ASTM A193 B7 2h Stud Bolt and Nut


ASTM A193 B7 2h Stud Bolt and Nut




ASTM A193 B7 is a Bolting specification for medium-high temperature applications. It is a heat treated Chromium Molybdenum steel and is considered for applications up to 450°C (840°F).

Steel is manufactured via Electric Arc Furnace, continuously cast followed by heat treatment and Bright conversion. It is typically used for the manufacture of Bolts, Fasteners, Studs and Studbolts in the Petrochemical industry. Available Drawn or Turned depending on the size in both Metric and Imperial sizes in standard and Thread Rolling Diameters. Typical stock size range 8mm to 4in Diameter in B7/L7 and 110mm to 130mm Diameter B7 only.




Chemical Composition B7/L7

Element B7 (AISI 4140) L7 (AISI 4140)
Carbon 0.37 – 0.49% 0.37 – 0.49%
Manganese 0.65 – 1.10% 0.65 – 1.10%
Phosphorus, max 0.035% 0.035%
Sulfur, max 0.040% 0.040%
Silicon 0.15 – 0.35% 0.15 – 0.35%
Chromium 0.75 – 1.20% 0.75 – 1.20%
Molybdenum 0.15 – 0.25% 0.15 – 0.25%


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