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Lathe Chuck Adapter Dimensions

This page provides the dimensions of the threaded lathe chuck backplate adapters that we sell. In most cases the registration boss needs to be turned down to the diameter shown. This ensures concentricity on your lathe, but pretty much precludes the use of these adapters on wood lathes.

Lathe chuck adapter dimensions


PN Nominal
Size
Outside
Diameter
Thread Bolt
Holes
Bolt
Size
Bolt
Circle
Hub
Diameter
Hub
Length
Flange
Thickness
Registration
Boss
Registration
Diameter
2022 3" 80 mm 0.5"-20 3 M6 66 mm 50 mm 19 mm 16 mm 3 mm 57 mm
1920 3" 80 mm 0.75"-16 6 M6 66 mm None None 12 mm 3 mm 55 mm
1916 4" 100 mm 1"-8 3 M8 84 mm 56 mm 10 mm 16 mm 3 mm 72 mm
1790 4" 100 mm 1"-8 None     56 mm 10 mm 16 mm 3 mm 72 mm
1917 4" 100 mm 1"-10 3 M8 84 mm 56 mm 10 mm 16 mm 3 mm 72 mm
1791 4" 100 mm 1"-10 None     56 mm 10 mm 16 mm 3 mm 72 mm
1918 4" 100 mm 1.5"-8 3 M8 84 mm 56 mm 14 mm 16 mm 3 mm 72 mm
1792 4" 100 mm 1.5"-8 None     56 mm 14 mm 16 mm 3 mm 72 mm
1921 4" 100 mm M39x4 None     56 mm 24 mm 16 mm 3 mm 72 mm
2335 4" 100 mm 10 mm
smooth bore
None     56 mm 24 mm 16 mm 3 mm 72 mm
2331 5" 125 mm 1"-8 None     56 mm 10 mm 16 mm 4 mm 100 mm
2333 5" 125 mm 1"-10 None     56 mm 10 mm 16 mm 4 mm 100 mm
2332 6" 160 mm 1"-8 None     56 mm 10 mm 16 mm 4 mm 130 mm
2334 6" 160 mm 1"-10 None     56 mm 10 mm 16 mm 4 mm 130 mm
1919 6" 160 mm 1.5"-8 None     56 mm 14 mm 16 mm 4 mm 130 mm
5126 6" 160 mm 1.75"-8 None     56 mm 24 mm 16 mm 4 mm 130 mm
1923 6" 160 mm 2.25"-8 None     75 mm 16 mm 16 mm 4 mm 130 mm
1922 6" 160 mm M39x4 None     56 mm 24 mm 16 mm 4 mm 130 mm
2336 6" 160 mm 10 mm
smooth bore
None     56 mm 24 mm 16 mm 4 mm 130 mm