Steel Square Head Set Screws

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200 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.

Alloy Steel—With exceptional strength and hardness, these alloy steel screws excel in high-wear applications.

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

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







				1/4"-20

				1/2"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	10	000000000	000000


				5/8"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	10	000000000	00000
				3/4"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	10	000000000	00000
				1"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	10	000000000	00000
				1 1/4"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	10	000000000	00000
				1 1/2"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	10	000000000	00000
				2"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	1	000000000	00000




						5/16"-18

						1/2"	5/16"	1/4"	Rockwell C45	ASME B18.6.2	10	000000000	00000


						3/4"	5/16"	1/4"	Rockwell C45	ASME B18.6.2	10	000000000	00000
						1 1/2"	5/16"	1/4"	Rockwell C45	ASME B18.6.2	5	000000000	0000
						2 1/2"	5/16"	1/4"	Rockwell C45	ASME B18.6.2	1	000000000	00000




								3/8"-16

								3/4"	3/8"	19/64"	Rockwell C45	ASME B18.6.2	10	000000000	00000


								1"	3/8"	19/64"	Rockwell C45	ASME B18.6.2	5	000000000	0000
								1 1/4"	3/8"	19/64"	Rockwell C45	ASME B18.6.2	5	000000000	00000
								1 1/2"	3/8"	19/64"	Rockwell C45	ASME B18.6.2	5	000000000	00000
								2"	3/8"	19/64"	Rockwell C45	ASME B18.6.2	5	000000000	00000




										1/2"-13

										3/4"	1/2"	25/64"	Rockwell C45	ASME B18.6.2	5	000000000	00000


										1 1/2"	1/2"	25/64"	Rockwell C45	ASME B18.6.2	5	000000000	00000
										2"	1/2"	25/64"	Rockwell C45	ASME B18.6.2	5	000000000	00000
										3"	1/2"	25/64"	Rockwell C45	ASME B18.6.2	1	000000000	0000
										4"	1/2"	25/64"	Rockwell C45	ASME B18.6.2	1	000000000	00000




												5/8"-11

												2"	5/8"	31/64"	Rockwell C45	ASME B18.6.2	1	000000000	0000


3"	5/8"											31/64"	Rockwell C45	ASME B18.6.2	1	000000000	00000
4"	5/8"											31/64"	Rockwell C45	ASME B18.6.2	1	000000000	00000
5"	5/8"											31/64"	Rockwell C45	ASME B18.6.2	1	000000000	00000




		3/4"-10

		3 1/2"	3/4"									19/32"	Rockwell C45	ASME B18.6.2	1	000000000	00000


		4"	3/4"									19/32"	Rockwell C45	ASME B18.6.2	1	000000000	00000
		5"	3/4"									19/32"	Rockwell C45	ASME B18.6.2	1	000000000	00000


		Steel







												1/4"-20

												3/8"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	50	000000000	0000


												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

External-Square-Drive Steel Extended-Tip Set Screws

Tighten these screws to locate and hold components without worrying about your sockets slipping. Four large, flat sides give you reliable torque but slightly less than external hex drives. Like a dowel pin, the tip slides into mating holes on shafts, tubing, and other surfaces. Made of alloy steel, they're strong enough to hold components without wearing down. Also known as half dog-point set screws.

Black-Oxide Alloy Steel—These screws have a dark matte finish that offers minimal corrosion resistance, so they're best for dry environments.

		Tip		Head
	Lg.	Dia.	Lg.	Wd.	Ht.	Hardness	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







				1/4"-20

				1/2"	0.156"	0.063"	1/4"	3/16"	Rockwell C45	ASTM F912	1	000000000	00000


				1"	0.156"	0.063"	1/4"	3/16"	Rockwell C45	ASTM F912	1	000000000	0000
				2"	0.156"	0.063"	1/4"	3/16"	Rockwell C45	ASTM F912	1	000000000	0000




						5/16"-18

						1"	0.203"	0.078"	5/16"	15/64"	Rockwell C45	ASTM F912	1	000000000	0000


						1 1/4"	0.203"	0.078"	5/16"	15/64"	Rockwell C45	ASTM F912	1	000000000	0000
						1 1/2"	0.203"	0.078"	5/16"	15/64"	Rockwell C45	ASTM F912	1	000000000	0000




								3/8"-16

								3/4"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	000000000	0000


								1"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	000000000	0000
								1 1/4"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	000000000	0000
								1 1/2"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	000000000	0000
								2"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	000000000	0000
								2 1/2"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	000000000	0000
								3"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	000000000	0000




