Four 7/8" diameter 9 t.p.i. screwing taps, for nut fastener manufacture
- PART OF:
- Whitworth Screw stock taps
- Made:
- 1850-1857 in Manchester urban district
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.
Details
- Category:
- Hand and Machine Tools
- Object Number:
- 1857-8 Pt1
- Materials:
- steel (metal)
- Measurements:
-
overall: .9055 x 13.7795 x 3.937 in.; 23 x 350 x 100 mm
- type:
- screwing tackle
- credit:
- Joseph Whitworth and Co.
