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Chucks are heavy! Get assistance when 

installing or removing the chuck from the 

lathe. Wear heavy duty leather boots for 

foot and toe protection, and keep hands and 

fingers away from all pinch points. Ignoring 

this warning can lead to a severe crushing 

injury or finger amputation!

Model SB1309

High Precision 8" Lathe Chuck

Instruction Sheet

Specifications

  OD Clamping Range ...0.32"-7.08" (8-180mm)

  ID Clamping Range ..2.44"-6.70" (62-170mm)

  Outer Diameter .............................8" (203mm)

  Maximum Chuck Key Torque  .........72 ft/lbs*  

  Maximum Jaw Gripping Force ....... 5620 lbs*

  Maximum Speed .............................2000 RPM

  Two-Piece Hardened Steel Jaws ...............Yes

  Plain Back Mounting .................................Yes

  Jaw Mounting Cap Screw Torque ...53.5 ft/lbs

  Grease Fitting Lubricated .........................Yes

  Cast-Iron Construction ..............................Yes

  Chuck Weight ......................................... 31 lbs

  Origin ................................................... Taiwan

    * Maximum handle torque and gripping force  

is given at full jaw and scroll gear engage-

ment. If jaw and scroll gear are partially 

engaged, clamping force and gripping force is 

reduced.

Installation

1.  UNPLUG THE MACHINE FROM POWER!

2.  Mount the back plate on the spindle.

3.  Accurately measure the inside of the back 

relief bore on the chuck. This dimension is 

critical and should be ± 0.001''.

4.  Face the back plate to true it. Make passes 

across the face until its entire surface has 

been cut.

5.  Turn a shoulder into the face 

1

8

'' deep and 

0.001" to 0.002'' larger than the back relief 

bore diameter. Remember that this is a press 

fit. Chamfer the corner a small amount to 

prevent any burrs when installing.

Figure 1. Features.

Manufactured 

with high-tech 

German CNC 

machinery.

Grease fitting for 

complete internal 

lubrication.

Universal 

plain-back 

mounting.

Hardened steel jaws 

for durability and 

extreme clamping 

force and grip.

Two-piece 

jaws for speedy 

internal/external 

clamping changes.

Designed for 

up to 

2000 RPM.

If you need help with your new item, contact 

us at: (360) 734-1540  FAX: (360) 676-1075

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