QCS Workholding LLC
10635 Tower Oaks Blvd.  Ste. E
Houston  TX   77070
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AtlasChucks.com

An Online Pratt Burnerd/Atlas Chuck Distributor

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Pratt Burnerd/Atlas
3-Jaw Constant Grip Power Chucks
 

Constant Grip High Speed Standard and King Bore Thru-Hole Power Chucks Sizes 6" Thru 24"

  • One Year Warranty
  • High RPM - up to 6000
  • Constant Grip, internally counter-balanced design that reduces grip loss from centrifugal force of the jaws at high RPM.
  • Easy Retrofit on most all existing NC and CNC lathes utilizing the same drawtube and actuating cylinder including Japanese types.
  • Accurate - repeatability of .0005"
  • 3-Point Adjusting Feature in the chuck body permits indicating in to zero. Increase Soft Jaw Life by using adjustment feature. Reduce or eliminate re-boring of Soft Jaws.
  • Doubles as collet chuck as master jaws have keyed radius in front that accept standard W & S collet pads. Eliminate time wasted on switching over to collet chuck.
  • Large Thru-Hole Capacity
  • 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 Serrationsor substitute mono block jaws. Sets can be mixed styles.
  • Also available in 2-jaw style.
  • Chuck sizes available 6", 8", 10", 12", 15",18", 20" and 24" diameters
Chuck
Size
Mount
(D)Direct (I)Indirect
RPM Model No.* Jaw
Stroke
Sleeve
Stroke
Thru
Hole
Collet Pad
Bar Capacity
Tooling
Hole Size
Operating
Force lbs/f
Grip
Force lbs/f
Wt 
(lbs)
6.5" A2-4(I) 6000 9151-217__ .140" .630" 1.65" 1.5" 5/16" UNC 3,600 9,900 31
6.5" A2-5(D) 6000 9151-317__ .140" .630" 1.65" 1.5" 5/16" UNC 3,600 9,900 31
6.5" A2-6(I) 6000 9151-417__ .140" .630" 1.65" 1.5" 5/16" UNC 3,600 9,900 31
8.25" A2-5(I) 5500 9151-321__ .140" .630" 2.05" 2.0" 5/16" UNC 6,200 15,000 53
8.25" A2-6(D) 5500 9151-421__ .140Z .630" 2.05" 2.0" 5/16" UNC 6,200 15,000 53
8.25" A2-8(I) 5500 9151-521__ .140" .630" 2.05" 2.0" 5/16" UNC 6,200 15,000 53
10.0" A2-6(I) 5000 9151-426__ .160" .730" 2.56" 2.5" 3/8" UNC 7,200 19,800 82
10.0" A2-8(D) 5000 9151-526__ .160" .730" 2.56" 2.5" 3/8" UNC 7,200 19,800 82
12.0" A2-8(I) 4200 9151-531__ .160" .730" 3.54" 3.0" 3/8" UNC 9,900 27,000 150
12.0" A2-11(D) 4200 9151-631__ .160" .730" 3.54" 3.0" 3/8" UNC 9,900 27,000 150
15.0" A2-8(I) 3000 9151-538__ .200" .790" 4.92" 4.5" 3/8" UNC 13,500 31,500 280
15.0" A2-11(D) 3000 9151-638__ .200" .790" 4.92" 4.5" 3/8" UNC 13,500 31,500 280
18.0" A2-8(I) 2500 9151-546__ .236" .984" 5.59" 5.5" 1/2" UNC 15,500 38,250 375
18.0" A2-11(I) 2500 9151-646__ .236" .984" 5.59" 5.5" 1/2" UNC 15,500 38,250 375
20.0" A2-11(I) 2500 9151-650__ .236" .984" 5.59" 5.5" 1/2" UNC 15,500 38,250 550
24.0" A2-11(I) 1800 9151-660__ .315" .984" 6.299" 6.25" 1/2" UNC 20,700 38,250 760
24.0" A2-15(D) 1800 9151-760__ .315" .984" 6.299" 6.25" 1/2" UNC 20,700 38,250 76
King Bore Chucks
7.0" A2-5(D) 7000 9161-318__ .140" .630" 2.20" 2.0" 5/16" UNC 4,500 13,000 37
8.25" A2-6(D) 5500 9161-421__ .140" .630" 2.59" 2.5" 5/16" UNC 5,400 15,000 53
10.43" A2-6(I) 5000 9161-426__ .160" .730" 3.03" 3.0" 3/8" UNC 7,200 19,800 82
10.43" A2-8(D) 5000 9161-526__ .160" .730" 3.03" 3.0" 3/8" UNC 7,200 19,800 82
12.40" A2-8(I) 4200 9161-531__ .160" .730" 4.05" 4.0" 3/8" UNC 9,900 27,000 183
12.40" A2-8(D) 4200 9161-531__ .160" .730" 4.05" 4.0" 3/8" UNC 9,900 27,000 183
 Insert last two digits for Master Jaw type...Example 9151-21723...Indicates 1.5mm x 60: Master Jaw Required
Use 23 for 1.5mm x 60 Japanese type.** Use 07 for Am. Std Tongue & Groove. Use 10 for 1/16 X 90 Serrations.***
Use 26 for Acme Serration. Use 27 for Square Serration.

