Set of 12 Cutting Broaches-Sizes Range-0.4mm to 4.5mm

Set of 12 Cutting Broaches-Sizes Range-0.4mm to 4.5mm

These cutting, cleaning & finishing broaches are made of high quality steel and are uniformly tempered for a long life. Lengths vary from 150 mm (5-7/8") for the largest size (Stubs #15) to 66 mm (2-5/8") for the smallest size (Stubs #70).

The smallest broach begins at 0.4 mm at the tip and tapers up to 0.7 mm before the handle. The largest broach begins at 3.3 mm and tapers up to 4.5 mm at the handle.

These broaches are not available individually

Approximate Diameter Ranges of the 12 five-sided cutting broaches:
0.4 mm to 0.7 mm Stubs 70 (15.370) .027"
0.5 mm to 0.9 mm Stubs 64
0.7 mm to 1.0 mmStubs 60 (15.360) .039"
0.8 mm to 1.3 mmStubs 55 (15.355) .050"
1.0 mm to 1.5 mm Stubs 53
1.2 mm to 1.8 mm Stubs 49
1.4 mm to 2.0 mm Stubs 46
1.6 mm to 2.2 mm Stubs 44
2.0 mm to 2.7 mm Stubs 36
2.2 mm to 3.0 mm Stubs 31
2.6 mm to 3.5 mm Stubs 28
3.3 mm to 4.5 mm Stubs 15 (15.315) .180"

These broaches are called English Pattern Broaches. They use what is called the Stubs sizing grading system, an obscure measuring system originating in England. The numbers correspond to the markings from an English screw plate by Peter Stubs of Warrington in Lancashire, a well know maker of watch and clock making tools in business during the early 1800's.