About Hex Head Screws and Bolts
More
High-Strength Grade 8 Steel Hex Head Screws
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. For quick identification, their head is marked with six radial lines. Length is measured from under the head.
Zinc yellow-chromate plated steel screws are a good choice for most applications. They resist corrosion in wet environments.
Match the thread spacing of mating components. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance.
Screws that meet ASME specifications are made to strict dimensional standards. Screws that meet SAE specifications comply with testing standards for material quality.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Wd. | Ht. | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc Yellow-Chromate Plated Grade 8 Steel | ||||||||||
1/2"-28 | ||||||||||
| 1 1/4" | Fully Threaded | __ | Extra Fine | 3/4" | 5/16" | 150,000 | ASME B18.2.1, SAE J429 | 1 | 92620A126 | 000000 |
| 1 1/2" | Fully Threaded | __ | Extra Fine | 3/4" | 5/16" | 150,000 | ASME B18.2.1, SAE J429 | 1 | 92620A127 | 00000 |
| 2" | Partially Threaded | 1 1/4" | Extra Fine | 3/4" | 5/16" | 150,000 | ASME B18.2.1, SAE J429 | 1 | 92620A128 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/4" | Extra Fine | 3/4" | 5/16" | 150,000 | ASME B18.2.1, SAE J429 | 1 | 92620A129 | 00000 |
| 3" | Partially Threaded | 1 1/4" | Extra Fine | 3/4" | 5/16" | 150,000 | ASME B18.2.1, SAE J429 | 1 | 92620A131 | 00000 |