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In general, unless otherwise noted, measurements are taken from examples in the editor's collection. If you can supply data for missing models, please help me out. Thank you.

Webster and Butterfield

Dimensions of Incher Series of Hand Screws

Dimensions
Screw Diameter	Screw Length	Jaw Length	Jaw Size
		20
1	24 1/2	18	2 1/2 x 2 1/2
1	20	17	2 1/2 x 2 1/2
		16
3/4	17 1/4	14	2 x 2
		12
3/4	12 1/4	10	1 5/8 x 1 5/8
5/8	12 1/4	9	1 3/8 x 1 3/8

last revised and validated