ASTM A307 / 307M GR A & B

Description

Description

• We supply ½” to 4” diameter (Inch Series) & M6 to M64 diameter(Metric Series) in various length normal and heavy hex bolts.
• Dimensions as per ASME B18.2.1 / ASME B18.2.3.6M .
• Material and physical properties per ASTM – A307 Grade B
• Fasteners in other material grades and finishes available with us. Contact us for more information.

MKM Fasteners is a trusted name in the fastener industry, offering a reliable range of ASTM A307 / 307M Grade A & B Hexagon Bolts made from high-quality carbon steel. These bolts are widely used in general-purpose applications, including construction, fabrication, light structural work, and machinery assemblies.

We supply sizes ranging from ½” to 4” (Inch Series) and M6 to M64 (Metric Series), covering a wide variety of project needs. Available in both normal and heavy hex designs, our bolts ensure a strong and secure fit in any standard bolting application.

Manufactured to meet dimensional standards ASME B18.2.1 and ASME B18.2.3.6M, MKM Fasteners ensures precision engineering and consistent quality across every product. These hex bolts conform to ASTM A307 Grade A and B, with Grade A suited for general use and Grade B ideal for cast iron flanges and piping systems requiring higher strength.

Each bolt is produced under strict quality control to guarantee excellent mechanical performance and durability. While our standard offering includes carbon steel, we also provide custom material grades and surface finishes upon request, including galvanized and coated options for enhanced corrosion resistance.

Whether you’re sourcing for a small-scale job or a large industrial project, MKM Fasteners delivers dependable fastening solutions that meet international standards. Our customer-focused approach, fast turnaround times, and premium-grade materials make us the go-to choice for engineers, contractors, and project managers alike.

Choose MKM Fasteners for ASTM A307 Grade A & B Hex Bolts—where strength, precision, and trust come standard.