Imperial Thread and other tables

(Scanned from a frail 1946 Mechanical Engineer's diary!)

Useful data on older and obsolete inch thread sizes.

    Click on the table thumbnails to enlarge



Heat & temper colours for steel (temperatures in Farenheit, the UK standard at the time).

To jog your memory, F = (C x 1.8) + 32

British Standard Whitworth thread table for " and upwards. The Meccano system uses a 5/32" Whitworth thread which was in common usage in the early 1900's for household fittings! Not shown on the engineers table, it is 32 t.p.i.

B.S.F., B.S.P. & B.A. thread data

Letter & Number Drill, and various inch Wire gauges - British & American. Hornby chose to use Imp. Gauge 8 for the rod-axle gauge in his "Mechanics Made Easy", subsequently "Meccano" outfits.

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(c) Peter Sullivan's Meccano web pages 2003