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ASME B18.31.2 Inch Series Threaded Rods Dimensions
Inch Series Threaded Rod Dimensions and Length Standards
For 316 stainless inch-series threaded-rod material, see ASTM A193 B8M Class 1, Class 2, or the A193/A193M specification overview.
ASME B18.31.2 standard specifies the dimensions and requirements for inch series threaded rods, widely used in construction, piping, and mechanical systems. It includes details on thread specifications, rod lengths, and tolerances. This page provides accurate ASME B18.31.2 dimensions, along with size charts and engineering specifications for practical use.
Inch Series Threaded Rod Dimensions and Tolerances
ASME B18.31.2 Inch Series Threaded Rods Dimensions (Inch)
| Nominal Size |
Diameter, D |
Nut End Minimum Full Thread
Length, Bmin |
Minimum Body Diameter, DS | ||||
|---|---|---|---|---|---|---|---|
| L ≤ 10 | 10 < L ≤ 16 | L > 16 | UNC and NC-5 HF Threads |
UNF Threads |
8UN Threads |
||
| ¼ | 0.2500 | 0.750 | 1.000 | 1.500 | 0.241 | 0.243 | … |
| 5/16 | 0.3125 | 0.875 | 1.125 | 1.625 | 0.303 | 0.304 | … |
| 3/8 | 0.3750 | 1.000 | 1.250 | 1.750 | 0.364 | 0.367 | … |
| 7/16 | 0.4375 | 1.125 | 1.375 | 1.875 | 0.426 | 0.428 | … |
| ½ | 0.5000 | 1.250 | 1.500 | 2.000 | 0.488 | 0.491 | … |
| 9/16 | 0.5625 | 1.375 | 1.625 | 2.125 | 0.550 | 0.552 | … |
| 5/8 | 0.6250 | 1.500 | 1.750 | 2.250 | 0.611 | 0.615 | … |
| ¾ | 0.7500 | 1.750 | 2.000 | 2.500 | 0.735 | 0.739 | … |
| 7/8 | 0.8750 | 2.000 | 2.250 | 2.750 | 0.859 | 0.863 | … |
| 1 | 1.0000 | 2.250 | 2.500 | 3.000 | 0.983 | 0.987 | … |
| 1⅛ | 1.1250 | 2.500 | 2.750 | 3.250 | 1.106 | 1.112 | 1.108 |
| 1¼ | 1.2500 | 2.750 | 3.000 | 3.500 | 1.231 | 1.237 | 1.233 |
| 1⅜ | 1.3750 | 3.000 | 3.250 | 3.750 | 1.354 | 1.362 | 1.358 |
| 1½ | 1.5000 | 3.250 | 3.500 | 4.000 | 1.479 | 1.487 | 1.483 |
| 1⅝ | 1.6250 | 3.500 | 3.750 | 4.250 | … | … | 1.608 |
| 1¾ | 1.7500 | 3.750 | 4.000 | 4.500 | 1.727 | … | 1.733 |
| 1⅞ | 1.8750 | 4.000 | 4.250 | 4.750 | … | … | 1.858 |
| 2 | 2.0000 | 4.250 | 4.500 | 5.000 | 1.975 | … | 1.983 |
| 2¼ | 2.2500 | 4.750 | 5.000 | 5.500 | 2.225 | … | 2.233 |
| 2½ | 2.5000 | 5.250 | 5.500 | 6.000 | 2.473 | … | 2.483 |
| 2¾ | 2.7500 | 5.750 | 6.000 | 6.500 | 2.723 | … | 2.733 |
| 3 | 3.0000 | ... | 6.500 | 7.000 | 2.973 | … | 2.982 |
| 3¼ | 3.2500 | ... | 7.000 | 7.500 | 3.223 | … | 3.232 |
| 3½ | 3.5000 | ... | 7.500 | 8.000 | 3.473 | … | 3.482 |
| 3¾ | 3.7500 | ... | 8.000 | 8.500 | 3.723 | … | 3.732 |
| 4 | 4.0000 | ... | 8.500 | 9.000 | 3.973 | … | 3.982 |
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