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Chuck Backplate Adapters

The first rule of buying a threaded adapter is to measure the threads on your spindle. There are simply too may variants of every kind of lathe to trust any chart.

If your lathe is listed below, it's easy to find the correct backplate adapter. If your lathe is not listed, measure the spindle threads and find the same thread in the table below.

We make no guarantees on the accuracy of this information.
MEASURE YOUR SPINDLE.

Lathe Chuck Diameter
Brand Model Swing Thread 3" 4" 4" (3-jaw) 6"
Atlas   6" 1/2"-20 2022      
Atlas 10100 6" 1"-10 Use 1791 1791 1917  
Atlas TH42 10" 1 1/2"-8 Use 1792 1792 1918 1919
Atlas 5991 12" 1 1/2"-8 Use 1792 1792 1918 1919
Atlas 3986 12" 1 1/2"-8 Use 1792 1792 1918 1919
Emco Maier Maximat V10 5" M39x4mm Use 1921 1921 Use 1921 1922
Grizzly G8688 7" 3" Flange None 1692 or 1774 1692 or 1774  
Grizzly G4000 9" M39x4mm Use 1921 1921 Use 1921 1922
Harbor Freight 33684 7" 3" Flange None 1692 or 1774 1692 or 1774  
Harbor Freight 45861 (BV20) 9" M39x4mm Use 1921 1921 Use 1921 1922
Homier 03911 7" 3" Flange None 1692 or 1774 1692 or 1774  
Jet 920N 9" 1 1/2"-8 Use 1792 1792 1918 1919
King CH-920 AG 9" M39x4mm Use 1921 1921 Use 1921 1922
King 9x20 9" 1 1/2"-8 Use 1792 1792 1918 1919
Logan   9" 1 1/2"-8 Use 1792 1792 1918 1919
Logan   10" 1 1/2"-8 Use 1792 1792 1918 1919
Logan   11" 2 1/4"-8 Use 1923 Use 1923 Use 1923 1923
Logan   12" 2 1/4"-8 Use 1923 Use 1923 Use 1923 1923
Logan 6510/6560 14" 2 1/4"-8 Use 1923 Use 1923 Use 1923 1923
Micro-Mark 82710 7" 3" Flange None 1692 or 1774 1692 or 1774  
Micro-Mark 82500 7" 3" Flange None 1692 or 1774 1692 or 1774  
Sears 101.07301 6" 1"-8 Use 1790 1790 1916  
Sears 101.2899 12" 1 1/2"-8 Use 1792 1792 1918 1919
Sheldon WM-46-P 13" 2 1/4"-8 Use 1923 Use 1923 Use 1923 1923
Sherline All 3.5" 3/4"-16 1920      
Sidney Machine Lot 160 14" 2 1/4"-8 Use 1923 Use 1923 Use 1923 1923
South Bend CL187ZB 10" 2 1/4"-8 Use 1923 Use 1923 Use 1923 1923
South Bend CL8187AB 10" 2 1/4"-8 Use 1923 Use 1923 Use 1923 1923
Taig Microlathe II 4.5" 3/4"-16 1920      

If you have updated information on spindle threads, please let us know.

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