21-02-2019, 03:54 AM
(This post was last modified: 21-02-2019, 03:59 AM by Bob Culver.)
Whitworth form, as Whitworth, BSF, BSP. The cross sectional shape of the thread; angle, finish at top and bottom, tolerance ranges etc. 55 deg included angle of the peaks instead of 60deg of SAE, AN, Unified, SI, ISO. In several sizes Whit threads and UNC same pitch but the form differs. Interchange for rough work. Books like Machinery's Handbook cover.
Whitform may be applied to any pitch as a special, which some Seven threads are. I guess it safeguarded against substiute of low strength common parts with consequent troubles.
Whitform may be applied to any pitch as a special, which some Seven threads are. I guess it safeguarded against substiute of low strength common parts with consequent troubles.