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Hex nut (excerpt from JIS B 1181:2014)
- Hex nut -Style 1- Shape and Dimensions of Coarse Thread (First Choice)
- Hex Nut -Style 2- Shape and Dimensions of Coarse Thread
Hex Nut -Style 1- Shape and Dimensions of Coarse Thread (First Choice)
Notes
- a) Nuts shall not be washer-faced unless otherwise specified.
- b) β=15°～30°
- c) Θ=90°～120°
Unit: mm
| Nominal thread size D | M1.6 | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M16 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P a) | 0.35 | 0.4 | 0.45 | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | |
| c | Maximum | 0.20 | 0.20 | 0.30 | 0.40 | 0.40 | 0.50 | 0.50 | 0.60 | 0.60 | 0.60 | 0.80 |
| Min. | 0.10 | 0.10 | 0.10 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.20 | |
| da | Maximum | 1.84 | 2.30 | 2.90 | 3.45 | 4.60 | 5.75 | 6.75 | 8.75 | 10.80 | 13.00 | 17.30 |
| Min. | 1.60 | 2.00 | 2.50 | 3.00 | 4.00 | 5.00 | 6.00 | 8.00 | 10.00 | 12.00 | 16.00 | |
| dw | Min. | 2.40 | 3.10 | 4.10 | 4.60 | 5.90 | 6.90 | 8.90 | 11.60 | 14.60 | 16.60 | 22.50 |
| e | Min. | 3.41 | 4.32 | 5.45 | 6.01 | 7.66 | 8.79 | 11.05 | 14.38 | 17.77 | 20.03 | 26.75 |
| m | Maximum | 1.30 | 1.60 | 2.00 | 2.40 | 3.20 | 4.70 | 5.20 | 6.80 | 8.40 | 10.80 | 14.80 |
| Min. | 1.05 | 1.35 | 1.75 | 2.15 | 2.90 | 4.40 | 4.90 | 6.44 | 8.04 | 10.37 | 14.10 | |
| mw | Min. | 0.80 | 1.10 | 1.40 | 1.70 | 2.30 | 3.50 | 3.90 | 5.20 | 6.40 | 8.30 | 24.00 |
| s | Standard dimensions = maximum | 3.20 | 4.00 | 5.00 | 5.50 | 7.00 | 8.00 | 10.00 | 13.00 | 16.00 | 18.00 | 24.00 |
| Min. | 3.02 | 3.82 | 4.82 | 5.32 | 6.78 | 7.78 | 9.78 | 12.73 | 15.73 | 17.73 | 23.67 | |
Notes
- a) P refers to the pitch of the screw.
- *M1.6 and M2.5, which were not included in the former standard JIS B 1181 (1993), are added.
- *Some of the M10 and M12 hex nuts currently in circulation conform to the old JIS for the width across flats s.
Hex Nut -Style 2- Shape and Dimensions of Coarse Thread
Notes
- a) Nuts shall not be washer-faced unless otherwise specified.
- b) β=15°～30°
- c) Θ=90°～120°
Unit: mm
| Nominal thread size D | M5 | M6 | M8 | M10 | M12 | (M14) a) | M16 | |
|---|---|---|---|---|---|---|---|---|
| P b) | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | |
| c | Max. | 0.50 | 0.50 | 0.60 | 0.60 | 0.60 | 0.60 | 0.80 |
| da | Max. | 5.75 | 6.75 | 8.75 | 10.80 | 13.00 | 15.10 | 17.30 |
| Min. | 5.00 | 6.00 | 8.00 | 10.00 | 12.00 | 14.00 | 16.00 | |
| dw | Min. | 6.90 | 8.90 | 11.60 | 14.60 | 16.60 | 19.60 | 22.50 |
| e | Min. | 8.79 | 11.05 | 14.38 | 17.77 | 20.03 | 23.36 | 26.75 |
| m | Max. | 5.10 | 5.70 | 7.50 | 9.30 | 12.00 | 14.10 | 16.40 |
| Min. | 4.80 | 5.40 | 7.14 | 8.94 | 11.57 | 13.40 | 15.70 | |
| mw | Min. | 3.84 | 4.32 | 5.71 | 7.15 | 9.26 | 10.70 | 12.60 |
| s | Standard dimensions = max. | 8.00 | 10.00 | 13.00 | 16.00 | 18.00 | 21.00 | 24.00 |
| Min. | 7.78 | 9.78 | 12.73 | 15.73 | 17.73 | 20.67 | 23.67 | |
Notes
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