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Heavy Hex Bolts


Heavy Hex Bolts Manufacturers & Suppliers – Buy Top Quality Heavy Hex Bolts

Metline specializes in the manufacture of heavy hex bolts as per ASTM A193, ASTM A320, ASTM A325, ASTM A307B, and ASTM A490. We also offer heavy hex bolts in materials such as ASTM A193 Grade B8M, Inconel, Monel, Titanium and Other Special Alloys.

Our heavy bolt stock and production range includes size 1/2” to 3″ diameter. We can also offer custom sizes, as per requirements from our customers. We manufacture heavy hex bolts in Stainless Steels (ASTM A193), Alloy Steels, Carbon Steel (ASTM A307 Grade B) and Structural Steels (ASTM A325 & A490). ASTM A193 heavy hex bolts are manufactured for use in high heat conditions, while ASTM A320 standard covers extremely low temperature conditions. Heavy hex bolts are generally used in high temperature or high pressure applications as well as bridges, highway, buildings and other construction projects. Heavy hex bolts have larger and thicker heads than regular or standard hex bolts, and are available in Plain, Zinc Plated, Hot Dipped Galvanized, Black Oxide, Silicone Bronze, Yellow Zinc, Aluminum, SS 316, and SS 304.

Additional information


Heavy hex bolts have a larger head than a standard hex bolt. They are used for bridges, highway, buildings and other construction projects.

Manufacturing Standards

ASTM 193, ASTM 320, ASTM 325, ASTM 490, ASTM 307, ISO:898 / IS-1367

ASTM 193

B5, B6,B7, B7M, B16
B8M CLASS 1 & 2
B8 CLASS 1 & 2
B8C, B8T

ASTM 320

L7, L7A, L7B, L7C, L43
B8 CLASS 1 & 2B8M CLASS 1 & 2
B8F, B8T

ASTM 325

TYPE – 1, 2, 3

ASTM 490

TYPE – 1, 2, 3

ASTM 307

GR – A, B

ISO:898 / IS-1367

GR – 4.6, 5.6, 8.8, 10.9, 12. 9

Diameter Size

M02 to M160


30 mm to 2000 mm, Custom Lengths


Mild Steel, Stainless Steel, Carbon Steel, Alloy Steel, Brass, Copper, Duplex & Super Duplex Nuts, Aluminium, Hastelloy, Incoloy, Inconel, Monel.

Surface Finish

Blackening, Cadmium Zinc plated, Galvanized, Hot Dip Galvanized, Nickel Plated, Buffing


Metric, BSW, BSF, UNC, UNF, and as per costumers requirement

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