The engineer Joseph Whitworth developed the BSW thread in 1841 and it is still used to this day. It has a coarser pitch than BSF threads. We have a range of wire thread inserts specifically for repairing damaged or stripped BSW threads.
BSW 1/4-20x1.5D Wire Thread Inserts (Bag of 10)In Stock£3.43BSW 3/8-16x1.5D Wire Thread Inserts (Bag of 10)In Stock£6.46BSW 1/2-12x1.5D Wire Thread Insert (Bag of 10)Lead time: 4/5 weeks£8.61BSW 5/8-11x1.5D Wire Thread Inserts (Bag of 5)Lead time: 3/4 weeks£7.74BSW 3/4-10x1.5D Wire Thread Inserts (Bag of 5)In Stock£6.61
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