94688A321 | Square Head Screw

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145 Products

Medium-Strength SAE Grade 5 Steel Square Head Screws


Fully Threaded	Partially Threaded

Made from Grade 5 steel, these screws are suitable for fastening most machinery and equipment. Large flat sides make them easy to grip with a wrench and keep them from rotating in square holes. A zinc yellow-chromate plating provides corrosion resistance in wet environments. Grade 5 steel square head screws are marked with three radial lines. Material meets SAE J429 specifications for quality. Dimensions meet ASME B18.2.1 specifications. Length is measured from under the head.

	Square Head Screws										Nuts
					Head
	Lg.	Threading	Min. Thread Lg.	Thread Spacing	Wd.	Ht.	Tensile Strength, psi	Specs. Met		Each	Pkg. Qty.		Pkg.
Zinc-Yellow-Chromate-Plated Steel







				1/4"-20 Threads

				3/4"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	92327A810	00000	100	98694A110	00000


				1"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	92327A811	0000	100	98694A110	0000
				1 1/4"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	92327A812	0000	100	98694A110	0000
				1 1/2"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	92327A813	0000	100	98694A110	0000
				2"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	92327A814	00000	100	98694A110	0000
				3"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	92327A111	00000	100	98694A110	0000
				4"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	92327A112	00000	100	98694A110	0000




						5/16"-18 Threads

						3/4"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	92327A815	0000	100	98694A115	00000


						1"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	92327A816	0000	100	98694A115	00000
						1 1/4"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	92327A817	00000	100	98694A115	00000
						1 1/2"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	92327A818	00000	100	98694A115	00000
						2"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	92327A819	00000	100	98694A115	00000
						3"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	92327A113	00000	100	98694A115	00000
						4"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	92327A114	00000	100	98694A115	00000




								3/8"-16 Threads

								1"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	92327A279	0000	50	98694A120	00000


								1 1/2"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	92327A283	0000	50	98694A120	00000
								2"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	92327A288	0000	50	98694A120	00000
								2 1/2"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	92327A820	0000	50	98694A120	00000
								3"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	92327A291	0000	50	98694A120	00000
								4"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	92327A294	0000	50	98694A120	00000




										1/2"-13 Threads

										1"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	92327A821	0000	25	98694A130	00000


										1 1/4"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	92327A822	0000	25	98694A130	00000
										1 1/2"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	92327A823	0000	25	98694A130	00000
										2"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	92327A304	0000	25	98694A130	00000
										2 1/2"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	92327A308	0000	25	98694A130	00000
										3"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	92327A311	0000	25	98694A130	00000
										3 1/2"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	92327A824	0000	25	98694A130	00000
										4"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	92327A314	0000	25	98694A130	00000
										4 1/2"	Partially Threaded	1 1/4"	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	92327A115	00000	25	98694A130	00000
5"										Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	92327A317	0000	25	98694A130	00000
6"	Partially Threaded									1 1/4"	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	92327A116	00000	25	98694A130	00000




		5/8"-11 Threads

		2"	Fully Threaded							—	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	92327A323	0000	10	98694A135	0000


		2 1/2"	Fully Threaded							—	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	92327A327	0000	10	98694A135	0000
		3"	Fully Threaded							—	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	92327A332	0000	10	98694A135	0000
		4"	Fully Threaded							—	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	92327A338	0000	10	98694A135	0000
		5"	Fully Threaded							—	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	92327A341	0000	10	98694A135	0000
		6"	Partially Threaded							1 1/2"	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	92327A117	00000	10	98694A135	0000




										3/4"-10 Threads

				2"	Fully Threaded					—	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	92327A825	0000	10	98694A140	00000


				2 1/2"	Partially Threaded					1 3/4"	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	92327A118	00000	10	98694A140	00000
				3"	Fully Threaded					—	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	92327A362	0000	10	98694A140	00000
				3 1/2"	Partially Threaded					1 3/4"	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	92327A119	00000	10	98694A140	00000
				4"	Fully Threaded					—	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	92327A365	0000	10	98694A140	00000
				5"	Fully Threaded					—	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	92327A367	00000	10	98694A140	00000
				6"	Fully Threaded					—	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	92327A369	00000	10	98694A140	00000




										1"-8 Threads

						3"	Fully Threaded			—	Coarse	1 1/2"	11/16"	120,000	ASME B18.2.1, SAE J429	92327A413	00000	1	98694A150	0000


						4"	Fully Threaded			—	Coarse	1 1/2"	11/16"	120,000	ASME B18.2.1, SAE J429	92327A419	00000	1	98694A150	0000
						5"	Fully Threaded			—	Coarse	1 1/2"	11/16"	120,000	ASME B18.2.1, SAE J429	92327A425	00000	1	98694A150	0000
						6"	Fully Threaded			—	Coarse	1 1/2"	11/16"	120,000	ASME B18.2.1, SAE J429	92327A431	00000	1	98694A150	0000

Low-Strength ASTM Grade A Steel Square Head Screws


Fully Threaded	Partially Threaded

About half the strength of medium-strength screws, these screws can be used for light duty fastening applications, such as securing access panels. Large flat sides make them easy to grip with a wrench and keep them from rotating in square holes. Material meets ASTM A307 specifications for quality. Length is measured from under the head.

