Grade 9 Steel Cap Screws

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30,000 psi to 99,999 psi

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72 Products

About Hex Head Screws and Bolts

Choose a hex head fastener with the right threading, thread size, material, and strength for your equipment.

Hex Head Profile

Standard

The most common hex head profile

69 products

Heavy

About 10% wider than standard heads to handle heavier loads

3 products

Performance

High Strength

Bear the burden of heavy loads and high stress without breaking

23 products

Corrosion Resistant

Stand up to moisture, chemicals, and harsh weather

27 products

Steel Hex Head Screws


Fully Threaded	Partially Threaded

Our most popular hex head screws. These have a head with six flat sides to keep wrenches and sockets from slipping and rounding off the drive.

Length is measured from under the head.

Medium-Strength Fastener—Your go-to screws for fastening most machinery and equipment. They have tensile strengths from 90,000 to 120,000 psi.

High-Strength Fastener—Commonly used to fasten components in valves, pumps, motors, and other high-stress applications. These screws have a tensile strength of 125,000 to 160,000 psi.

Low-Strength Fastener—Suitable for light duty applications, such as securing access panels. These screws have a tensile strength of 60,000 psi and lower.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

Zinc-Yellow-Chromate-Plated Steel—With slightly better corrosion resistance than zinc-plated steel screws, these stand up to more frequent exposure to moisture.

Hot-Dipped Galvanized Steel—The strength of steel with the rust resistance of stainless steel. These screws are an economical alternative to 18-8 stainless steel in wet and outdoor environments, but they won't hold up to salt water and chemicals. The galvanized finish is thicker than other types of coatings, so the threads may be more likely to stick during installation. You can only mate these screws with hot-dipped galvanized nuts.

Zinc-Flake-Coated Steel—The coating is tested to extreme standards, including at least 720 hours of salt spray resistance, to hold up in wet and outdoor environments. An embedded lubricant makes these screws easier to install than corrosion-resistant-coated screws.

		Head
	Lg.	Wd.	Ht.	Threading	Thread Spacing	Fastener Strength Grade/Class	Tensile Strength, psi	Pkg. Qty.		Pkg.
Medium-Strength Zinc-Plated Steel







				3/8"-16

				9"	9/16"	15/64"	Partially Threaded	Coarse	SAE Grade 5	120,000	5	91247A654	000000


				9"	9/16"	1/4"	Fully Threaded	Coarse	SAE Grade 5	120,000	1	92865A660	0000




						1/2"-13

						9"	3/4"	11/32"	Fully Threaded	Coarse	SAE Grade 5	120,000	1	92865A744	00000


						9"	3/4"	11/32"	Partially Threaded	Coarse	SAE Grade 5	120,000	1	91247A742	0000




								5/8"-11

								9"	15/16"	25/64"	Partially Threaded	Coarse	SAE Grade 5	120,000	1	91247A824	0000


								9"	15/16"	27/64"	Fully Threaded	Coarse	SAE Grade 5	120,000	1	92865A286	00000




										5/8"-18

										9"	15/16"	25/64"	Partially Threaded	Fine	SAE Grade 5	120,000	1	91247A461	0000




												3/4"-10

												9"	1 1/8"	15/32"	Partially Threaded	Coarse	SAE Grade 5	120,000	1	91247A868	0000


												9"	1 1/8"	1/2"	Fully Threaded	Coarse	SAE Grade 5	120,000	1	92865A872	00000




														3/4"-16

														9"	1 1/8"	15/32"	Partially Threaded	Fine	SAE Grade 5	120,000	1	91247A496	00000




																7/8"-9

																9"	1 5/16"	35/64"	Partially Threaded	Coarse	SAE Grade 5	120,000	1	91247A903	00000




																1"-8

		9"	1 1/2"													39/64"	Partially Threaded	Coarse	SAE Grade 5	120,000	1	91247A935	00000




																1"-14

																9"	1 1/2"	39/64"	Partially Threaded	Extra Fine	SAE Grade 5	120,000	1	91247A502	00000




																M14 × 1.5 mm

																75 mm	22 mm	9 mm	Partially Threaded	Fine	Class 8.8	110,000	1	91280A023	0000


																Medium-Strength Steel







																		1 1/4"-7

																		9"	1 7/8"	27/32"	Partially Threaded	Coarse	SAE Grade 5	100,000	1	91283A278	00000




																		M14 × 2 mm

																		30 mm	22 mm	9 mm	Fully Threaded	Coarse	Class 8.8	110,000	10	91280A213	0000


										35 mm	22 mm							9 mm	Fully Threaded	Coarse	Class 8.8	110,000	10	91280A214	00000
										40 mm	22 mm							9 mm	Fully Threaded	Coarse	Class 8.8	110,000	10	91280A215	00000


