Square Head Machine Bolts

Blacksmith Bolt offers Square Head Machine Bolts in sizes from #10-24 x 1/2" to 1"-8 x 10". We try to carry most of these in both plain steel and black oxide.

Most of these bolts will have light head marks of "307A" or similar.

#10-24 Square Head Machine Bolts

1/4"-24 Square Head Machine Bolts

5/16"-18 Square Head Machine Bolts

3/8"-16 Square Head Machine Bolts

7/16"-14 Square Head Machine Bolts

1/2"-13 Square Head Machine Bolts

5/8"-11 Square Head Machine Bolts

3/4"-10 Square Head Machine Bolts

7/8"-9 and larger Square Head Machine Bolts

For bolt dimensions see here