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A boxed set of master-taps by Holtzapffel

circa 1800

Whitworth Screw stock taps

1850-1857

Three screw die sets: 1/2", 5/8" and 1", with three pieces per set, for bolt manufacture

1850-1857

Four screwing tap sets: 1/2", 5/8", 3/4", and 1"; for nut fastener manufacture

1850-1857
Adjustable die wrench by Whitworth fitted with a set of 3/4" dies

Adjustable die wrench

1850-1857
Set of four 7/8" diameter 9 t.p.i. screwing taps, by Joseph Whitworth and Company, Manchester, Lancashire, England, 1850-1857. This is a set of four taps. First, the smallest diameter and most tapered tap is screwed into the pre-drilled hole. Then taps 2 and then 3 are screwed into the hole. Finally, the tapping process is finished with the largest tap with the most flutes. This is the finishing tap and should give a finer finish to the threads.

Four 7/8" diameter 9 t.p.i. screwing taps, for nut fastener manufacture

1850-1857
7/8"screw die in three parts

7/8"screw die in three parts, for bolt manufacture

1850-1857
Three tap wrenches each for a set size of tap tang, one for taps 7/16" across square,1/2" and 5/8" across square.

Three tap wrenches: 7/16", 1/2" and 5/8" across square

1850-1857
Die stock and set of seven dies 3/8" to 5/8", made and used by Henry Maudslay, c. 1800

Die stock and set of seven dies 3/8" to 5/8"

circa 1810