Ideal for environment's containing H2S, we stock commercial grade bolts which adhere to ASTM A193 B7M.

Description of Material

ASTM A193 B7M is an alloy steel used in specific applications within the oil and gas industries where the bolting could be exposed to the environments containing H2S. This includes but is not limited to; valves, flanges and fittings in general and high-pressure applications piping applications. Using ASTM A193 B7 base material it is further tempered to achieve the below properties.

LoneStar Fasteners Europe offer ASTM A193 B7M in commercial grades, covering the basic requirements of ASTM A193, but can also offer with supplementary and additional requirements of the standard or client preference to international accredited certification bodies such as API 20E BSL 1/2/3 or OEM specific additional requirements.

ASTM A193 B7M: Forms

  LoneStar Manufacture 
Stud Bolts
Hexagon Headed Bolting
Socket Headed Bolting
Double Ended and Waisted Studs
Associated OEM Parts

ASTM A193 B7M: Sizes and Threads 

  LoneStar Manufacture 
Metric Coarse
Metric Fine
Imperial UNC
Imperial 8UN
Imperial UNF
Metric sizes available Metric sizes available Up to M100
Imperial sizes available Imperial sizes available Up to 6.00″

ASTM A193 B7M: Chemical Composition

Carbon 0.38-0.48 %
Manganese 0.75-1.00 %
Phosphorus 0.35 % Max
Sulphur 0.03 % Max
Silicon 0.04
Chromium 0.80-1.10 %
Molybdenum 0.15-0.25 %

Mechanical Properties

4″ and under 100 80 18 50 99 HRB Over 4” to 7” 100 75 18 50 99 HRB
Tensile Strength Min, Ksi 100 100
Yield Strength  min, 0.2% offset Ksi 80 75
Elongation in min% 18 18
Reduction of Area min% 50 50
Hardness Max 99 HRB 99 HRB


Not Sure What You Are Looking For?