Square head machine 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.
Cross arm or machine bolts are commonly supplied for the utility industry and included an added cone point.
Portland Bolt manufactures square bolts from 1/2" diameter through 2" diameter in most ASTM, AASHTO, and SAE specifications. Special tooling can be created to produce nonstandard head dimensions or bolt heads with your company's name and/or logo.
Standard Thread Lengths
Bolt lengths < 6": Thread length = (2 X diameter) + 1/4"
Bolt lengths > 6": Thread length = (2 X diameter) + 1/2
Squre Bolt Drawing:
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