สกรูหัวจมดำ เกลียวหุน (เกรด 12.9)
[ Hexagon Socket Head Cap Screws Grade 12.9 ]

| d (Diameter) | 3/16 | 1/4 | 5/16 | 3/8 | 7/16 | 1/2W | 1/2C | 5/8 | 3/4 | 7/8 | 1" | 1.1/4 | 1.1/2 |
| p (Pitch) | 24 | 20 | 18 | 16 | 14 | 12 | 13 | 11 | 10 | 9 | 8 | 7 | 6 |
| dk | 7.9 | 9.5 | 11.7 | 14.2 | 16.5 | 19 | 19 | 23.6 | 28.3 | 33 | 38 | 47 | 57 |
| k (Head Thickness) | 3/16 | 1/4 | 5/16 | 3/8 | 7/16 | 1/2 | 1/2 | 5/8 | 3/4 | 7/8 | 1" | 1.1/4 | 1.1/2 |
| s (Hex Key) | 5/32 | 3/16 | 1/4 | 5/16 | 5/16 | 3/8 | 3/8 | 1/2 | 5/8 | 3/4 | 3/4 | 7/8 | 1" |
| b | 25.4 | 28.45 | 31.75 | 35.05 | 38.1 | 38.1 | 44.45 | 50.8 |
| Length | 3/16" | 1/4" | 5/16" | 3/8" | 7/16" | 1/2" | 1/2" | 5/8" | 3/4" | 7/8" | 1" | 1.1/4" | 1.1/2" |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/8" | * | * | |||||||||||
| 1/2" | * | * | * | ||||||||||
| 5/8" | * | * | * | * | |||||||||
| 3/4" | * | * | * | * | * | ||||||||
| 1" | * | * | * | * | * | * | * | * | |||||
| 1.1/4" | * | * | * | * | * | * | * | * | |||||
| 1.1/2" | * | * | * | * | * | * | * | * | * | ||||
| 1.3/4" | * | * | * | * | * | * | * | * | * | ||||
| 2" | * | * | * | * | * | * | * | * | * | * | * | ||
| 2.1/2" | * | * | * | * | * | * | * | * | * | * | |||
| 3" | * | * | * | * | * | * | * | * | * | * | * | * | |
| 3.1/2" | * | * | * | * | * | * | * | * | * | * | * | * | |
| 4" | * | * | * | * | * | * | * | * | * | * | * | * | |
| 4.1/2" | * | * | * | * | * | * | * | * | * | * | * | ||
| 5" | * | * | * | * | * | * | * | * | * | * | * | ||
| 6" | * | * | * | * | * | * | * | * | * | * | * | ||
| 7" | * | * | * | * | * | * | * | * | |||||
| 8" | * | * | * | * | * | * | * | ||||||
| 9" | * | * | * | * | * | * | * | ||||||
| 10" | * | * | * | * | * | * | * | ||||||
| 11" | * | * | * | * | * | * | |||||||
| 12" | * | * | * | * | * | * |
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