Dimensional Data

Dimensional and Performance Data (in inch)
  E
Chuck Size A B C D F Max Min
6-A4 6.5 4.685 4.803 3.25 0.787 2.126 1.339
6-A5 6.5 4.842 4.96 4.125 0.787 2.126 1.339
6-A6 6.5 5.078 5.196 5.25 0.787 2.126 1.339
8-A5 8.25 5.119 5.275 4.125 1 2.637 1.733
8-A6 8.25 5.354 5.51 5.25 1 2.637 1.733
8-A8 8.25 5.705 5.862 6.75 1 2.637 1.733
10-A6 10 5.511 5.669 5.25 1.181 3.268 2.087
10-A8 10 5.905 6.063 6.75 1.181 3.268 2.087
12-A8 12 6.614 6.771 6.75 1.181 4.291 2.362
12-A11 12 6.614 6.771 9.25 1.181 4.291 2.362
15-A8 15 6.929 7.086 6.75 1.693 5 3.228
15-A11 15 6.929 7.086 9.25 1.693 5 3.228
18-A8 18 7.72 7.78 6.75 1.693 6.772 4.527
18-A11 18 7.72 7.78 9.25 1.693 6.772 4.527
20-A11 19.7 7.362 7.499 9.25 2.362 8.09 5.059
24-A11 24 7.56 7.72 9.25 2.362 10.09 5.77
24-A15 24 7.56 7.72 13 2.362 10.09 5.77
Dimensional and Performance Data (in inch)
    L  
Chuck Size G H J K Min Max S W
6-A4 M10x25(6) M10x25 5⁄16 UNFx1⁄2 2.99 0.94 1.57 0.475 1.22
6-A5 M10x130(3) M10x25 5⁄16 UNFx1⁄2 2.99 1.1 1.73 0.475 1.22
6-A6 M12x30(6) M10x25 5⁄16 UNFx1⁄2 2.99 1.5 2.13 0.475 1.22
8-A5 M10x30(6) M12x35 3⁄8 UNFx3⁄4 3.94 0.98 1.61 0.551 1.57
8-A6 M12x130(3) M12x35 3⁄8 UNFx3⁄4 3.94 1.19 1.81 0.551 1.57
8-A8 M16x30(6) M12x35 3⁄8 UNFx3⁄4 3.94 2.02 2.65 0.551 1.57
10-A6 M12x35(6) M12x35 1⁄2 UNFx3⁄4 4.53 1.02 1.75 0.63 1.57
10-A8 M16x150(3) M12x35 1⁄2 UNFx3⁄4 4.53 1.41 2.15 0.63 1.57
12-A8 M16x40(6) M14x45 1⁄2 UNFx3⁄4 5.71 1.3 2.03 0.71 1.81
12-A11 M20x160(3) M14x45 1⁄2 UNFx3⁄4 5.71 1.3 2.03 0.71 1.81
15-A8 M16x35(6) M20x55 1⁄2 UNFx3⁄4 473/789 1.38 2.16 0.866 2.36
15-A11 M20x180(6) M20x55 1⁄2 UNFx3⁄4 473/789 1.38 2.36 0.866 2.36
18-A8 M16x40(6) M20x55 1⁄2 UNFx3⁄4 433/630 1.38 2.36 0.984 2.36
18-A11 M20x35(6) M20x55 1⁄2 UNFx3⁄4 433/630 1.38 2.36 0.984 2.36
20-A11 M20x45(6) M20x35 1⁄2 UNFx3⁄4 705/994 1.38 236 0.984 2.36
24-A11 M20x45(6) M20x35 1⁄2 UNFx3⁄4 *** 1.57 2.56 0.984 2.36
24-A15 7/8-9x8(6) M20x35 1⁄2 UNFx3⁄4 *** 1.57 2.56 0.984 2.36
(T) Draw Tube Thread Blank
1. Dimensions listed are with 1.5 x 60 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.
4. Standard master jaw serration for 20 and 24 inch chucks are 3mm x 60.
***9.45"/13"/16.53"/20.08"


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