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About Hex Head Screws and Bolts
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High-Strength Grade 8 Steel Hex Head Screws
Fully Threaded
Partially Threaded
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. Grade 8 steel hex head screws are marked with six radial lines. Length is measured from under the head.
Zinc-flake-coated steel screws are about five times as corrosion resistant as zinc yellow-chromate plated screws and have good resistance to salt water and acids. Also known as ultra coat and armor coat. To maintain corrosion resistance, use these screws with zinc-flake-coated nuts and washers.
Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch.
Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance.
Screws that meet ASTM A354BD or SAE J429 comply with specifications and testing requirements for material quality.
Screws that meet ASME B18.2.1 or ASME B18.6.3 comply with specifications for dimensional standards.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Wd. | Ht. | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Flake-Coated Grade 8 Steel | ||||||||||
1/4"-20 | ||||||||||
| 3/8" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 100 | 000000000 | 000000 |
| 1/2" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 100 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 100 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1 1/8" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 3" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 0000 |
| 5" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
1/4"-28 | ||||||||||
| 1/2" | Fully Threaded | __ | Fine | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Fine | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 2" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 3" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 4" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 0000 |
5/16"-18 | ||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 7/8" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1 1/8" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 0000 |
| 3" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
| 4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
| 5" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
5/16"-24 | ||||||||||
| 3/4" | Fully Threaded | __ | Fine | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Fine | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Fine | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 2" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 0000 |
| 3" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
3/8"-16 | ||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 7/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 1 1/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 50 | 000000000 | 00000 |
| 1 3/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 1 5/8" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 0000 |
| 2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 25 | 000000000 | 00000 |
| 2 3/8" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 0000 |
| 2 5/8" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
| 3" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
| 3 1/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
| 3 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
| 3 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
| 4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 10 | 000000000 | 00000 |
| 4 1/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 5 | 000000000 | 00000 |
| 4 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 5 | 000000000 | 00000 |
| 4 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 5 | 000000000 | 00000 |
| 5" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 5 | 000000000 | 00000 |
| 5 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 5 | 000000000 | 00000 |
| 6" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 5 | 000000000 | 00000 |
| 6 1/2" | Partially Threaded | 1 1/4" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 5 | 000000000 | 00000 |
| 7" | Partially Threaded | 1 1/4" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 5 | 000000000 | 00000 |
| 8" | Partially Threaded | 1 1/4" | Coarse | 9/16" | 15/64" | 150,000 | ASME B18.2.1, SAE J429 | 1 | 000000000 | 0000 |