Grade 8 Hex Head Cap Screws

Steeped in Kimball Midwest's commitment to American-made quality, our Grade 8 Hex Head cap screws are known for their superior strength and durability. They're ideal for heavy-duty applications where superior tensile strength is necessary.

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KM-USA High Head Grade 8 Cap Screws - USS
KM-USA High Head Grade 8 Cap Screws - USS
With a taller head for improved wrench grip, these KM‑USA High Head Grade 8 screws offer enhanced alignment in tough MRO applications. Special alloy steel delivers 150,000 PSI tensile strength, while zinc yellow plating resists corrosion. Perfect for machinery needing extra torque, they’re made in the USA for assured quality. Combine with Grade 8 washers and nuts for maximum reliability.
Diameter: 1/4"

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1/2" 1/4"-20 Coarse KM-USA High Head 25 380404J Log in to view price
1/2" 1/4"-20 Coarse KM-USA High Head 100 380404 Log in to view price
3/4" 1/4"-20 Coarse KM-USA High Head 25 380406J Log in to view price
3/4" 1/4"-20 Coarse KM-USA High Head 100 380406 Log in to view price
1" 1/4"-20 Coarse KM-USA High Head 25 380408J Log in to view price
1" 1/4"-20 Coarse KM-USA High Head 100 380408 Log in to view price
1-1/4" 1/4"-20 Coarse KM-USA High Head 25 380410J Log in to view price
1-1/4" 1/4"-20 Coarse KM-USA High Head 100 380410 Log in to view price
1-1/2" 1/4"-20 Coarse KM-USA High Head 25 380412J Log in to view price
1-1/2" 1/4"-20 Coarse KM-USA High Head 100 380412 Log in to view price
1-3/4" 1/4"-20 Coarse KM-USA High Head 25 380414J Log in to view price
1-3/4" 1/4"-20 Coarse KM-USA High Head 100 380414 Log in to view price
KM-USA High Head Grade 8 Cap Screws - SAE
KM-USA High Head Grade 8 Cap Screws - SAE
Boasting a 20% taller head for improved tool contact, these KM‑USA High Head Grade 8 Cap Screws (SAE) resist fatigue with a 150,000 PSI rating. The chrome alloy steel design supports easy alignment, while a zinc yellow finish guards against corrosion. Ideal for engine blocks, pumps, or structural assemblies, they’re 100% made in the USA. Use matching washers and nuts for reliable, long‑lasting performance.
Diameter: 1/4"

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1/2" 1/4"-28 Fine KM-USA High Head 25 390404J Log in to view price
1/2" 1/4"-28 Fine KM-USA High Head 100 390404 Log in to view price
3/4" 1/4"-28 Fine KM-USA High Head 25 390406J Log in to view price
3/4" 1/4"-28 Fine KM-USA High Head 100 390406 Log in to view price
1" 1/4"-28 Fine KM-USA High Head 25 390408J Log in to view price
1" 1/4"-28 Fine KM-USA High Head 100 390408 Log in to view price
1-1/4" 1/4"-28 Fine KM-USA High Head 25 390410J Log in to view price
1-1/4" 1/4"-28 Fine KM-USA High Head 100 390410 Log in to view price
1-1/2" 1/4"-28 Fine KM-USA High Head 25 390412J Log in to view price
1-1/2" 1/4"-28 Fine KM-USA High Head 100 390412 Log in to view price
1-3/4" 1/4"-28 Fine KM-USA High Head 25 390414J Log in to view price
1-3/4" 1/4"-28 Fine KM-USA High Head 100 390414 Log in to view price
Standard Grade 8 (USS) Hex Head Cap Screws - Zinc Plated
Standard Grade 8 (USS) Hex Head Cap Screws - Zinc Plated
Built to handle demanding tasks, these Grade 8 (USS) hex head cap screws feature a high‑tensile steel design for extra safety. The zinc yellow plating provides added corrosion resistance, while a 150,000 PSI minimum tensile strength ensures durability under stress. Use with matching nuts and washers in agricultural machinery or heavy equipment assembly for robust, lasting performance.
Diameter: 1/4"

