Metric Standards
Metric Hex Head Cap Screws have hexagonal heads with a washer-face beneath the head and machine threads. They’re great for use in a tapped hole or with a nut and are commonly used in applications where tight tolerances are required. The most common grades for Metric Hex Head Cap Screws are 8.8 and 10.9.
| F | G | H | Lt | ||
|---|---|---|---|---|---|
| Size | Width Across Flats | Width Across Corners Min. | Head Height | Thread Length for Bolt Length | |
| 120mm & Shorter | 125mm-200mm | ||||
| M5 | 8 | 8.79 | 3.5 | 16 | 22 |
| M6 | 10 | 11.05 | 4.0 | 18 | 24 |
| M8 | 13 | 14.38 | 5.3 | 22 | 28 |
| M10 | 17 | 18.90 | 6.4 | 26 | 32 |
| M12 | 19 | 21.10 | 7.5 | 30 | 36 |
| M14 | 22 | 24.49 | 8.8 | 34 | 40 |
| M16 | 24 | 26.75 | 10.0 | 38 | 44 |
| M18 | 27 | 30.14 | 11.5 | 42 | 48 |
| M20 | 30 | 33.53 | 12.5 | 46 | 52 |
| M22 | 32 | 35.72 | 14.0 | 50 | 56 |
| M24 | 36 | 39.98 | 15.0 | 54 | 60 |
| M27 | 41 | 45.20 | 17.0 | 60 | 66 |
| M30 | 46 | 50.85 | 18.7 | 66 | 72 |
Grade 8.8 Hex Head Cap Screws
Grade 8.8 Hex Cap Screws are made from medium carbon steel and heat-treated. They are considered equivalent to US Grade 5.
Grade 10.9 Hex Head Cap Screws
Grade 10.9 Hex Head Cap Screws are made of heat-treated high alloy steel. They’re also stranger than Grade 8.8 screws and just as strong as US Grade 8.
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