Plain Steel Set Screws | McMaster-Carr

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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	000000000	00000


				1/2"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	50	000000000	00000
				5/8"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	50	000000000	00000
				3/4"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	50	000000000	00000
				7/8"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	10	000000000	0000
				1"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	50	000000000	00000
				1 1/2"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	25	000000000	0000
				1 3/4"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	10	000000000	0000
				2"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	10	000000000	0000
				2 1/4"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	10	000000000	0000
				2 1/2"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	5	000000000	0000


				2 3/4"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	5	000000000	0000
				3"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	5	000000000	0000
				6"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	1	000000000	00000




						5/16"-18

						3/8"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	10	000000000	0000


						1/2"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	50	000000000	00000
						3/4"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	50	000000000	00000
						1"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	50	000000000	00000
						1 1/4"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	50	000000000	00000
						1 1/2"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	25	000000000	00000
						2"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	25	000000000	00000
						2 1/2"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	5	000000000	0000
						3"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	10	000000000	00000
						3 1/2"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	1	000000000	0000
						4"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	1	000000000	0000


						6"	5/16"	1/4"	Rockwell B80	ASME B18.6.2	1	000000000	00000




								3/8"-16

								1/2"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	50	000000000	00000


								3/4"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	50	000000000	00000
								1"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	25	000000000	00000
								1 1/4"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	25	000000000	00000
								1 1/2"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	25	000000000	00000
								2"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	25	000000000	00000
								2 1/4"	3/8"	19/64"	Rockwell B80	ASME B18.6.2	5	000000000	0000
2 1/2"								3/8"	19/64"	Rockwell B80	ASME B18.6.2	10	000000000	00000
2 3/4"	3/8"							19/64"	Rockwell B80	ASME B18.6.2	5	000000000	00000
3"	3/8"							19/64"	Rockwell B80	ASME B18.6.2	10	000000000	00000
3 1/2"	3/8"							19/64"	Rockwell B80	ASME B18.6.2	10	000000000	00000


4"	3/8"	19/64"	Rockwell B80					ASME B18.6.2	5	000000000	00000
4 1/2"	3/8"	19/64"	Rockwell B80					ASME B18.6.2	1	000000000	0000
5"	3/8"	19/64"	Rockwell B80					ASME B18.6.2	1	000000000	0000




		7/16"-14

		3/4"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	5	000000000	0000


		1"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	10	000000000	00000
		1 1/4"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	5	000000000	0000
		1 1/2"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	5	000000000	0000
		1 3/4"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	5	000000000	0000
		2"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	5	000000000	0000
		2 1/4"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	1	000000000	0000
		2 1/2"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	1	000000000	0000
		3"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	1	000000000	0000
		4"	7/16"					11/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000




				1/2"-13

				5/8"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	5	000000000	0000


				3/4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	000000000	00000
				1"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	000000000	00000
				1 1/4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	000000000	00000
				1 1/2"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	000000000	00000
				2"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	000000000	00000
				2 1/4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
				2 1/2"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	10	000000000	00000
				2 3/4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
				3"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	5	000000000	00000
				3 1/4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	000000000	00000


				3 1/2"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	5	000000000	00000
				4"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	5	000000000	00000
				4 1/2"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
				5"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
				6"	1/2"			25/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
				8"	1/2"	25/64"		Rockwell B80	ASME B18.6.2	1	000000000	00000
				10"	1/2"	25/64"	Rockwell B80	ASME B18.6.2	1	000000000	00000




						5/8"-11

						3/4"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000


						1"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
						1 1/4"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
						1 1/2"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	5	000000000	00000
						1 3/4"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
						2"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	5	000000000	00000
						2 1/4"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
						2 1/2"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
						2 3/4"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
						3"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
						3 1/2"	5/8"	31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000


4"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
4 1/2"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
5"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
5 1/2"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	000000000	00000
6"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
8"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	000000000	00000
10"	5/8"					31/64"	Rockwell B80	ASME B18.6.2	1	000000000	00000




						3/4"-10

						2"	3/4"	37/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000


						2 1/2"	3/4"	37/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
		3"				3/4"	37/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
		3 1/2"	3/4"			37/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
		4"	3/4"			37/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
		5"	3/4"			37/64"	Rockwell B80	ASME B18.6.2	1	000000000	0000
		6"	3/4"			37/64"	Rockwell B80	ASME B18.6.2	1	000000000	00000




						7/8"-9

						2"	7/8"	21/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000


						3"	7/8"	21/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000
						4"	7/8"	43/64"	Rockwell B80	ASME B18.6.2	1	000000000	00000
						5"	7/8"	21/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000
						6"	7/8"	43/64"	Rockwell B80	ASME B18.6.2	1	000000000	00000
						8"	7/8"	21/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000
						12"	7/8"	21/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000




								1"-8

								2"	1"	25/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000


				3"	1"			25/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000
				4"	1"			25/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000
				5"	1"			25/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000
				6"	1"			25/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000
				8"	1"			25/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000




								1 1/8"-7

								6"	1 1/8"	27/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000


								8"	1 1/8"	27/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000
								10"	1 1/8"	27/32"	Rockwell B80	ASME B18.6.2	1	000000000	00000




										1 1/4"-7

										4"	1 1/4"	15/16"	Rockwell B80	ASME B18.6.2	1	000000000	00000


										5"	1 1/4"	15/16"	Rockwell B80	ASME B18.6.2	1	000000000	00000
										6"	1 1/4"	15/16"	Rockwell B80	ASME B18.6.2	1	000000000	00000