| Technology | |||
 Screws |
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| Stamping Parts |
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| Machined Parts |
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| Pins |
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| Bolts |
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| Nuts |
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| Washers |
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| Rivets |
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| Hex Wrench |
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| Metric Threads Specification |
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| Screw Basic Knowledge |
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| Plastic & Nylon Parts |
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Technology
Combination for Flat Washer , Bolt , Nut and Screw
| Washer | Hardness/HV | 100 | 200 | 300 | |
| Product Grade | C | A | A | ||
| Bolt , Nut & Screw | Prodct Grade | A | NG | OK | OK |
| B | NG | OK | OK | ||
| C | OK | NG | NG | ||
| Bolt & Screw | Property Grade | 6.8 | OK | OK | OK |
| 8.8 | NG | OK | OK | ||
| 9.8 & 10.9 | NG | NG | OK | ||
| 12.9 | NG | NG | NG | ||
| Nut | Property Grade | 6 | OK | OK | OK |
| 8 | NG | OK | OK | ||
| 9 & 10 | NG | NG | OK | ||
| 12 | NG | NG | NG | ||
| SS Bolt , Nut & Screw | __ | OK |
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Mark : " NG" stands for Not Go , washer , nut , bolt and screw can not be combined to work under given grades .
" OK" stands for washer , nut and screw can combine to work under given grades .
