ASTM A193 Grade B7/B7M Double end stud bolt

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Product Detail

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ASTM A193 Grade B7/B7M is alloy steel, AISI 4040/4142 quenched and tempered.


Chemical composition: C: 0.37 ~0.49; Si: 0.15~0.35; Mn:0.65~1.10; S: ≤0.035; P: ≤0.035; Cr:0.75~1.20; Mo: 0.15~0.25

Thread sizes:  M16~M56

Thread screw: Cold thread

Surface Treatment: Oil, Grease, Dacromet, Zinc coating,Paint, tape, fabric, Water-proof Paper, Box.

Place of Origin: China

Equivalent grades conversion

Standard Grade
GB 42CrMo
AISI 4140
BS 708M40, 708A42, 709M40
NF 40CD4, 42CD4
DIN 41CrMo4, 42CrMo4, 1.7225
ISO 683, 1 3
SAE 4140H, 4140RH

Mechanical composition

Tensile strength: min 125 ksi

Yield strength : min 105 ksi

Elongation rate: min 16%

Reduction rate: min 50%

Impact energy: akv min 63J

Hardness: C35


Formula reference

Round bar weight KG =  length(m) x radius(mm)² x 0.00617



LT Group provide heat-treatment, cold thread, lab services according to customer’s technical requirements. Please send properties requriements to [email protected]. We will give positive response within one working day.


Production Line                                                                                                

production line

Quality Control                                                                                                   

Quality Control


Achieving the ISO 9001:2008 Certification is just one example of our Products’ dedication to quality and continuous improvement. Each employee is responsible for understanding company expectations and adhering to the procedures of our Quality Management System.
Our Products ensures customers receive the material ordered with accurate supporting paperwork. Customers can count on proper documentation, on-time performance and effective follow-up.



We will continually improves and expands the quantity and quality of our product which exactly meet customers need. We do whatever it takes to make our clients happy.
We will develop long-term commercial and technical partnerships with customers. And we are committed to continual quality improvement of all internal processes. The success of our quality program is affirmed by our strong customer retention rate.

Contact [email protected] for a free quote, we will reply within one working day.


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