	Square Head Screws											Nuts
					Head
	Lg.	Threading	Min. Thread Lg.	Thread Spacing	Wd.	Ht.	Tensile Strength, psi	Specs. Met	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
Steel







				1/4"-20 Threads

				1"	Fully Threaded	—	Coarse	3/8"	11/64"	60,000	ASTM A307	25	91465A101	000000	100	94855A127	000000


				1 1/4"	Partially Threaded	3/4"	Coarse	3/8"	11/64"	60,000	ASTM A307	25	91465A104	00000	100	94855A127	00000
				1 1/2"	Partially Threaded	3/4"	Coarse	3/8"	11/64"	60,000	ASTM A307	50	91465A107	00000	100	94855A127	00000
				2"	Partially Threaded	3/4"	Coarse	3/8"	11/64"	60,000	ASTM A307	25	91465A110	00000	100	94855A127	00000




						5/16"-18 Threads

						3/4"	Fully Threaded	—	Coarse	1/2"	13/64"	60,000	ASTM A307	25	91465A113	00000	100	90043A030	00000


						1"	Fully Threaded	—	Coarse	1/2"	13/64"	60,000	ASTM A307	25	91465A116	00000	100	90043A030	00000
						1 1/4"	Fully Threaded	—	Coarse	1/2"	13/64"	60,000	ASTM A307	25	91465A119	00000	100	90043A030	00000
						1 1/2"	Partially Threaded	7/8"	Coarse	1/2"	13/64"	60,000	ASTM A307	10	91465A122	0000	100	90043A030	00000
						2"	Partially Threaded	7/8"	Coarse	1/2"	13/64"	60,000	ASTM A307	10	91465A125	00000	100	90043A030	00000
						3"	Partially Threaded	7/8"	Coarse	1/2"	13/64"	60,000	ASTM A307	10	91465A128	00000	100	90043A030	00000
						4"	Partially Threaded	7/8"	Coarse	1/2"	13/64"	60,000	ASTM A307	10	91465A131	00000	100	90043A030	00000




								3/8"-16 Threads

								1"	Fully Threaded	—	Coarse	9/16"	1/4"	60,000	ASTM A307	10	91465A134	00000	100	90043A031	00000


								1 1/4"	Partially Threaded	1"	Coarse	9/16"	1/4"	60,000	ASTM A307	10	91465A137	0000	100	90043A031	00000
								1 1/2"	Partially Threaded	1"	Coarse	9/16"	1/4"	60,000	ASTM A307	10	91465A140	00000	100	90043A031	00000
								1 3/4"	Partially Threaded	1"	Coarse	9/16"	1/4"	60,000	ASTM A307	10	91465A143	00000	100	90043A031	00000
								2"	Partially Threaded	1"	Coarse	9/16"	1/4"	60,000	ASTM A307	10	91465A146	00000	100	90043A031	00000
								2 1/2"	Partially Threaded	1"	Coarse	9/16"	1/4"	60,000	ASTM A307	10	91465A149	00000	100	90043A031	00000
								3"	Partially Threaded	1"	Coarse	9/16"	1/4"	60,000	ASTM A307	10	91465A152	00000	100	90043A031	00000
								3 1/2"	Partially Threaded	1"	Coarse	9/16"	1/4"	60,000	ASTM A307	10	91465A155	00000	100	90043A031	00000




										1/2"-13 Threads

										1"	Fully Threaded	—	Coarse	3/4"	21/64"	60,000	ASTM A307	10	91465A158	00000	50	90043A055	00000


										1 1/2"	Fully Threaded	—	Coarse	3/4"	21/64"	60,000	ASTM A307	10	91465A161	00000	50	90043A055	00000
										1 3/4"	Fully Threaded	—	Coarse	3/4"	21/64"	60,000	ASTM A307	10	91465A164	00000	50	90043A055	00000
										2"	Partially Threaded	1 1/4"	Coarse	3/4"	21/64"	60,000	ASTM A307	10	91465A167	00000	50	90043A055	00000
										2 1/4"	Partially Threaded	1 1/4"	Coarse	3/4"	21/64"	60,000	ASTM A307	5	91465A170	00000	50	90043A055	00000
										2 1/2"	Partially Threaded	1 1/4"	Coarse	3/4"	21/64"	60,000	ASTM A307	5	91465A173	00000	50	90043A055	00000
										3"	Partially Threaded	1 1/4"	Coarse	3/4"	21/64"	60,000	ASTM A307	5	91465A176	00000	50	90043A055	00000
										3 1/2"	Partially Threaded	1 1/4"	Coarse	3/4"	21/64"	60,000	ASTM A307	5	91465A179	00000	50	90043A055	00000
										4"	Partially Threaded	1 1/4"	Coarse	3/4"	21/64"	60,000	ASTM A307	5	91465A182	00000	50	90043A055	00000
										5"	Partially Threaded	1 1/4"	Coarse	3/4"	21/64"	60,000	ASTM A307	5	91465A185	00000	50	90043A055	00000
6"										Partially Threaded	1 1/4"	Coarse	3/4"	21/64"	60,000	ASTM A307	5	91465A191	00000	50	90043A055	00000


