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	91416A110	000000


				5/8"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	10	91416A115	00000
				3/4"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	10	91416A120	00000
				1"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	10	91416A125	00000
				1 1/4"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	10	91416A130	00000
				1 1/2"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	10	91416A135	00000
				2"	1/4"	13/64"	Rockwell C45	ASME B18.6.2	1	91416A550	00000




						5/16"-18

						1/2"	5/16"	1/4"	Rockwell C45	ASME B18.6.2	10	91416A210	00000


						3/4"	5/16"	1/4"	Rockwell C45	ASME B18.6.2	10	91416A215	00000
						1 1/2"	5/16"	1/4"	Rockwell C45	ASME B18.6.2	5	91416A220	0000
						2 1/2"	5/16"	1/4"	Rockwell C45	ASME B18.6.2	1	91416A593	00000




								3/8"-16

								3/4"	3/8"	19/64"	Rockwell C45	ASME B18.6.2	10	91416A310	00000


								1"	3/8"	19/64"	Rockwell C45	ASME B18.6.2	5	91416A315	0000
								1 1/4"	3/8"	19/64"	Rockwell C45	ASME B18.6.2	5	91416A320	00000
								1 1/2"	3/8"	19/64"	Rockwell C45	ASME B18.6.2	5	91416A325	00000
								2"	3/8"	19/64"	Rockwell C45	ASME B18.6.2	5	91416A330	00000




										1/2"-13

										3/4"	1/2"	25/64"	Rockwell C45	ASME B18.6.2	5	91416A410	00000


										1 1/2"	1/2"	25/64"	Rockwell C45	ASME B18.6.2	5	91416A415	00000
										2"	1/2"	25/64"	Rockwell C45	ASME B18.6.2	5	91416A420	00000
										3"	1/2"	25/64"	Rockwell C45	ASME B18.6.2	1	91416A425	0000
										4"	1/2"	25/64"	Rockwell C45	ASME B18.6.2	1	91416A728	00000




												5/8"-11

												2"	5/8"	31/64"	Rockwell C45	ASME B18.6.2	1	91416A510	0000


3"	5/8"											31/64"	Rockwell C45	ASME B18.6.2	1	91416A515	00000
4"	5/8"											31/64"	Rockwell C45	ASME B18.6.2	1	91416A520	00000
5"	5/8"											31/64"	Rockwell C45	ASME B18.6.2	1	91416A814	00000




		3/4"-10

		3 1/2"	3/4"									19/32"	Rockwell C45	ASME B18.6.2	1	91416A610	00000


		4"	3/4"									19/32"	Rockwell C45	ASME B18.6.2	1	91416A615	00000
		5"	3/4"									19/32"	Rockwell C45	ASME B18.6.2	1	91416A855	00000


		Steel







												1/4"-20

												3/8"	1/4"	3/16"	Rockwell B80	ASME B18.6.2	50	91410A535	0000


												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

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	91418A540	00000


				1"	0.156"	0.063"	1/4"	3/16"	Rockwell C45	ASTM F912	1	91418A542	0000
				2"	0.156"	0.063"	1/4"	3/16"	Rockwell C45	ASTM F912	1	91418A550	0000




						5/16"-18

						1"	0.203"	0.078"	5/16"	15/64"	Rockwell C45	ASTM F912	1	91418A583	0000


						1 1/4"	0.203"	0.078"	5/16"	15/64"	Rockwell C45	ASTM F912	1	91418A585	0000
						1 1/2"	0.203"	0.078"	5/16"	15/64"	Rockwell C45	ASTM F912	1	91418A587	0000




								3/8"-16

								3/4"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	91418A622	0000


								1"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	91418A625	0000
								1 1/4"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	91418A626	0000
								1 1/2"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	91418A628	0000
								2"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	91418A632	0000
								2 1/2"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	91418A634	0000
								3"	0.25"	0.094"	3/8"	9/32"	Rockwell C45	ASTM F912	1	91418A636	0000




										1/2"-13

										1"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	91418A712	0000


										1 1/4"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	91418A714	0000
										1 1/2"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	91418A716	0000
										2"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	91418A720	0000
										2 1/2"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	91418A722	0000
										3"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	91418A724	0000
										4"	0.344"	0.125"	1/2"	3/8"	Rockwell C45	ASTM F912	1	91418A730	00000




