Home $ Product $ Power Chucks $ Pratt Burnerd Quick-Change 2-Jaw Power Chucks

Pratt Burnerd Quick-Change 2-Jaw Power Chucks


Constant Grip High Speed Thru-Hole Power Chucks

Jaw Presetting Fixture Order number 1009-07090 for use with 6″, 8″, 10″, 12″, 15″, 18″ and 20″ sizes Standard Bore and King Bore Models Quick Change Jaw Power Chucks.

  • One Year Warranty
  • ±.0005″ Repeatability
  • 4-Point Adjusting Feature in the chuck body allows you to true up to virtually zero. Increase Soft Jaw Life by using the adjustment feature instead of skim cutting soft jaws as often. 6 points on 15″ chucks and larger
  • High RPM … up to 6,000 using standard top jaws … without loss of gripping force, due to internally counter-balanced design.
  • Quick Change Master Jaws, 2 sets supplied with each chuck permits offline pre-assembly of top tooling for next job reducing traditional setup time by 95%.
  • SAFE Visual Indicator shows when Master Jaws are in the unlocked mode.
  • Master jaws available in 1.5mm x 60° (Japanese type), 1/16″ x 90°, Acme serration and square serration, American Standard tongue and groove.
  • Utilize existing top tooling by selecting style of master jaws from 1.5 x 60,1/16″ x 90, Am. Std. Acme, Am. Std Tongue & Groove and Square Serrations or substitute mono block jaws. Sets can be mixed styles.
  • Large Thru-Hole Capacity
  • Utilize the machine’s existing actuating cylinder – including Japanese types.
  • Easy Installation – removable blank sleeve in the chuck allows the customer to bore and thread the sleeve of the chuck to match existing drawtube of drawbar. PBA can supply chuck sleeve pre-threaded on request, at a nominal charge.
  • Optional Jaw Setting Fixture for presetting top jaws off the machine for the next job, while the machine is still running. A real timesaver!
  • Sizes 6″, 8″, 10″, and 12″, diameters…other sizes available on request.
Chuck SizeMount
RPMModel No.*Jaw StrokeSleeve StrokeThru HoleCollet Pad Bar CapacityTooling Hole SizeOperating Force
Grip Force
Wt (lbs)
6.5"A2-4(I)60009141-217__.140".630"1.65"1.5"5/16" UNC2400660031
6.5"A2-5(D)60009141-317__.140".630"1.65"1.5"5/16" UNC2400660031
6.5"A2-6(I)60009141-417__.140".630"1.65"1.5"5/16" UNC2400660031
8.25"A2-5(I)55009141-321__.140".630"2.05"2.0"5/16" UNC41001000053
8.25"A2-6(D)55009141-421__.140".630"2.05"2.0"5/16" UNC41001000053
8.25"A2-8(I)55009141-521__.140".630"2.05"2.0"5/16" UNC41001000053
10.0"A2-6(I)50009141-426__.160".730"2.56"2.5"3/8" UNC48001320082
10.0"A2-8(D)50009141-526__.160".730"2.56"2.5"3/8" UNC48001320082
12.0"A2-8(I)42009141-531__.160".730"3.54"3.0"3/8" UNC660018000150
12.0"A2-11(D)42009141-631__.160".730"3.54"3.0"3/8" UNC660018000150
* Insert last two digits for Master Jaw type...Example 9141-21723...Indicates 1.5mm x 60°: Master Jaw Required
Use 23 for 1.5mm x 60° Japanese type.
Use 26 for Acme Serration.
Use 10 for 1/16 X 90° Serrations.
Use 07 for Am. Std Tongue & Groove.
Use 27 for Square Serration.
Use 01 for Mono jaws. (Machine-able master jaws)
Dimensional and Performance Data (in inch)
Chuck SizeABCDFMaxMin
Dimensional and Performance Data (in inch)
Chuck SizeGHJKMinMaxSW
6-A4M10x25(6)M10x255⁄16 UNFx1⁄22.990.941.570.4751.22
6-A5M10x130(4)M10x255⁄16 UNFx1⁄22.991.11.730.4751.22
6-A6M12x30(6)M10x255⁄16 UNFx1⁄22.991.52.130.4751.22
8-A5M10x30(6)M12x353⁄8 UNFx3⁄43.940.981.610.5511.57
8-A6M12x130(4)M12x353⁄8 UNFx3⁄43.941.191.810.5511.57
8-A8M16x30(6)M12x353⁄8 UNFx3⁄43.942.022.650.5511.57
10-A6M12x35(6)M12x351⁄2 UNFx3⁄44.531.021.750.631.57
10-A8M16x150(4)M12x351⁄2 UNFx3⁄44.531.442.150.631.57
12-A8M16x40(6)M14x451⁄2 UNFx3⁄45.711.32.030.711.81
12-A11M16x160(4)M14x451⁄2 UNFx3⁄45.711.32.030.711.81
(T) Draw Tube Thread Blank
1. Dimensions listed are with 1.5 x 60° Japanese type master jaws. Some dimensions will vary using other Master Jaw types such as Acme, 1/16" x 90° or Am. Std. Tongue & Groove.
2. Chuck is at mid stroke with master jaws flush with the body O.D.
3. UNC mounting bolts available upon request.
Mono block jaws are extremely accurate solid one piece design ideal for dedicated jobs, and will allow you to work closer to the chuck face, due to no jaw bolt obstructions. For longer service Mono Block Jaws are made from a nitride hardening material to allow hardening after forming without major distortion.
See our product catalog for dimensions.
Extra Sets of Master Jaws for Quick Change Jaw Power Chucks
Master Jaw Type -
1.5mm x 60°Fine Serration
(Japanese Type)
1/16 x 90° Fine serration
(European Type)
Acme SerrationN/A8130-216268130-266268130-316268130-406268130-466268130-506268130-61626
American Std.
Tongue & Groove
Square SerrationN/A8130-216278130-266278130-316278130-386278130-466278130-506278130-61627
Mono Block Jaw:
***Also available in long pointed
**3.0mm x 60 degree serrations
*3/32" x 90 degree serrations
Contact us for our King-Bore Master Jaw Set part #'s as they are different than our Standard Bore Jaws.