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1/2" 1/4"-20 Coarse Standard 100 580404 Log in to view price
5/8" 1/4"-20 Coarse Standard 100 580405 Log in to view price
3/4" 1/4"-20 Coarse Standard 100 580406 Log in to view price
7/8" 1/4"-20 Coarse Standard 100 580407 Log in to view price
1" 1/4"-20 Coarse Standard 100 580408 Log in to view price
1-1/4" 1/4"-20 Coarse Standard 100 580410 Log in to view price
1-1/2" 1/4"-20 Coarse Standard 100 580412 Log in to view price
1-3/4" 1/4"-20 Coarse Standard 100 580414 Log in to view price
2" 1/4"-20 Coarse Standard 100 580416 Log in to view price
2-1/4" 1/4"-20 Coarse Standard 50 580418 Log in to view price
2-1/2" 1/4"-20 Coarse Standard 50 580420 Log in to view price
2-3/4" 1/4"-20 Coarse Standard 50 580422 Log in to view price
Standard Grade 8 (SAE) Hex Head Cap Screws - Zinc Plated
Standard Grade 8 (SAE) Hex Head Cap Screws - Zinc Plated
Engineered for critical fastening, these Grade 8 (SAE) hex head cap screws meet ASME B18.2 standards. With a zinc yellow plating, they deliver reliable corrosion resistance and 150,000 PSI tensile strength. Ideal for automotive engines or industrial setups, they install best on clean surfaces with the correct torque. Pair with recommended washers and nuts to ensure safe, vibration‑resistant connections.
Diameter: 1/4"

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1/2" 1/4"-28 Fine Standard 100 590404 Log in to view price
3/4" 1/4"-28 Fine Standard 100 590406 Log in to view price
1" 1/4"-28 Fine Standard 100 590408 Log in to view price
1-1/4" 1/4"-28 Fine Standard 100 590410 Log in to view price
1-1/2" 1/4"-28 Fine Standard 100 590412 Log in to view price
1-3/4" 1/4"-28 Fine Standard 100 590414 Log in to view price
2" 1/4"-28 Fine Standard 100 590416 Log in to view price
2-1/4" 1/4"-28 Fine Standard 50 590418 Log in to view price
2-1/2" 1/4"-28 Fine Standard 50 590420 Log in to view price
2-3/4" 1/4"-28 Fine Standard 50 590422 Log in to view price
3" 1/4"-28 Fine Standard 50 590424 Log in to view price
3-1/4" 1/4"-28 Fine Standard 25 590426 Log in to view price
Armor Coat™ Grade 8 Hex Head Cap Screws
Armor Coat™ Grade 8 Hex Head Cap Screws
Featuring an Armor Coat finish for exceptional corrosion protection, these Grade 8 hex head cap screws withstand harsh environments with ease. They surpass 1,000‑hour salt spray tests and offer up to 150,000 PSI tensile strength—outperforming stainless steel in demanding conditions. Install where rust is a concern, such as marine, off‑road, or chemical processing settings. Pair with matching washers and nuts for best results.
Diameter: 1/4"

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1/2" 1/4"-20 Coarse Armor Coat™ 100 3820404 Log in to view price
3/4" 1/4"-20 Coarse Armor Coat™ 100 3820406 Log in to view price
1" 1/4"-20 Coarse Armor Coat™ 100 3820408 Log in to view price
1-1/4" 1/4"-20 Coarse Armor Coat™ 100 3820410 Log in to view price
1-1/2" 1/4"-20 Coarse Armor Coat™ 100 3820412 Log in to view price
1-3/4" 1/4"-20 Coarse Armor Coat™ 50 3820414 Log in to view price
2" 1/4"-20 Coarse Armor Coat™ 50 3820416 Log in to view price
2-1/4" 1/4"-20 Coarse Armor Coat™ 50 3820418 Log in to view price
2-1/2" 1/4"-20 Coarse Armor Coat™ 50 3820420 Log in to view price
2-3/4" 1/4"-20 Coarse Armor Coat™ 50 3820422 Log in to view price
3" 1/4"-20 Coarse Armor Coat™ 50 3820424 Log in to view price
Diameter: 5/16"

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3/4" 5/16"-18 Coarse Armor Coat™ 100 3820506 Log in to view price
Grade 8 Fully Threaded Hex Head Tap Bolts
Grade 8 Fully Threaded Hex Head Tap Bolts
For full thread engagement, these Grade 8 fully threaded tap bolts offer maximum grip in tight or deep tapped holes. A zinc yellow trivalent plating shields against corrosion, while 150,000 PSI tensile strength ensures dependable hold in heavy equipment or engine assemblies. Align bolt threads carefully and secure with recommended washers and nuts. Perfect for tasks demanding extra reach and consistent threading.
Diameter: 1/4"

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1-1/4" 1/4"-20 Coarse Tap Bolt 50 384410 Log in to view price
1-1/2" 1/4"-20 Coarse Tap Bolt 50 384412 Log in to view price
2" 1/4"-20 Coarse Tap Bolt 50 384416 Log in to view price
2-1/2" 1/4"-20 Coarse Tap Bolt 25 384420 Log in to view price
3" 1/4"-20 Coarse Tap Bolt 25 384424 Log in to view price
Diameter: 5/16"

