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Whitworth Threading Inserts

Our range of Whitworth threading inserts can machine full form BSW, BSF & BSP 55 degree threads. Korloy single point threading inserts for lathe screw cutting are compatible with all major threading tool holders (with the exception of Sandvik).  Whitworth threads can also be machined with 55 degree partial profile threading inserts which do not top the thread off.

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Korloy threading inserts are stocked as standard in grade PC3030T, suitable for general machining on steel, stainless and cast iron.  We can also offer Vardex threading inserts from Vargus for more demanding applications (e.g. performance threading of stainless steel, titanium or aluminium).   
Size guide

  • 11ER/NR = Vardex 2ER/IR
  • 16ER/NR = Vardex 3ER/IR
  • 22ER/NR = Vardex 4ER/IR
  • 27ER/NR = Vardex 5ER/IR

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