										High-Strength Zinc-Yellow-Chromate-Plated Steel







																		1/4"-20

																		9"	7/16"	5/32"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91257A416	0000




																		5/16"-18

																		9"	1/2"	13/64"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91257A122	0000




																		3/8"-16

																		9"	9/16"	15/64"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91257A654	0000




																		7/16"-14

																		9"	5/8"	9/32"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91257A696	0000




																		1/2"-13

																		9"	3/4"	5/16"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91257A742	0000




																1/2"-20

																9"			3/4"	5/16"	Partially Threaded	Fine	SAE Grade 8	150,000	1	91257A497	00000




																	5/8"-11

																	9"		15/16"	25/64"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91257A824	0000




																	5/8"-18

																	9"		15/16"	25/64"	Partially Threaded	Fine	SAE Grade 8	150,000	1	91257A837	00000




																				3/4"-10

										9"	1 1/8"									15/32"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91257A864	00000




												3/4"-16

												9"	1 1/8"							15/32"	Partially Threaded	Fine	SAE Grade 8	150,000	1	91257A890	00000




														7/8"-9

														9"	1 5/16"					35/64"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91257A930	00000




	7/8"-14

	9"														1 5/16"					35/64"	Partially Threaded	Fine	SAE Grade 8	150,000	1	91257A951	00000




		1"-8

		9"	1 1/2"																	39/64"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91257A981	00000




																				1"-14

				9"	1 1/2"															39/64"	Partially Threaded	Extra Fine	SAE Grade 8	150,000	1	91257A996	00000




																				1 1/8"-12

						9"														1 11/16"	11/16"	Partially Threaded	Fine	SAE Grade 8	150,000	1	92620A274	00000




																				1 1/2"-6

							9"									2 1/4"				15/16"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	92620A349	00000


							High-Strength Zinc-Flake-Coated Steel







																				1"-8

																				9"	1 1/2"	39/64"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91286A729	00000


																	High-Strength Steel







																				3/4"-10

												9"								1 1/8"	15/32"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91268A887	00000




																				7/8"-9

9"														1 5/16"						35/64"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91268A921	00000




																				1"-8

	9"																			1 1/2"	39/64"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91268A993	00000




																				1 1/4"-7

		9"	1 7/8"																	25/32"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91268A228	00000




																				1 1/2"-6

				9"	2 1/4"															15/16"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91268A964	00000




																				2"-4 1/2

						9"														3"	1 7/32"	Partially Threaded	Coarse	SAE Grade 8	150,000	1	91268A981	000000


						Low-Strength Zinc-Plated Steel







																				3/8"-16

								9"												9/16"	1/4"	Partially Threaded	Coarse	—	60,000	10	91236A654	00000




																				1/2"-13

																	9"			3/4"	11/32"	Partially Threaded	Coarse	—	60,000	5	91236A742	00000




																				5/8"-11

										9"	15/16"									27/64"	Partially Threaded	Coarse	—	60,000	5	91236A824	00000




																				3/4"-10

												9"	1 1/8"							1/2"	Partially Threaded	Coarse	—	60,000	1	91236A865	0000


												Low-Strength Hot-Dipped Galvanized Steel







																				1/2"-13

	9"																			3/4"	11/32"	Partially Threaded	Coarse	—	60,000	1	95373A251	0000

Stainless Steel Hex Head Screws

Fully Threaded

Partially

Threaded

Won't rust or corrode when exposed to moisture and chemicals. These screws have a head with six flat sides to keep wrenches and sockets from slipping and rounding off 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.

Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel screws, these won't degrade when exposed to harsh weather, salt water, and most chemicals.

		Head					Imported
	Lg.	Wd.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Pkg. Qty.		Pkg.
18-8 Stainless Steel







				1/4"-20

				9"	7/16"	5/32"	Fully Threaded	Coarse	80,000	1	92800A368	00000


				9"	7/16"	5/32"	Partially Threaded	Coarse	80,000	1	92198A575	0000




						5/16"-18

						9"	1/2"	13/64"	Partially Threaded	Coarse	80,000	1	92800A215	0000




								3/8"-16

								9"	9/16"	15/64"	Fully Threaded	Coarse	80,000	1	92800A388	0000


								9"	9/16"	15/64"	Partially Threaded	Coarse	80,000	1	92198A654	0000




										1/2"-13

										9"	3/4"	5/16"	Partially Threaded	Coarse	80,000	1	92198A742	0000




												5/8"-11

												9"	15/16"	25/64"	Partially Threaded	Coarse	80,000	1	92198A824	0000




														3/4"-10

														9"	1 1/8"	15/32"	Partially Threaded	Coarse	80,000	1	92198A865	0000




																7/8"-9

																9"	1 5/16"	35/64"	Partially Threaded	Coarse	80,000	1	92198A901	00000




																		1"-8

9"																		1 1/2"	39/64"	Partially Threaded	Coarse	80,000	1	92198A933	00000




