1-1/4-7 Carbon Steel British Standard Whitworth Rethreading Die
1-1/4-7 British Standard Whitworth Hex Rethreading Die
Product Detailed Description
1-1/4-7 Hex Die, British Standard Whitworth
British Standard Whitworth thread, after it's introduction in 1841, was rapidly adopted throughout England and the continent. British Standard fine thread is a second series which was established in 1908 to meet the needs of additional engineering activity. The thread angle for BSW and BSF is 55° whereas the thread angle for all standard NC, NF, NPT, etc. is 60°. During 1975, the British formally completed their ten year conversion to the metric system, thus making the British thread forms and inch measurements obsolete for new design and production.
This Drill America DWTBSW1-1/4-7HEX Hex Rethreading Dies, British Standard Whitworth, Carbon Steel typically ships within 24 to 48 hours
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