Sems Socket Head Cap Screws

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39 Products

Stainless Steel Socket Head Screws with Split Lock Washer

Light vibration won't loosen these corrosion-resistant screws. As you twist, the uneven ends of the washer bite into the screw and mating surface for a tight hold. Also known as Sems screws, the washer rotates freely but is permanently attached. Their deep, six-point socket keeps hex keys from slipping out and damaging the drive.

Length is measured from under the head.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws won't rust. However, they don't hold up to the harsh chemicals that 316 stainless steel screws can.

		Head		Washer
	Lg.	Dia.	Ht.	OD	Thk.	Threading	Thread Spacing	Tensile Strength, psi	Specs. Met		Each
18-8 Stainless Steel







				6-32

				1/4"	0.226"	0.138"	0.204"	0.04"	Fully Threaded	Coarse	70,000	ASTM F837	94912A100	00000


				3/8"	0.226"	0.138"	0.204"	0.04"	Fully Threaded	Coarse	70,000	ASTM F837	94912A105	0000
				1/2"	0.226"	0.138"	0.204"	0.04"	Fully Threaded	Coarse	70,000	ASTM F837	94912A110	0000
				3/4"	0.226"	0.138"	0.204"	0.04"	Fully Threaded	Coarse	70,000	ASTM F837	94912A115	0000




						8-32

						3/8"	0.27"	0.164"	0.243"	3/64"	Fully Threaded	Coarse	70,000	ASTM F837	94912A220	0000


						1/2"	0.27"	0.164"	0.243"	3/64"	Fully Threaded	Coarse	70,000	ASTM F837	94912A225	0000
						5/8"	0.27"	0.164"	0.243"	3/64"	Fully Threaded	Coarse	70,000	ASTM F837	94912A230	0000
						3/4"	0.27"	0.164"	0.243"	3/64"	Fully Threaded	Coarse	70,000	ASTM F837	94912A235	0000
						1"	0.27"	0.164"	0.243"	3/64"	Fully Threaded	Coarse	70,000	ASTM F837	94912A240	0000




								10-32

								1/2"	5/16"	0.19"	19/64"	3/64"	Fully Threaded	Fine	70,000	ASTM F837	94912A330	0000


								5/8"	5/16"	0.19"	19/64"	3/64"	Fully Threaded	Fine	70,000	ASTM F837	94912A335	0000
								3/4"	5/16"	0.19"	19/64"	3/64"	Fully Threaded	Fine	70,000	ASTM F837	94912A340	0000
								1"	5/16"	0.19"	19/64"	3/64"	Fully Threaded	Fine	70,000	ASTM F837	94912A345	0000




										1/4"-20

										1/2"	3/8"	1/4"	0.354"	1/16"	Fully Threaded	Coarse	70,000	ASTM F837	94912A450	0000


										5/8"	3/8"	1/4"	0.354"	1/16"	Fully Threaded	Coarse	70,000	ASTM F837	94912A455	0000
										3/4"	3/8"	1/4"	0.354"	1/16"	Fully Threaded	Coarse	70,000	ASTM F837	94912A460	0000
										1"	3/8"	1/4"	0.354"	1/16"	Fully Threaded	Coarse	70,000	ASTM F837	94912A465	0000
										1 1/4"	3/8"	1/4"	0.354"	1/16"	Fully Threaded	Coarse	70,000	ASTM F837	94912A470	0000

Steel Socket Head Screws with Split Lock Washer

Light vibration won't loosen these screws. As you twist, the uneven ends of the washer bite into the screw and mating surface for a tight hold. Also known as Sems screws, the washer rotates freely but is permanently attached. These are our strongest alloy steel screws. Their deep, six-point socket keeps hex keys from slipping out and damaging the drive.

Length is measured from under the head.

Black-Oxide Alloy Steel—Typically chosen for their appearance, these screws have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

		Head		Washer
	Lg.	Dia.	Ht.	OD	Thk.	Threading	Thread Spacing	Tensile Strength, psi		Each
Black-Oxide Alloy Steel







				4-40

				1/4"	0.183"	0.112"	11/64"	0.03"	Fully Threaded	Coarse	180,000	90342A111	00000


				3/8"	0.183"	0.112"	11/64"	0.03"	Fully Threaded	Coarse	180,000	90342A112	0000
				1/2"	0.183"	0.112"	11/64"	0.03"	Fully Threaded	Coarse	180,000	90342A113	0000




						6-32

						1/4"	0.226"	0.138"	0.204"	0.04"	Fully Threaded	Coarse	180,000	90342A114	0000


						3/8"	0.226"	0.138"	0.204"	0.04"	Fully Threaded	Coarse	180,000	90342A115	0000
						1/2"	0.226"	0.138"	0.204"	0.04"	Fully Threaded	Coarse	180,000	90342A116	0000




								8-32

								3/8"	0.27"	0.164"	0.243"	3/64"	Fully Threaded	Coarse	180,000	90342A117	0000


								1/2"	0.27"	0.164"	0.243"	3/64"	Fully Threaded	Coarse	180,000	90342A118	0000
								5/8"	0.27"	0.164"	0.243"	3/64"	Fully Threaded	Coarse	180,000	90342A119	0000
								3/4"	0.27"	0.164"	0.243"	3/64"	Fully Threaded	Coarse	180,000	90342A120	0000
								1"	0.27"	0.164"	0.243"	3/64"	Fully Threaded	Coarse	180,000	90342A121	0000




										10-32

										3/8"	5/16"	0.19"	19/64"	3/64"	Fully Threaded	Fine	180,000	90342A122	0000


										1/2"	5/16"	0.19"	19/64"	3/64"	Fully Threaded	Fine	180,000	90342A123	0000
										3/4"	5/16"	0.19"	19/64"	3/64"	Fully Threaded	Fine	180,000	90342A124	0000
										1"	5/16"	0.19"	19/64"	3/64"	Fully Threaded	Fine	180,000	90342A125	0000




												1/4"-20

												3/8"	3/8"	1/4"	0.354"	1/16"	Fully Threaded	Coarse	180,000	90342A126	0000


												1/2"	3/8"	1/4"	0.354"	1/16"	Fully Threaded	Coarse	180,000	90342A127	0000
												3/4"	3/8"	1/4"	0.354"	1/16"	Fully Threaded	Coarse	180,000	90342A128	0000
												1"	3/8"	1/4"	0.354"	1/16"	Fully Threaded	Coarse	180,000	90342A129	0000
												1 1/4"	3/8"	1/4"	0.354"	1/16"	Fully Threaded	Coarse	180,000	90342A130	0000
												1 1/2"	3/8"	1/4"	0.354"	1/16"	Fully Threaded	Coarse	180,000	90342A131	0000