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- Manufacturing and exporting Sucket (Allen) bolts and Nuts
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American Standard Grade 8 bolt that is illustrated with 6 short lines on top of the bolt head, is the strongest bolt manufactured providing 150 ksi strength, having heat treatment process on its rod prior to production, and is very commonly used in heavy industries including military, aerospace, off road vehicles, tank manufacturing,… Grade 8 bolts are usually manufactured in sizes varying from 1 / 4 to 1 - 1 / 2 inch.
| Hardness Max - Rockwell | Hardness Min - Rockwell | Tensile Min ksi | Yield Min ksi | Proof Load ksi | Size in | Bolt Grade |
|---|---|---|---|---|---|---|
| C35 | C24 | 120 | 92 | 85 | 1/2 -1 | ASTM A 325 |
| C31 | C19 | 105 | 81 | 74 | 1 1/8 -1 1/2 | ASTM A 325 |
| C39 | C33 | 150 | 130 | 120 | 1/4 - 1 1/2 | SAE J429 Grade 8 |
