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ASME B18.31.1M Metric Threaded Rods Dimensions and Specifications
Standard Metric Threaded Rod Dimensions and Tolerances
For 316 stainless metric threaded-rod material, see ASTM A193 B8M Class 1, Class 2, or the A193/A193M specification overview.
ASME B18.31.1M standard covers the dimensional requirements for metric threaded rods, commonly used in fastening, anchoring, and structural applications. It defines thread forms, tolerances, and length specifications to ensure consistency and performance. On this page, you can explore complete ASME B18.31.1M threaded rod dimensions, including metric size charts and technical data.
Metric Threaded Rod Dimensions and Length Tolerances
ASME B18.31.1M Metric Threaded Rods Dimensions (mm)
| Nominal Size Diameter, D |
Thread Length, B | UMax. = 2P |
Nominal Length, L | Body Diameter, DS | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LT ≤ 250 | 250 < LT ≤ 400 | LT > 400 | Max. | Min. (by Length) | ||||||||
| Min. | Max. | Min. | Max. | Min. | Max. | Range | Incr. | LT ≤ 150 | LT > 150 | |||
| M1.6 | 9.2 | 9.9 | - | - | - | - | 0.7 | 25-50 | 5 | 1.60 | 1.29 | 1.29 |
| M2 | 10 | 10.8 | - | - | - | - | 0.8 | 25-50 | 5 | 2.00 | 1.65 | 1.65 |
| M2.5 | 11 | 11.9 | - | - | - | - | 0.9 | 30-50 | 5 | 2.50 | 2.12 | 2.12 |
| M3 | 12 | 13 | - | - | - | - | 1 | 30-50 | 5 | 3.00 | 2.58 | 2.58 |
| M4 | 14 | 15.4 | - | - | - | - | 1.4 | 35-90 | 5 | 4.00 | 3.43 | 3.43 |
| M5 | 16 | 17.6 | - | - | - | - | 1.6 | 40-90 | 5 | 5.00 | 4.36 | 4.36 |
| M6 | 18 | 20 | 24 | 26 | - | - | 2 | 50-90 100-160 |
5 10 |
6.00 | 5.82 | 5.70 |
| M8 | 18 | 20.5 | 26.5 | 24 | - | - | 2.5 | 50-90 ≥ 100 |
5 10 |
8.00 | 7.78 | 7.64 |
| M10 | 26 | 29 | 32 | 35 | 45 | 48 | 3 | 60-160 ≥ 180 |
10 20 |
10.00 | 9.78 | 9.64 |
| M12 | 30 | 33.5 | 36 | 39.5 | 49 | 52.5 | 3.5 | 60-160 ≥ 180 |
10 20 |
12.00 | 11.73 | 11.57 |
| M14 | 34 | 38 | 40 | 44 | 53 | 57 | 4 | 80-160 ≥ 180 |
10 20 |
14.00 | 13.73 | 13.57 |
| M16 | 38 | 42 | 44 | 48 | 57 | 61 | 4 | 90-160 ≥ 180 |
10 20 |
16.00 | 15.73 | 15.57 |
| M20 | 46 | 51 | 52 | 57 | 65 | 70 | 5 | 100-160 > 180 |
10 20 |
20.00 | 19.67 | 19.48 |
| M24 | 54 | 60 | 60 | 66 | 73 | 79 | 6 | 130-160 ≥ 180 |
10 20 |
24.00 | 23.67 | 23.48 |
| M30 | 66 | 73 | 72 | 79 | 85 | 92 | 7 | 150-160 ≥ 180 |
10 20 |
30.00 | - | 29.48 |
| M36 | 78 | 86 | 84 | 92 | 97 | 105 | 8 | ≥ 200 | 20 | 36.00 | - | 35.38 |
| M42 | 90 | 99 | 96 | 105 | 109 | 118 | 9 | ≥ 240 | 20 | 42.00 | - | 41.38 |
| M48 | - | - | 108 | 118 | 121 | 131 | 10 | ≥ 280 | 20 | 48.00 | - | 47.38 |
| M56 | - | - | 124 | 135 | 137 | 148 | 11 | ≥ 300 | 20 | 56.00 | - | 55.26 |
| M64 | - | - | 140 | 152 | 153 | 165 | 12 | ≥ 340 | 20 | 64.00 | - | 63.26 |
| M72 | - | - | 156 | 168 | 169 | 181 | 12 | ≥ 380 | 20 | 72.00 | - | 71.26 |
| M80 | - | - | 172 | 184 | 185 | 197 | 12 | ≥ 400 | 20 | 80.00 | - | 79.26 |
| M90 | - | - | - | - | 205 | 217 | 12 | ≥ 440 | 20 | 90.00 | - | 89.13 |
| M100 | - | - | - | - | 225 | 237 | 12 | ≥ 480 | 20 | 100.00 | - | 99.13 |
ASME B18.31.1M Metric Threaded Rods Length Tolerances (mm)
| Nominal Length | Tolerance | |
|---|---|---|
| Over | Through | |
| 6 | 10 | ± 0.29 |
| 10 | 18 | ± 0.35 |
| 18 | 30 | ± 0.42 |
| 30 | 50 | ± 0.50 |
| 50 | 80 | ± 0.95 |
| 80 | 120 | ± 1.10 |
| 120 | 180 | ± 1.25 |
| 180 | 250 | ± 1.45 |
| 250 | 315 | ± 1.60 |
| 315 | 400 | ± 1.80 |
| 400 | 500 | ± 2.00 |
| >500 | ... | ± 5.00 |
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