Steel thread gauge for American 60 degree threads.
Steel thread gauge for American 60 degree threads.
Five thread gauges
Steel thread gauge for American 60 degree threads.
Steel thread gauge for Whitworth 55 degree threads.
Setting gauge for thread cutting tools, 29 degree threads, unknown date
29 degree screw thread gauge for measuring screw pitch; size 1 to 10 t.p.i.
Standard screw thread gauge for 2 1/4 to 20 t.p.i.