8"	Partially Threaded									1 1/2"	Coarse	3/4"	21/64"	60,000	ASTM A307	1	91465A194	0000	50	90043A055	00000




		5/8"-11 Threads

		2"	Partially Threaded							1 1/2"	Coarse	15/16"	27/64"	60,000	ASTM A307	1	91465A209	0000	25	90043A065	00000


		2 1/2"	Partially Threaded							1 1/2"	Coarse	15/16"	27/64"	60,000	ASTM A307	5	91465A212	00000	25	90043A065	00000
		3"	Partially Threaded							1 1/2"	Coarse	15/16"	27/64"	60,000	ASTM A307	1	91465A215	0000	25	90043A065	00000
		3 1/2"	Partially Threaded							1 1/2"	Coarse	15/16"	27/64"	60,000	ASTM A307	1	91465A218	0000	25	90043A065	00000
		4"	Partially Threaded							1 1/2"	Coarse	15/16"	27/64"	60,000	ASTM A307	1	91465A221	0000	25	90043A065	00000
		4 1/2"	Partially Threaded							1 1/2"	Coarse	15/16"	27/64"	60,000	ASTM A307	1	91465A224	0000	25	90043A065	00000
		5"	Partially Threaded	1 1/2"						Coarse	15/16"	27/64"	60,000	ASTM A307	1	91465A227	0000	25	90043A065	00000
		6"	Partially Threaded	1 1/2"	Coarse					15/16"	27/64"	60,000	ASTM A307	1	91465A230	0000	25	90043A065	00000
		7"	Partially Threaded	1 3/4"	Coarse					15/16"	27/64"	60,000	ASTM A307	1	91465A233	0000	25	90043A065	00000
		11"	Partially Threaded	1 3/4"	Coarse					15/16"	27/64"	60,000	ASTM A307	1	91465A236	00000	25	90043A065	00000




				3/4"-10 Threads

				2 1/2"	Partially Threaded					1 3/4"	Coarse	1 1/8"	1/2"	60,000	ASTM A307	1	91465A242	0000	10	90043A075	00000


				3"	Partially Threaded					1 3/4"	Coarse	1 1/8"	1/2"	60,000	ASTM A307	1	91465A245	0000	10	90043A075	00000
				3 3/4"	Partially Threaded					1 3/4"	Coarse	1 1/8"	1/2"	60,000	ASTM A307	1	91465A248	0000	10	90043A075	00000
				4"	Partially Threaded					1 3/4"	Coarse	1 1/8"	1/2"	60,000	ASTM A307	1	91465A251	0000	10	90043A075	00000
				4 1/2"	Partially Threaded	1 3/4"				Coarse	1 1/8"	1/2"	60,000	ASTM A307	1	91465A254	0000	10	90043A075	00000
				5"	Partially Threaded	1 3/4"	Coarse			1 1/8"	1/2"	60,000	ASTM A307	1	91465A257	0000	10	90043A075	00000
				5 1/2"	Partially Threaded	1 3/4"	Coarse			1 1/8"	1/2"	60,000	ASTM A307	1	91465A260	0000	10	90043A075	00000
				6"	Partially Threaded	1 3/4"	Coarse			1 1/8"	1/2"	60,000	ASTM A307	1	91465A263	0000	10	90043A075	00000
				7"	Partially Threaded	2"	Coarse			1 1/8"	1/2"	60,000	ASTM A307	1	91465A266	0000	10	90043A075	00000
				8"	Partially Threaded	2"	Coarse			1 1/8"	1/2"	60,000	ASTM A307	1	91465A269	00000	10	90043A075	00000
				9"	Partially Threaded	2"	Coarse			1 1/8"	1/2"	60,000	ASTM A307	1	91465A272	00000	10	90043A075	00000


				10"	Partially Threaded	2"	Coarse			1 1/8"	1/2"	60,000	ASTM A307	1	91465A275	00000	10	90043A075	00000
				12"	Partially Threaded	2"	Coarse			1 1/8"	1/2"	60,000	ASTM A307	1	91465A278	00000	10	90043A075	00000




