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"
|
|