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ASME B18.31.1M Metric Threaded Rods Dimensions and Specifications
Standard Metric Threaded Rod Dimensions and Tolerances
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 rods per ASME B18.31.1M are continuous-thread fasteners cut from coil stock or bar, used as anchor-bolt blanks, double-end studs for flanged-joint assembly, and adjustment hardware in tensioned-rod systems. Diameter range M6 through M100 in 304 stainless ASTM A193 Grade B8 material. Procurement note: confirm thread fit class (6g/6H standard, 4h/5H for precision) and end-condition (cut, chamfered, or rolled) on the inquiry.
ASME B18.31.1M Dimensional Tables for ASTM A193 B8 Metric Threaded Rods
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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