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Normal
Yes, probably, due to the 20 TPI 'Cycle' thread series apparently becoming obsolete after it changed from CEI to BSC.It is a thread of "Whitworth form" (BS 84) but in alternative pitches to the standard Whitworth coarse thread pitch.BSF is also a "Whitworth Form thread" and also BS 84.= Special Whitworth or Whit Form/Whitform.[URL unfurl="true"]https://www.tracytools.com/taps-and-dies/whitform-taps-dies[/URL][URL unfurl="true"]https://andover-norton.co.uk/en/shop-details/17229[/URL]
Yes, probably, due to the 20 TPI 'Cycle' thread series apparently becoming obsolete after it changed from CEI to BSC.
It is a thread of "Whitworth form" (BS 84) but in alternative pitches to the standard Whitworth coarse thread pitch.
BSF is also a "Whitworth Form thread" and also BS 84.
= Special Whitworth or Whit Form/Whitform.
[URL unfurl="true"]https://www.tracytools.com/taps-and-dies/whitform-taps-dies[/URL]
[URL unfurl="true"]https://andover-norton.co.uk/en/shop-details/17229[/URL]
