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Pratt Burnerd Constant Grip Quick-Change and Non-Quick Change VTL Power Chucks

MADE IN USA

Closed Center Power Chucks Designed for Vertical Turning Lathes

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.

  • MADE IN USA

  • One Year Warranty

  • ±.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.

  • Close center design with chip ejecting discharge chutes in the chuck body face reducing build-up to near zero.

  • High RPM … up to 5,000 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.

  • 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 prethreaded on request, at a nominal charge.

  • Optional Jaw Setting Fixture (as shown) for presetting top jaws off the machine for the next job, while the machine is still running. A real timesaver!

  • Sizes 6″, 8″, 10″, 12″, 15″, 18″, 20″, and 24″ diameters.

Chuck Size
(D)Direct &(I)Indirect
RPM
Model Number
Jaw Stroke
Sleeve Stroke
Collet Bar Capacity
Tooling Hole Size
Gripping Force lbs/f
Grip Force lbs/f
Wt (lbs)
10.0"
A2-6(I)
5000
9101-426__
.160"
.730"
2.5"
3/8" UNC
7200
19800
82
10.0"
A2-8(D)
5000
9101-526__
.160"
.730"
2.5"
3/8" UNC
7200
19800
82
12.0"
A2-8(I)
4200
9101-531__
.160"
.730"
3.0"
3/8" UNC
9900
27000
150
12.0"
A2-11(D)
4200
9101-631__
.160"
.730"
3.0"
3/8" UNC
9900
27000
150
15.0"
A2-8(I)
3000
9101-538__
.200"
.790"
4.5"
3/8" UNC
13500
31500
280
15.0"
A2-11(D)
3000
9101-638__
.200"
.790"
4.5"
3/8" UNC
13500
31500
280
18.0"
A2-8(I)
2500
9101-546__
.236"
.984"
5.5"
1/2" UNC
15500
38250
375
18.0"
A2-11(I)
2500
9101-646__
.236"
.984"
5.5"
1/2" UNC
15500
38250
375
20.0"
A2-11(I)
2500
9101-650__
.236"
.984"
5.5"
1/2" UNC
15500
38250
550
24.0"
A2-11(I)
1800
9101-660__
.315"
.984"
6.25"
1/2" UNC
20700
38250
760
24.0"
A2-15(I)
1800
9101-760__
.315"
.984"
6.25"
1/2" UNC
20700
38250
760
Quick Change VTL Chucks
Non Quick Change VTL Chucks
Chuck Size
(D)Direct (I)Indirect
RPM
Model Number
Jaw Stroke
Sleeve Stroke
Collet Bar Capacity
Tooling Hole Size
Operating Force lbs/f
Grip Force lbs/f
Wt (lbs)
10.0"
A2-6(I)
5000
9111-426__
.160"
.730"
2.5"
3/8" UNC
7200
19800
82
10.0"
A2-8(D)
5000
9111-526__
.160"
.730"
2.5"
3/8" UNC
7200
19800
82
12.0"
A2-8(I)
4200
9111-531__
.160"
.730"
3.0"
3/8" UNC
9900
27000
150
12.0"
A2-11(D)
4200
9111-631__
.160"
.730"
3.0"
3/8" UNC
9900
27000
150
15.0"
A2-8(I)
3000
9111-538__
.200"
.790"
4.5"
3/8" UNC
13500
31500
280
15.0"
A2-11(D)
3000
9111-638__
.200"
.790"
4.5"
3/8" UNC
13500
31500
280
18.0"
A2-8(I)
2500
9111-546__
.236"
.984"
5.5"
1/2" UNC
15500
38250
375
18.0"
A2-11(I)
2500
9111-646__
.236"
.984"
5.5"
1/2" UNC
15500
38250
375
20.0"
A2-11(I)
2500
9111-650__
.236"
.984"
5.5Z
1/2" UNC
15500
38250
550
24.0"
A2-11(I)
1800
9111-660__
.315"
.984"
6.25"
1/2" UNC
20700
38250
760
24.0"
A2-15(I)
1800
9111-760__
.315"
.984"
6.25"
1/2" UNC
20700
38250
760

** Insert last two digits for Master Jaw type...Example 9101-42623...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.

Technical Specificatons
Chuck Size
A
B
C
D
F
E Max
E Min
G
10-A6
10
5.511
5.669
5.25
1.181
3.268
2.087
M12x35(6)
10-A8
10
5.905
6.063
6.75
1.181
3.268
2.087
M16x150(3)
12-A8
12
6.614
6.771
6.75
1.181
4.291
2.362
M16x40(6)
12-A11
12
6.614
6.771
9.25
1.181
4.291
2.362
M20x110(3)
15-A8
15
6.929
7.086
6.75
1.693
5
3.228
M16x35(6)
15-A11
15
6.929
7.086
9.25
1.693
5
3.228
M20x180(6)
18-A8
18
7.72
7.78
6.75
1.693
6.772
4.527
M16x40(6)
18-A11
18
7.72
7.78
9.25
1.693
6.772
4.527
M20x35(6)
20-A11
19.7
7.362
7.499
9.25
2.362
8.09
5.059
M20x45(6)
24-A11
24
7.56
7.72
9.25
2.362
10.09
5.77
M20x45(6)
24-A15
24
7.56
7.72
13
2.362
10.09
5.77
7/8-9x8(6)
Additional Technical Specificatons
Chuck Size
H
J
K
Min
Max
S
W
10-A6
M12x35
1?2 UNFx3?4
4.53
1.42
2.15
0.63
1.57
10-A8
M12x35
1?2 UNFx3?4
4.53
1.3
2.03
0.63
1.57
12-A8
M14x45
1?2 UNFx3?4
5.71
1.3
2.03
0.71
1.81
12-A11
M14x45
1?2 UNFx3?4
5.71
1.38
2.16
0.71
1.81
15-A8
M20x55
1?2 UNFx3?4
473/789
1.38
2.16
0.866
2.36
15-A11
M20x55
1?2 UNFx3?4
473/789
1.38
2.36
0.866
2.36
18-A8
M20x55
1?2 UNFx3?4
433/630
1.38
2.36
0.984
2.36
18-A11
M20x55
1?2 UNFx3?4
433/630
1.38
2.36
0.984
2.36
20-A11
M20x35
1?2 UNFx3?4
705/994
1.38
3.36
0.984
2.36
24-A11
M20x35
1?2 UNFx3?4
***
1.57
2.56
0.984
2.36
24-A15
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° 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.

Quick Change Chuck Jaw Choices
Master Jaw Type
10 Inch
12 Inch-1
15 Inch-2
18 Inch-3
20 Inch-4
24 Inch-5
Type - 1.5mm "
8130-26623
8130-31623
8130-40623
8130-46623
8130-50623
8130-61623
60 Deg. Fine Serration
1/16 " 90 Deg. Fine serration
8130-26610
8130-31610
8130-38610*
8130-46610*
8130-50610*
8130-61610*
Acme Serration
8130-26626
8130-31626
8130-40626
8130-46626
8130-50626
8130-61626
American Std.
8130-26607
8130-31607
8130-40607
8130-46607
8130-50607
8130-61607
Tongue & Groove
Square Serration
8130-26627
8130-31627
8130-40627
8130-46627
8130-50627
8130-61627
Mono Block Jaw
8130-26601
8130-31601
8130-38601
8130-46601
8130-50601
8130-61601

** 20 and 24 diameter chucks supplied with 3mm x 60° serrations * 15, 18, 20 and 24 diameter chucks supplied with 3/32 x 90° serrations
*** Also available in long pointed design

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