ANSI B18.2.1 Square Bolt

Leader-Fastener® ANSI B18.2.1 Square Bolt has a square style head, the top of which is fully chamfered with the diameter of chamfer circle equal to the maximum width across flats, F. Compared to hex bolt, the square head bolt is not so prevalent in modern engineering. It is usually required during refurbishment of old project. Square Head Bolts were once the most common form of bolt, until they were replaced by hex head bolts. They are covered under ANSI Standard B18.2.1 and are now most commonly used for aesthetic purposes to provide a rustic look .

Square head bolt design enables an easier wrench grip for nut tightening. They are usually used in new construction along with square plate washer and taper washers. There is also a requirement to mimic an older fastener aesthetic in both new and old buildings.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. Crossarm or machine bolts are commonly supplied for the utility industry and included an added cone point.

Leader-Fastener® ANSI B 18.2.1 - 1996 Square Bolts