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1-1/2" 5/16"-18 Coarse Tap Bolt 50 384512 Log in to view price
1-3/4" 5/16"-18 Coarse Tap Bolt 50 384514 Log in to view price
2" 5/16"-18 Coarse Tap Bolt 50 384516 Log in to view price
2-1/2" 5/16"-18 Coarse Tap Bolt 25 384520 Log in to view price
3" 5/16"-18 Coarse Tap Bolt 25 384524 Log in to view price
Diameter: 3/8"

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1-1/2" 3/8"-16 Coarse Tap Bolt 50 384612 Log in to view price
1-3/4" 3/8"-16 Coarse Tap Bolt 50 384614 Log in to view price
Standard Grade 8 (USS) Hex Head Cap Screws - Plain Finish
Standard Grade 8 (USS) Hex Head Cap Screws - Plain Finish
Designed for high‑stress needs, these Grade 8 (USS) hex head cap screws come in a plain finish suited for applications where extra corrosion protection isn’t required. Made from medium carbon alloy steel, they meet ASME B18.2 standards for reliable performance. With a 150,000 PSI tensile strength, they’re ideal in structural and machinery use. Combine with Grade 8 washers and nuts, following proper torque guidelines.
Diameter: 1/4"

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1/2" 1/4"-20 Coarse Standard 100 3810404 Log in to view price
3/4" 1/4"-20 Coarse Standard 100 3810406 Log in to view price
1" 1/4"-20 Coarse Standard 100 3810408 Log in to view price
1-1/4" 1/4"-20 Coarse Standard 100 3810410 Log in to view price
1-1/2" 1/4"-20 Coarse Standard 100 3810412 Log in to view price
1-3/4" 1/4"-20 Coarse Standard 100 3810414 Log in to view price
2" 1/4"-20 Coarse Standard 100 3810416 Log in to view price
2-1/4" 1/4"-20 Coarse Standard 50 3810418 Log in to view price
2-1/2" 1/4"-20 Coarse Standard 50 3810420 Log in to view price
3" 1/4"-20 Coarse Standard 50 3810424 Log in to view price
Diameter: 5/16"

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1/2" 5/16"-18 Coarse Standard 100 3810504 Log in to view price
3/4" 5/16"-18 Coarse Standard 100 3810506 Log in to view price
Standard Grade 8 (SAE) Hex Head Cap Screws - Plain Finish
Standard Grade 8 (SAE) Hex Head Cap Screws - Plain Finish
Ideal for heavy loads where plating isn’t essential, these Grade 8 (SAE) plain finish hex head cap screws deliver reliable strength in MRO environments. The medium carbon alloy steel construction meets ASME B18.2 specs for proven performance. For best results, pair with Grade 8 washers and nuts, applying recommended torque in automotive or industrial machinery.
Diameter: 3/8"

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3/4" 5/16"-24 Fine Standard 100 3910508 Log in to view price
1" 3/8"-24 Fine Standard 100 3910608 Log in to view price
1-1/2" 3/8"-24 Fine Standard 100 3910612 Log in to view price
1-3/4" 3/8"-24 Fine Standard 100 3910614 Log in to view price
2" 3/8"-24 Fine Standard 100 3910616 Log in to view price
2-1/2" 3/8"-24 Fine Standard 50 3910620 Log in to view price
3" 3/8"-24 Fine Standard 50 3910624 Log in to view price
3-1/2" 3/8"-24 Fine Standard 25 3910628 Log in to view price
4" 3/8"-24 Fine Standard 25 3910632 Log in to view price
Diameter: 7/16"

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1" 7/16"-20 Fine Standard 50 3910708 Log in to view price
1-1/2" 7/16"-20 Fine Standard 50 3910712 Log in to view price
2" 7/16"-20 Fine Standard 50 3910716 Log in to view price
Grade 8 Hex Head Cap Screws Products
Grade 8 Hex Head Cap Screws Products
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Steeped in Kimball Midwest's commitment to American-made quality, our Grade 8 Hex Head cap screws are known for their superior strength and durability. They're ideal for heavy-duty applications where superior tensile strength is necessary.

Superior Strength and Durability

Our Grade 8 cap screws are crafted from high-strength carbon alloy steel and are designed for demanding applications and to deliver an extra margin of job safety. Their impressive strength makes them suitable for various industrial, machinery and automotive applications.

Cap Screws For Versatile Applications

Our hex head cap screws come in various sizes and lengths, making them versatile for different uses. Whether you need fasteners for machinery, construction or maintenance tasks, our Grade 8 screws offer the reliability you need to get the job done right. Choose from a variety of screw series including Armor Coat™, KM-USA High Head, Standard and Tap Bolt.

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