ASTM A183 Specification

This specification covers carbon steel track bolts and carbon steel nuts for use in conjunction with joint bars to connect rails in railroad track. Two grades of track bolts are defined: Grade 1, Low-Carbon, Untreated, primarily for industrial and mine track use. Grade 2, Heat-Treated, for general track use. Two grades of nuts are defined: Grade 1, Low-Carbon or Soft Steel, primarily for application on Grade 1 track bolts. Grade 2, Medium-Carbon, for general application on track bolts. The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

Chemical Composition


Element, %
Bolts Nuts
Grade 1 Grade 2 Grade 1 Grade 2
Heat-Cast Product Heat-Cast Product Heat-Cast Product Heat-Cast Product
Carbon, min or range 0.15 0.13 0.30 0.27 0.15 0.13 0.40–0.55 0.37–0.58
Phosphorus, max 0.04 0.050 0.04 0.050 0.12 A 0.04 0.050
Sulfur, max 0.33 A 0.06 0.070 0.33 A 0.06 0.070
Note:

A. Where rephosphorized or resulfurized material is applied, due to the degree to which phosphorus and sulfur segregate, check analyses for these elements are not technologically appropriate.