Manufactures & Suppliers of Pipes, Tubes, Flanges, Pipe Fitting & Fasteners

Grade B7M is widely used in applications such as petroleum, sewage, water treatment, and chemical construction. The ASTM standard encompasses both alloy steel and stainless steel bolting materials designed for high-temperature or high-pressure service. This specification covers fasteners intended for use in pressure vessels, valves, flanges, and fittings. While this material is typically available in national coarse (UNC) thread pitches, traditional applications specify threads at 8 threads per inch (tpi) for diameters exceeding one inch.

ASTM A193 Gr. B7M Stud Bolt, ASTM A193 Gr. B7M Bolt, ASTM A193 Gr. B7M Nuts, ASTM A193 Gr. B7M Fasteners Supplier and Manufacturer in Mumbai, India

ASTM A193 B7M bolts are part of a specification that addresses bolts with high tensile strength and hardness. The minimum yield strength required is 75 ksi, while the minimum tensile strength is set at 100 ksi, with a hardness of 99 HRB. Natron is a leading manufacturer and supplier of various types of ASTM A193 Grade B7M bolts, available in different dimensions and standards.


ASTM A193 Grade B7 bolts are made from chromium-molybdenum steel, offering exceptional mechanical properties, including high tensile strength and abrasion resistance, as well as resistance to various heat-related applications. Typically, these fasteners undergo quenching and tempering to enhance their performance characteristics, allowing them to be used in high-temperature environments up to 450°C (840°F).

ASTM A193 Gr. B7M Fasteners Chemical Composition

Element Alloy Steel
Chromium Molybdenum SteelA
CompositionB, %
Carbon 0.37 - 0.49C
Manganese 0.65 - 1.10
Phosphorus 0.035 max
Sulfur 0.040 max
Silicon 0.15 - 0.35
Chromium 0.75 - 1.20
Molybdenum 0.15 - 0.25

ASTM A193 Gr. B7M Fasteners Mechanical Properties

Diameter, inch. Tensile Strength,
min, ksi
Yield Strength,
min, 0.2% offset,
ksi
Elongation
in 4D,
min, %
Reduction
of Area,
min, %
Hardness,
max
4 and under 100 80 18 50 235 HBW or 99 HRB
over 4 to 7, inclusive 100 75 18 50 235 HBW or 99 HRB