| Type | Range of nominal diameter d of thread | Corresponding International Standard (informative) | |||
|---|---|---|---|---|---|
| Designation | Pitch of thread | Product Grade | |||
| Nominal diameter hexagon head bolt |
Coarse thread | A | d = 1.6 mm to 24 mm [nominal length l is up to and including 10d or 150 mma)] | ISO 4014 | |
| B | d = 1.6 mm to 24 mm [nominal length l is over 10d or 150 mm a)] |
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| d = 27 mm to 64 mm | |||||
| C | d = 5 mm to 64 mm | ISO 4016 | |||
| Fine pitch thread | A | d = 8 mm to 24 mm [nominal length l is up to and including 10d or 150 mm a)] |
ISO 8765 | ||
| B | d = 8 mm to 24 mm [nominal length l is over 10d or 150 mm a)] |
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| d = 27 mm to 64 mm | |||||
| Hexagon head screw bolt | Coarse thread | A | d = 1.6 mm to 24 mm [nominal length l is up to and including 10d or 150 mm a)] |
ISO 4017 | |
| B | d = 1.6 mm to 24 mm [nominal length l is over 10d or 150 mm a)] |
||||
| d = 27 mm to 64 mm | |||||
| C | d = 5 mm to 64 mm | ISO 4018 | |||
| Fine pitch thread | A | d = 8 mm to 24 mm [nominal length l is up to and including 10d or 150 mm a)] |
ISO 8676 | ||
| B | d = 8 mm to 24 mm [nominal length l is over 10d or 150 mm a)] |
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| d = 27 mm to 64 mm | |||||
| Pitch diameter hexagon head bolt |
Coarse thread | B | d = 3 mm to 20 mm | ISO 4015 | |
| Note a) Whichever is the shorter. | |||||