18 years professional hardware manufacturer - JM Hardware
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18 years professional hardware manufacturer - JM Hardware
Standar for Bolt Grade Bolt Size:
| Standar for Bolt | Grade | Bolt Size | Tension Stength | Yield Strength | Enlogation | Hardness | Head Marking | |
| in. | ksi | ksi | % | Surface 30N max | Core Rockwell | |||
| SAE J429 | GR.2 | 1/4 to 3/4 | 74 | 57 | 18 | / | B80-100 | / |
| over 3/4 to 1-1/2 | 60 | 36 | 18 | / | B70-100 | |||
| GR.5 | 1/4 to 1 | 120 | 92 | 14 | 54 | C25-34 |  | |
| over 1 to 1-1/2 | 105 | 81 | 14 | 50 | C19-30 | |||
| GR.8 | 1/4 to 1-1/2 | 150 | 130 | 12 | 58.6 | C33-39 |  | |
Since our establishment in 2006, JM has been adhering to the mission of creating maximum value for customers by providing differentiated services, building a stage for employees to succeed, and making a positive contribution to the society.