										1/2"-13

										1"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	000000000	0000


										1 1/4"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	000000000	0000
										1 1/2"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	000000000	0000
										2"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	000000000	0000
										2 1/2"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	000000000	0000
										3"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	000000000	0000
										4"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	000000000	00000




												5/8"-11

												2"	0.469"	0.156"	5/8"	15/32"	Rockwell C45	ASTM F912	1	000000000	00000


3"												0.469"	0.156"	5/8"	15/32"	Rockwell C45	ASTM F912	1	000000000	00000
4"	0.469"											0.156"	5/8"	15/32"	Rockwell C45	ASTM F912	1	000000000	00000
5"	0.469"											0.156"	5/8"	15/32"	Rockwell C45	ASTM F912	1	000000000	00000




		3/4"-10

		2"	0.563"									0.188"	3/4"	9/16"	Rockwell C45	ASTM F912	1	000000000	00000


		2 1/2"	0.563"									0.188"	3/4"	9/16"	Rockwell C45	ASTM F912	1	000000000	00000
		3"	0.563"									0.188"	3/4"	9/16"	Rockwell C45	ASTM F912	1	000000000	00000
		4"	0.563"									0.188"	3/4"	9/16"	Rockwell C45	ASTM F912	1	000000000	00000
		5"	0.563"									0.188"	3/4"	9/16"	Rockwell C45	ASTM F912	1	000000000	00000


		Alloy Steel







												M6 × 1 mm

												12 mm	4 mm	1.75 mm	6 mm	6 mm	Rockwell C20	DIN 479	10	000000000	0000


						16 mm	4 mm					1.75 mm	6 mm	6 mm	Rockwell C20	DIN 479	10	000000000	0000
						20 mm	4 mm					1.75 mm	6 mm	6 mm	Rockwell C20	DIN 479	10	000000000	0000
						25 mm	4 mm					1.75 mm	6 mm	6 mm	Rockwell C20	DIN 479	10	000000000	0000
						35 mm	4 mm					1.75 mm	6 mm	6 mm	Rockwell C20	DIN 479	10	000000000	00000




												M8 × 1.25 mm

												25 mm	5.5 mm	2.25 mm	8 mm	8 mm	Rockwell C22	DIN 479	5	000000000	0000


								30 mm				5.5 mm	2.25 mm	8 mm	8 mm	Rockwell C22	DIN 479	5	000000000	0000
								35 mm	5.5 mm			2.25 mm	8 mm	8 mm	Rockwell C22	DIN 479	5	000000000	0000
								40 mm	5.5 mm			2.25 mm	8 mm	8 mm	Rockwell C22	DIN 479	5	000000000	0000
								50 mm	5.5 mm			2.25 mm	8 mm	8 mm	Rockwell C22	DIN 479	5	000000000	0000




												M10 × 1.5 mm

												25 mm	7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	000000000	00000


												30 mm	7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	000000000	0000
												35 mm	7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	000000000	00000
										40 mm		7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	000000000	00000
										50 mm	7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	000000000	00000
										60 mm	7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	000000000	00000




												M12 × 1.75 mm

												35 mm	8.5 mm	3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	000000000	0000


40 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	000000000	0000
50 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	000000000	0000
60 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	000000000	0000
70 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	000000000	0000
80 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	000000000	0000
100 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	000000000	00000




												M16 × 2 mm

		50 mm										12 mm	4.3 mm	17 mm	16 mm	Rockwell C22	DIN 479	1	000000000	0000


		60 mm	12 mm									4.3 mm	17 mm	16 mm	Rockwell C22	DIN 479	1	000000000	0000
		80 mm	12 mm									4.3 mm	17 mm	16 mm	Rockwell C22	DIN 479	1	000000000	0000
		100 mm	12 mm	4.3 mm								17 mm	16 mm	Rockwell C22	DIN 479	1	000000000	00000




				M20 × 2.5 mm

				60 mm	15 mm							5.3 mm	22 mm	20 mm	Rockwell C23	DIN 479	1	000000000	00000


				70 mm	15 mm							5.3 mm	22 mm	20 mm	Rockwell C23	DIN 479	1	000000000	00000
				80 mm	15 mm							5.3 mm	22 mm	20 mm	Rockwell C23	DIN 479	1	000000000	00000
				100 mm	15 mm							5.3 mm	22 mm	20 mm	Rockwell C23	DIN 479	1	000000000	00000