ring gauge
1907
ring gauge
1969
Thread gauge by Holtzapffel
Sample thread gauge
circa 1917-1919
International Thread measuring machine
Taper Thread Gauge checking machine
Taper Thread Gauge checking machine
Taper Thread gauge checking machine
Taper Thread Gauge checking machine
Steel thread gauge for American 60 degree threads.
N. K.
Setting gauge for thread cutting tools
1857-1948
Sample thread gauge
circa 1917-1919
Steel centre gauge
O-VEE Spring Thread Gauges
1946 or later.
O-VEE Spring Thread Gauge
1946 or later.
Taper thread Gauge checking machine
Taper Thread Gauge Checking machine
Taper Thread Gauge checking machine
29 degree screw thread gauge
1857-1948
Steel thread gauge
N. K.
Steel centre gauge
Three O-VEE Spring Thread Gauges.
1946 or later.
Taper Thread Gauge checking machine
circa 1934
Five thread gauges
Fold away 'System International' thread gauges
Standard handles nos. 0-6
O-VEE Spring Thread Gauge, 9B.A.
1946 or later.
Standard screw thread gauge for 2 1/4 to 20 t.p.i.
N. K.
Thread gauges
Adapter for screw thread measurement, for Sigma Instruments thickness gauge
1951