SAE Square Head Bolts | McMaster-Carr

Filter by

Thread Size

Length

Threading

Head Width

Head Height

Thread Length

Specifications Met

Thread Fit

Unified Standard Class 2A

Unified Standard Class 3A

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

REACH

RoHS

55 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	000000000	00000	100	000000000	00000


				1"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	100	000000000	0000
				1 1/4"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	100	000000000	0000
				1 1/2"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	100	000000000	0000
				2"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	000000000	00000	100	000000000	0000
				3"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	000000000	00000	100	000000000	0000
				4"	Fully Threaded	—	Coarse	3/8"	11/64"	120,000	ASME B18.2.1, SAE J429	000000000	00000	100	000000000	0000




						5/16"-18 Threads

						3/4"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	100	000000000	00000


						1"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	100	000000000	00000
						1 1/4"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	000000000	00000	100	000000000	00000
						1 1/2"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	000000000	00000	100	000000000	00000
						2"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	000000000	00000	100	000000000	00000
						3"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	000000000	00000	100	000000000	00000
						4"	Fully Threaded	—	Coarse	1/2"	13/64"	120,000	ASME B18.2.1, SAE J429	000000000	00000	100	000000000	00000




								3/8"-16 Threads

								1"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	000000000	0000	50	000000000	00000


								1 1/2"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	000000000	0000	50	000000000	00000
								2"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	000000000	0000	50	000000000	00000
								2 1/2"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	000000000	0000	50	000000000	00000
								3"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	000000000	0000	50	000000000	00000
								4"	Fully Threaded	—	Coarse	9/16"	1/4"	120,000	ASME B18.2.1, SAE J429	000000000	0000	50	000000000	00000




										1/2"-13 Threads

										1"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	25	000000000	00000


										1 1/4"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	25	000000000	00000
										1 1/2"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	25	000000000	00000
										2"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	25	000000000	00000
										2 1/2"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	25	000000000	00000
										3"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	25	000000000	00000
										3 1/2"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	25	000000000	00000
										4"	Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	25	000000000	00000
										4 1/2"	Partially Threaded	1 1/4"	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	000000000	00000	25	000000000	00000
5"										Fully Threaded	—	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	25	000000000	00000
6"	Partially Threaded									1 1/4"	Coarse	3/4"	21/64"	120,000	ASME B18.2.1, SAE J429	000000000	00000	25	000000000	00000




		5/8"-11 Threads

		2"	Fully Threaded							—	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	10	000000000	0000


		2 1/2"	Fully Threaded							—	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	10	000000000	0000
		3"	Fully Threaded							—	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	10	000000000	0000
		4"	Fully Threaded							—	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	10	000000000	0000
		5"	Fully Threaded							—	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	000000000	0000	10	000000000	0000
		6"	Partially Threaded							1 1/2"	Coarse	15/16"	27/64"	120,000	ASME B18.2.1, SAE J429	000000000	00000	10	000000000	0000




										3/4"-10 Threads

				2"	Fully Threaded					—	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	000000000	0000	10	000000000	00000


				2 1/2"	Partially Threaded					1 3/4"	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	000000000	00000	10	000000000	00000
				3"	Fully Threaded					—	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	000000000	0000	10	000000000	00000
				3 1/2"	Partially Threaded					1 3/4"	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	000000000	00000	10	000000000	00000
				4"	Fully Threaded					—	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	000000000	0000	10	000000000	00000
				5"	Fully Threaded					—	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	000000000	00000	10	000000000	00000
				6"	Fully Threaded					—	Coarse	1 1/8"	1/2"	120,000	ASME B18.2.1, SAE J429	000000000	00000	10	000000000	00000




										1"-8 Threads

						3"	Fully Threaded			—	Coarse	1 1/2"	11/16"	120,000	ASME B18.2.1, SAE J429	000000000	00000	1	000000000	0000


						4"	Fully Threaded			—	Coarse	1 1/2"	11/16"	120,000	ASME B18.2.1, SAE J429	000000000	00000	1	000000000	0000
						5"	Fully Threaded			—	Coarse	1 1/2"	11/16"	120,000	ASME B18.2.1, SAE J429	000000000	00000	1	000000000	0000
						6"	Fully Threaded			—	Coarse	1 1/2"	11/16"	120,000	ASME B18.2.1, SAE J429	000000000	00000	1	000000000	0000