		1 1/8"-7

		9"	1 11/16"															11/16"	Partially Threaded	Coarse	80,000	1	92800A341	00000




																		1 1/4"-7

																		9"	1 7/8"	25/32"	Partially Threaded	Coarse	80,000	1	92800A349	00000




																		1 1/2"-6

																		9"	2 1/4"	15/16"	Partially Threaded	Coarse	80,000	1	92800A358	00000


						Highly Corrosion-Resistant 316 Stainless Steel







																				1/4"-20

								9"												7/16"	5/32"	Partially Threaded	Coarse	70,000	1	92186A571	0000




																				5/16"-18

										9"	1/2"									13/64"	Partially Threaded	Coarse	70,000	1	92186A613	0000




																				3/8"-16

												9"	9/16"							15/64"	Partially Threaded	Coarse	70,000	1	92186A664	0000




																				1/2"-13

														9"	3/4"					5/16"	Partially Threaded	Coarse	70,000	1	92186A742	0000




																5/8"-11

																9"	15/16"			25/64"	Partially Threaded	Coarse	70,000	1	92186A830	00000




3/4"-10

9"	1 1/8"																			15/32"	Partially Threaded	Coarse	70,000	1	92186A872	00000




																				7/8"-9

		9"	1 5/16"																	35/64"	Partially Threaded	Coarse	70,000	1	92186A906	00000




																				1"-8

				9"	1 1/2"															39/64"	Partially Threaded	Coarse	70,000	1	92186A937	00000




																				1 1/2"-6

						9"														2 1/4"	15/16"	Partially Threaded	Coarse	70,000	1	92186A993	00000




																		1 3/4"-5

																		9"	2 5/8"	1 3/32"	Partially Threaded	Coarse	70,000	1	92186A998	00000

High-Pressure Stainless Steel Heavy Hex Head Screws

Partially

Threaded

Resist corrosion and meet ASTM standards for use in high-pressure and high-temperature applications. Also known as pressure bolts, these screws are often used to secure pressure tanks, valves, and flanges. They're also good for cold temperatures. With a head that's about 10% wider than standard hex head screws, they handle heavier loads by distributing them over a larger area. The head also has six flat sides to keep wrenches and sockets from slipping and rounding off the drive.

Length is measured from under the head.

ASTM Grade B8 18-8 Stainless Steel—A good choice for wet and outdoor environments, such as power plants and water treatment facilities. These screws withstand moisture and mild chemicals but won't hold up to the harsh chemicals that 316 stainless steel can.

Grip Length—Screws with a grip length have a precisely measured unthreaded section under the head, called a grip. It's stronger than the threaded section, so you can place it in joints exposed to sideways forces.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

			Head
	Lg.	Grip Lg.	Wd.	Ht.	Threading	Thread Spacing	Tensile Strength, psi		Each
ASTM Grade B8 18-8 Stainless Steel







				1/2"-13

				9"	7 1/2"	7/8"	5/16"	Partially Threaded	Coarse	75,000	92655A623	000000

Steel Heavy Hex Head Structural Screws

Partially

Threaded

Secure structural joints, such as mating I-beams, columns, and joists. With a head that's about 10% wider than standard hex head screws, these handle heavier loads by distributing them over a larger area. The head also has six flat sides to keep wrenches and sockets from slipping and rounding off the drive.

Length is measured from under the head.

Medium-Strength Fastener—Your go-to screws for fastening most machinery and equipment. They have tensile strengths from 90,000 to 120,000 psi.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

			Head
	Lg.	Grip Lg.	Wd.	Ht.	Threading	Thread Spacing	Fastener Strength Grade/Class	Tensile Strength, psi	Pkg. Qty.		Pkg.
Medium-Strength Hot-Dipped Galvanized Steel







				1 1/4"-7

				9"	7"	2"	25/32"	Partially Threaded	Coarse	ASTM Grade A325	120,000	1	91583A410	000000


				Medium-Strength Steel







								1 1/4"-7

								9"	7"	2"	25/32"	Partially Threaded	Coarse	ASTM Grade A325	120,000	1	91571A121	00000