Hi Guys,
I have this screw plate stamped Buck & Hickman 1892. The threads are numbered 1 smallest to 9. The left hand threads are decimal marked from .094 to .25. The threads on the right are the same size but have numbers marked which are not sequential, top to bottom :57, 49, 42, 37, 37, 50, 26, 33, 20, may be tpi ? Can anyone provide further information regarding the identity of these threads.
Cheers David