Square head bolts

Square head bolts were the industry standard prior to hex bolts gaining prominence. Square bolts are now most commonly used for aesthetic purposes to provide a rustic look in a new structure or to match existing fasteners in an older structure. Square lag screws are also used for these purposes.

Square Head Bolts. We typically supply Square Head Bolts in to the Petro-Chemical and Construction Industries. We can offered hot forged Square Head Bolts from M6 - M48, and CNC bar-turned products from M4 - M200. We manufacture to International Standards, as well as customer's drawings. As well as standard Alloy and Stainless steels, we love working with the exotics, including Inconel, Super Duplex, Titanium and many more.

Common Standards Include:

•     DIN 478

•     ANSI B18.2.1

•     ASME B18.2.1

•     BS 2708

Common Standards Thread Forms:

•     Metric / Metric Fine

•     UNC / UNF / UNS

•     BSF / BSW

Typical Grades:

•     ISO 898-1 8.8 / 10.9 / 12.9

•     Stainless Steel 303/304 / 316 / 321 / 347

•     Petrochemical B7 / L7 / B16 / B8 / B8M

•     Super Duplex S32760 / F55 / F53

•     INCONEL 600 / 625 / 718 / 800 / 925

Stainless Steel SQUARE HEAD BOLTS  Material Grades