												5/8"-11

												2"	0.469"	0.156"	5/8"	15/32"	Rockwell C45	ASTM F912	1	91418A802	00000


3"												0.469"	0.156"	5/8"	15/32"	Rockwell C45	ASTM F912	1	91418A806	00000
4"	0.469"											0.156"	5/8"	15/32"	Rockwell C45	ASTM F912	1	91418A810	00000
5"	0.469"											0.156"	5/8"	15/32"	Rockwell C45	ASTM F912	1	91418A814	00000




		3/4"-10

		2"	0.563"									0.188"	3/4"	9/16"	Rockwell C45	ASTM F912	1	91418A843	00000


		2 1/2"	0.563"									0.188"	3/4"	9/16"	Rockwell C45	ASTM F912	1	91418A845	00000
		3"	0.563"									0.188"	3/4"	9/16"	Rockwell C45	ASTM F912	1	91418A847	00000
		4"	0.563"									0.188"	3/4"	9/16"	Rockwell C45	ASTM F912	1	91418A851	00000
		5"	0.563"									0.188"	3/4"	9/16"	Rockwell C45	ASTM F912	1	91418A855	00000


		Alloy Steel







												M6 × 1 mm

												12 mm	4 mm	1.75 mm	6 mm	6 mm	Rockwell C20	DIN 479	10	92635A254	0000


						16 mm	4 mm					1.75 mm	6 mm	6 mm	Rockwell C20	DIN 479	10	92635A256	0000
						20 mm	4 mm					1.75 mm	6 mm	6 mm	Rockwell C20	DIN 479	10	92635A258	0000
						25 mm	4 mm					1.75 mm	6 mm	6 mm	Rockwell C20	DIN 479	10	92635A260	0000
						35 mm	4 mm					1.75 mm	6 mm	6 mm	Rockwell C20	DIN 479	10	92635A264	00000




												M8 × 1.25 mm

												25 mm	5.5 mm	2.25 mm	8 mm	8 mm	Rockwell C22	DIN 479	5	92635A314	0000


								30 mm				5.5 mm	2.25 mm	8 mm	8 mm	Rockwell C22	DIN 479	5	92635A316	0000
								35 mm	5.5 mm			2.25 mm	8 mm	8 mm	Rockwell C22	DIN 479	5	92635A318	0000
								40 mm	5.5 mm			2.25 mm	8 mm	8 mm	Rockwell C22	DIN 479	5	92635A320	0000
								50 mm	5.5 mm			2.25 mm	8 mm	8 mm	Rockwell C22	DIN 479	5	92635A324	0000




												M10 × 1.5 mm

												25 mm	7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	92635A352	00000


												30 mm	7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	92635A354	0000
												35 mm	7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	92635A355	00000
										40 mm		7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	92635A358	00000
										50 mm	7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	92635A363	00000
										60 mm	7 mm	2.75 mm	10 mm	10 mm	Rockwell C22	DIN 479	5	92635A370	00000




												M12 × 1.75 mm

												35 mm	8.5 mm	3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	92635A419	0000


40 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	92635A421	0000
50 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	92635A426	0000
60 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	92635A430	0000
70 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	92635A433	0000
80 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	92635A436	0000
100 mm	8.5 mm											3.25 mm	13 mm	12 mm	Rockwell C22	DIN 479	1	92635A439	00000




												M16 × 2 mm

		50 mm										12 mm	4.3 mm	17 mm	16 mm	Rockwell C22	DIN 479	1	92635A540	0000


		60 mm	12 mm									4.3 mm	17 mm	16 mm	Rockwell C22	DIN 479	1	92635A543	0000
		80 mm	12 mm									4.3 mm	17 mm	16 mm	Rockwell C22	DIN 479	1	92635A546	0000
		100 mm	12 mm	4.3 mm								17 mm	16 mm	Rockwell C22	DIN 479	1	92635A549	00000




				M20 × 2.5 mm

				60 mm	15 mm							5.3 mm	22 mm	20 mm	Rockwell C23	DIN 479	1	92635A633	00000


				70 mm	15 mm							5.3 mm	22 mm	20 mm	Rockwell C23	DIN 479	1	92635A636	00000
				80 mm	15 mm							5.3 mm	22 mm	20 mm	Rockwell C23	DIN 479	1	92635A639	00000
				100 mm	15 mm							5.3 mm	22 mm	20 mm	Rockwell C23	DIN 479	1	92635A641	00000