




								1"-8

								2"	1"	25/32"	Rockwell B80	ASME B18.6.2	1	91410A957	00000


				3"	1"			25/32"	Rockwell B80	ASME B18.6.2	1	91410A958	00000
				4"	1"			25/32"	Rockwell B80	ASME B18.6.2	1	91410A920	00000
				5"	1"			25/32"	Rockwell B80	ASME B18.6.2	1	91410A926	00000
				6"	1"			25/32"	Rockwell B80	ASME B18.6.2	1	91410A928	00000
				8"	1"			25/32"	Rockwell B80	ASME B18.6.2	1	91410A959	00000




								1 1/8"-7

								6"	1 1/8"	27/32"	Rockwell B80	ASME B18.6.2	1	91410A967	00000


								8"	1 1/8"	27/32"	Rockwell B80	ASME B18.6.2	1	91410A968	00000
								10"	1 1/8"	27/32"	Rockwell B80	ASME B18.6.2	1	91410A969	00000




										1 1/4"-7

										4"	1 1/4"	15/16"	Rockwell B80	ASME B18.6.2	1	91410A973	00000


										5"	1 1/4"	15/16"	Rockwell B80	ASME B18.6.2	1	91410A974	00000
										6"	1 1/4"	15/16"	Rockwell B80	ASME B18.6.2	1	91410A975	00000