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Pratt Burnerd Quick-Change Jaw Grip Fast Power Chucks, Standard and King Bore

MADE IN USA

PBA Constant Grip High Speed Thru-Hole Power Chucks, Sizes 6″ Thru 24″

Shown with optional jaw setting fixture and hard reversible top jaws.
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

  • MADE IN USA

  • ±.0005″ Repeatability

  • 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.

  • 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.

  • 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.

  • 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

Chuck Size
(I)Indirect(D)Direct
RPM
Model Number
Jaw Stroke
SleeveStroke
Thru Hole
Bar Capacity
Tooling Hole Size
Operating Force lbs/f
Grip Force lbs/f
Wt (lbs)
6.5"
A2-4(I)
6000
9131-217**
.140"
.630"
1.65"
1.5"
5/16" UNC
3600
9900
31
6.5"
A2-5(D)
6000
9131-317**
.140"
.630"
1.65"
1.5"
5/16" UNC
3600
9900
31
6.5"
A2-6(I)
6000
9131-417**
.140"
.630"
1.65"
1.5"
5/16" UNC
3600
9900
31
8.25"
A2-5(I)
5500
9131-321**
.140"
.630"
2.05"
2.0"
5/16" UNC
5400
15000
53
8.25"
A2-6(D)
5500
9131-421**
.140"
.630"
2.05"
2.0"
5/16" UNC
5400
15000
53
8.25"
A2-8(I)
5500
9131-521**
.140"
.630"
2.05"
2.0"
5/16" UNC
5400
15000
53
10.0"
A2-6(I)
5000
9131-426**
.160"
.730"
2.56"
2.5"
3/8" UNC
7200
19800
82
10.0"
A2-8(D)
5000
9131-526**
.160"
.730"
2.56"
2.5"
3/8" UNC
7200
19800
82
12.0"
A2-8(I)
4200
9131-531**
.160"
.730"
3.54"
3.0"
3/8" UNC
9900
27000
150
12.0"
A2-11(D)
4200
9131-631**
.160"
.730"
3.54"
3.0"
3/8" UNC
9900
27000
150
15.0"
A2-8(I)
3000
9131-538**
.200"
.790"
4.92"
4.5"
3/8" UNC
13500
31500
280
15.0"
A2-11(D)
3000
9131-638**
.200"
.790"
4.92"
4.5"
3/8" UNC
13500
31500
280
18.0"
A2-8(I)
2500
9131-546**
.236"
.984"
5.59"
5.5"
1/2" UNC
15500
38250
375
18.0"
A2-11(I)
2500
9131-646**
.236"
.984"
5.59"
5.5"
1/2" UNC
15500
38250
375
20.0"
A2-11(I)
2500
9131-650**
.236"
.984"
5.59"
5.5"
1/2" UNC
15500
38250
550
24.0"
A2-11(I)
2000
9131-661**
.315"
.984"
6.299"
6.0"
1/2" UNC
20700
38250
760
24.0"
A2-15(D)
2000
9131-761**
.315"
.984"
6.299"
6.0"
1/2" UNC
20700
38250
760
PRATATLAS 3-JAW QUICK CHANGE TECHSPEC.png
Standard Bore Chuck Size
A
B
C
D
F
E Max
E Min
6-A4
6.496
4.685
4.803
3.25
0.787
2.126
1.339
6-A5
6.496
4.842
4.96
4.125
0.787
2.126
1.339
6-A6
6.496
5.078
5.196
5.25
0.787
2.126
1.339
8-A5
8.26
5.119
5.275
4.125
1
2.637
1.733
8-A6
8.26
5.354
5.51
5.25
1
2.637
1.733
8-A8
8.26
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
19.68
7.362
7.499
9.25
2.362
8.09
5.059
24-A11
24.02
7.56
7.72
9.25
2.362
10.09
5.77
24-A15
24.02
7.56
7.72
13
2.362
10.09
5.77
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