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Sample thread gauge

circa 1917-1919

ring gauge

1907

ring gauge

1969

Thread gauge by Holtzapffel

Horstmann adjustable thread caliper gauge for M8 threads

Sample thread gauge

circa 1917-1919
Steel centre gauge, Whitworth standard 55 degree angles. Pattern no. 878, and steel centre gauge, U.S. standard angle, 60 degrees pattern no. 879, both mounted together on a display board (see 2 stroke nos).

Steel centre gauge

Three O-VEE Spring Thread Gauges.

Three O-VEE Spring Thread Gauges.

1946 or later.
Taper Thread Gauge checking machine, 1934, for the measurement of the thread pitch.

Taper Thread Gauge checking machine

circa 1934
Set of Whitworth/Metric thread gauges, recovered from British Rail Engineering Ltd. Swindon

Metric thread gauge

Five thread gauges

Five thread gauges