四方沉头螺栓tableA-1
Regular Head Plow Bolts(Square Head,Countersunk)
四方沉头螺栓table3
Repair Head Plow Bolts(Squre Head,Countersunk)
4号方沉头螺栓(修正头) [Table 3] (A307, F468, F593, SAE J 429)
No.4 Repair plow countersunk square bolt [Table 3] (A307, F468, F593, SAE J 429)