						1"-8 Threads

						6"	Partially Threaded	2 1/4"		Coarse	1 1/2"	21/32"	60,000	ASTM A307	1	91465A287	00000	5	90043A095	00000


						7"	Partially Threaded	2 1/2"	Coarse	1 1/2"	21/32"	60,000	ASTM A307	1	91465A290	00000	5	90043A095	00000
						9"	Partially Threaded	2 1/2"	Coarse	1 1/2"	21/32"	60,000	ASTM A307	1	91465A293	00000	5	90043A095	00000
						10"	Partially Threaded	2 1/2"	Coarse	1 1/2"	21/32"	60,000	ASTM A307	1	91465A296	00000	5	90043A095	00000

High-Strength SAE Grade 8 Steel Square Head Screws

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. Large flat sides make them easy to grip with a wrench and keep them from rotating in square holes. A zinc yellow-chromate plating provides corrosion resistance in wet environments. Grade 8 steel square head screws are marked with six radial lines. Dimensions meet ASME B18.2.1 specifications. Length is measured from under the head.

				Head
	Lg.	Threading	Thread Spacing	Wd.	Ht.	Tensile Strength, psi	Specs. Met		Each
Zinc-Yellow-Chromate-Plated Steel







				1/4"-20 Threads

				3/4"	Fully Threaded	Coarse	3/8"	11/64"	150,000	ASME B18.2.1	94688A310	000000


				1"	Fully Threaded	Coarse	3/8"	11/64"	150,000	ASME B18.2.1	94688A311	00000
				1 1/4"	Fully Threaded	Coarse	3/8"	11/64"	150,000	ASME B18.2.1	94688A312	00000
				1 1/2"	Fully Threaded	Coarse	3/8"	11/64"	150,000	ASME B18.2.1	94688A313	00000




						5/16"-18 Threads

						3/4"	Fully Threaded	Coarse	1/2"	13/64"	150,000	ASME B18.2.1	94688A314	00000


						1"	Fully Threaded	Coarse	1/2"	13/64"	150,000	ASME B18.2.1	94688A315	00000
						1 1/4"	Fully Threaded	Coarse	1/2"	13/64"	150,000	ASME B18.2.1	94688A316	00000
						1 1/2"	Fully Threaded	Coarse	1/2"	13/64"	150,000	ASME B18.2.1	94688A317	00000




								3/8"-16 Threads

								1"	Fully Threaded	Coarse	9/16"	1/4"	150,000	ASME B18.2.1	94688A318	00000


								1 1/4"	Fully Threaded	Coarse	9/16"	1/4"	150,000	ASME B18.2.1	94688A319	00000
								1 1/2"	Fully Threaded	Coarse	9/16"	1/4"	150,000	ASME B18.2.1	94688A320	00000
								2"	Fully Threaded	Coarse	9/16"	1/4"	150,000	ASME B18.2.1	94688A321	00000
								High-Strength SAE Grade 8 Steel Square Head Screw, 3/8"-16 Thread Size, 2" Long Product Detail QuantityEachIn stock Select a compatible file type: Parasolid
								2 1/2"	Fully Threaded	Coarse	9/16"	1/4"	150,000	ASME B18.2.1	94688A322	00000
								3"	Fully Threaded	Coarse	9/16"	1/4"	150,000	ASME B18.2.1	94688A323	00000




										1/2"-13 Threads

										1"	Fully Threaded	Coarse	3/4"	21/64"	150,000	ASME B18.2.1	94688A324	00000


										1 1/4"	Fully Threaded	Coarse	3/4"	21/64"	150,000	ASME B18.2.1	94688A325	00000
										1 1/2"	Fully Threaded	Coarse	3/4"	21/64"	150,000	ASME B18.2.1	94688A326	00000
										2"	Fully Threaded	Coarse	3/4"	21/64"	150,000	ASME B18.2.1	94688A327	00000
										2 1/2"	Fully Threaded	Coarse	3/4"	21/64"	150,000	ASME B18.2.1	94688A328	00000
										3"	Fully Threaded	Coarse	3/4"	21/64"	150,000	ASME B18.2.1	94688A329	00000
										3 1/2"	Fully Threaded	Coarse	3/4"	21/64"	150,000	ASME B18.2.1	94688A330	00000
										4"	Fully Threaded	Coarse	3/4"	21/64"	150,000	ASME B18.2.1	94688A331	00000




												5/8"-11 Threads

2"												Fully Threaded	Coarse	15/16"	27/64"	150,000	ASME B18.2.1	94688A332	00000


2 1/2"	Fully Threaded											Coarse	15/16"	27/64"	150,000	ASME B18.2.1	94688A333	00000
3"	Fully Threaded											Coarse	15/16"	27/64"	150,000	ASME B18.2.1	94688A334	00000