Taps, Drills and Dies – Inch and Metric by Robert Porter

Useful information for the watch, clock and model maker and hobbyist to help you decide which screw thread, tap drill, or die to use. Topics include: Screw thread standardization; length engagement; type of taps and their markings; the use of pitch gauges; determining screw thread sizes; thread size and corresponding tap drill charts; how to make a special tap; number, letter and fractional drill size charts; making your own tap drills; high quality Swiss metric thread, pitch and tap drill size charts; repair examples; German Lowenherz and British thread series charts; watch stem and crown thread charts; vintage pocket watch and Elgin thread and tap charts. 79 black and white photos and diagrams.60 pages. Size is 5-1/2″ x 8-1/2″. Soft Cover.