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