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All dimensions in millimetres.
z according to IS : 1368-1967. Dimensions of ends of bolts and screws
x according to IS : 1369-1975. Dimensions of screws thread run-outs and undercuts
x1 = normal ≈ 2.5p thread run-out as per IS : 1369-1975.
| Nominal size d h13 | M 3 | (M 3.5) | M 4 | (M 4.5) | M 5 | M 6 | M 8 M 8 x 1 | M 10 M 10 x 1.25 | M 12 M 12 x 1.25 | (M 14) (M 14 x 1.5) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| b+2P – 0 | For / < 125 | 12 | 13 | 14 | 15 | 16 | 18 | 22 | 26 | 30 | 34 | |
| 125 </< 200 | – | – | – | – | – | – | – | 32 | 36 | 40 | ||
| b1(js16) | Type A | Nom | 3 | 3.5 | 4 | 4.5 | 5 | 6 | 8 | 10 | 12 | 14 |
| Max | 3.3 | 3.88 | 4.38 | 4.88 | 5.38 | 6.38 | 8.45 | 10.45 | 12.55 | 14.55 | ||
| Min | 2.7 | 3.12 | 3.62 | 4.12 | 4.62 | 5.62 | 7.55 | 9.55 | 11.45 | 13.45 | ||
| Type B | Nom | 4.5 | 5 | 6 | 7 | 7.5 | 9 | 12 | 15 | 18 | 21 | |
| Max | 4.88 | 5.38 | 6.38 | 7.45 | 7.95 | 9.45 | 12.55 | 15.55 | 18.55 | 21.65 | ||
| Min | 4.12 | 4.52 | 5.62 | 6.55 | 7.05 | 8.55 | 11.45 | 14.45 | 17.45 | 20.35 | ||
| Type C | Nom | – | – | 8 | – | – | – | 16 | – | 24 | – | |
| Max | – | – | 8.45 | – | – | – | 16.55 | – | 24.65 | – | ||
| Min | – | – | 7.55 | – | – | – | 15.45 | – | 23.35 | – | ||
| Nominal size d h13 | M 16 M 16 x 1.5 | (M 18) (M 18 x 1.5) | M 20 M 20 x 1.5 | (M 22) (M 22 x 1.5) | M 24 M 24 x 2 | M 27 (M 27 x 2) | M 30 M 30 x 2 | (M 33) (M 33 x 2) | M 36 M 36 x 3 | (M 39) (M 39 x 3) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| b+2P – 0 | For / < 125 | 38 | 42 | 46 | 50 | 54 | 60 | 66 | 78 | 78 | 84 | |
| 125 </< 200 | 44 | 48 | 52 | 56 | 60 | 65 | 72 | 78 | 84 | 90 | ||
| For l > 200 | 57 | 61 | 65 | 69 | 73 | 79 | 85 | 91 | f | 103 | ||
| b1(js16) | Type A | Nom | 16 | 18 | 20 | 22 | 24 | 27 | 30 | 33 | 36 | 39 |
| Max | 16.55 | 18.55 | 20.55 | 22.65 | 24.65 | 27.65 | 30.65 | 33.8 | 36.8 | 39.8 | ||
| Min | 15.45 | 17.45 | 19.35 | 21.35 | 23.35 | 26.35 | 29.35 | 32.2 | 35.2 | 38.2 | ||
| Type B | Nom | 24 | 27 | 30 | 33 | 36 | 40.5 | 45 | 49.5 | 54 | 57 | |
| Max | 24.65 | 27.55 | 30.65 | 33.8 | 36.8 | 41.3 | 45.8 | 50.3 | 54.95 | 57.95 | ||
| Min | 23.35 | 26.35 | 29.35 | 32.2 | 35.2 | 39.7 | 44.2 | 48.7 | 53.05 | 56.05 | ||
| Type C | Nom | 32 | – | 40 | – | – | – | – | – | – | – | |
| Max | 32.8 | – | 40.8 | – | – | – | – | – | – | – | ||
| Min | 31.2 | – | 39.2 | – | – | – | – | – | – | – | ||
Note :
Sizes shown within brackets are of second preference.
The run out in the metal end of the stud is to be considered only up to the last scratch of the thread and does not include any unthreaded extruded portion
adjacent to the run-out
Types :
Three types as follows:
Type A – b1 ≈ 1 d, suitable for use in steel.
Type B – b1 ≈ 1.5 d, suitable for use in cast Iron.
Type C – b1 ≈ 2 d, suitable for use in aluminium alloys.
| l | M 4 | M 8 M 8 x 1 | M 10 M 10 x 1.25 | M 12 M 12 x 1.25 | M 16 M 16 x 1.5 | M 20 M 20 x 1.5 |
| 25 | ||||||
| 30 | ||||||
| 40 | ||||||
| 60 | ||||||
| 80 | ||||||
| 100 | ||||||
| 120 | ||||||
| 140 | ||||||
| 160 | ||||||
| 200 |
Note :
All dimensions in millimetres.
Preferred lengths are between the stepped bold lines.
