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Pratt Burnerd SETRITE 3 & 6-Jaw Scroll Chucks

PBA 253 Series – 3-Jaw • 263 Series – 6-Jaw
Direct Replacement for the Buck Ajust-Tru® Early Design

• Two-year warranty
• Precision manufactured for adapter mounting
• .0005 TIR repeatability on duplicate parts 
• Steel body on sizes 6″ thru 15″
• Semi-steel body on the 5″ chucks
• 4 adjusting screws – 5″, 6″, 8″, 10″, 12″
• 8 adjusting screws – 15″
• Sizes 5″ to 15″
• Nitride hardened scroll
• Hardened pinion
• Two-piece American standard tongue and groove jaws on chuck sizes 6″ thru 15″
• 5″ chucks equipped with one set of solid I.D jaws and one set of solid O.D. jaws
• One pinion – 5″, 6″, 8″, 10″, 12″; 3 pinions – 15″,
• Durability — double the contact surface of the master jaw and body versus our competitors’ chucks

 

PBA Setrite Manual 2021

Self-Centering Universal Steel Body SETRITE® Chuck
Chuck Size (in)Model NumberApprox. Weight (lbs)Maximum RPM*
253 Series - 3 Jaw
5"0515400145000
6"0625300264900
8"0825300464200
10"1025300713300
12"12253001202300
15"15253002182000
263 Series - 6 Jaw
5"0516400153600
6"0626300273500
8"0826300493000
10"1026300762400
12"12263001302000
15"15263002261500
*Eccentric adjustment of chuck on mounting plate to obtain required TIR on the workpiece may result in unacceptable vibration at these speeds. Reduce RPMs accordingly. Jaws must be fully engaged in the chuck body.
Dimensional Data for Series 253 & 263 Adapter Mounting Self-Centering Chucks
Chuck SizeGripping Capacity
AB*CDEFG1G2HKMin.**Max.
5"5.00"2.375"¨1.30"2.84".66"4.44"-5.00"1/4"1/16"4"
6"6.31"3.125"1.81"2.88"1.59"0.69"5.34"-7.31"1/4"3/16"5"
8"8.25"4.750"2.25"3.25"1.75"0.75"7.50"-9.25"3/8"3/16"6-1⁄2"
10"9.85"6.375"3.00"3.63"2.13"0.81"-4.38"11.00"7/16"3/16"8"
12"12.20"7.906"4.06"4.00"2.28"0.84"-5.25"14.00"1/2"3/4"10"
15"15.74"11.7812"4.56"5.13"3.16"1.13"-6.75"17.00"5/8"1-1⁄2"13"
*Tolerance - .000/+.001 **6-Jaw Chuck minimum grip, consult factory _x0002_Recess can be opened up to 2.745" - 2.755"
Soft top jaws shown in our pdf catalog. ® Ajust-Tru is a registered trade mark of Illinois Tool Works.
Mounting Plates For “SETRITE”® 3 Jaw and 6 Jaw - 253 & 263 Series Chucks
PBA offers a full line of Mounting Plates type "D", "A", "L" and threaded plates for the "SETRITE"® Chucks. PBA Mounting Plates are interchangeable with other popular adjustable universal style Chucks.

Mounting plates are precision machined to suit the spindle nose of your machine. For maximum accuracy of "SETRITE"® mounting plates, mount plate on machine spindle nose, place a dial indicator on the chuck side face of the adapter close to the mounting holes, rotate the adapter and if the total indicator reading (TIR) exceeds .0005" take a light truing cut across the face of the mounting plate.
Type D Mounting Plates "Camlock"
Spindle6"8"10"12"15"
D-3605020805020-----
D-46050218050211005021----
D-56050228050221005022----
D-6-805023100502312050231505023--
D-8--100502412050241505024
D-11---12050251505025
Type A American Standard Short Taper A-1 & A-2, Spindles
Spindle6"8"10"12"15"
A-4605009------
A-56050108050101005010----
A-6-80501110050111205011---
A-8--100501212050121505012-
A-11----1505013
A-15------
Type L American Standard Long Taper Key Drive Spindle
Spindle6"8"10"12"15"
L-006050318050311005031----
L-060503280503210050321205032---
L-1-805033100503312050331505033
L-2--100503412050341505034
L-3----1505035
For Hardinge® and Elgin Lathe
Spindle5"6"
4° Taper505044605044
2-3⁄16"-10 Threaded505045605045
Also available, plates for rotary tables
Threaded & Blank Mountings for SETRITE™ Chucks
Spindle5"6"8"10"12"
Blank50504060504080504010050401205040
1-1⁄2"-8505041605041805041--
1-3⁄4"-8505042605042805042--
2-1⁄4"-8505043605043805043--
2-3⁄8"-6-605046805046--
*Threaded adapter plates and special plates are available upon request.
"SETRITE" chucks and adapters are shipped unassembled unless ordered assembled at extra charge.
When ordering special adapters give make, model number, size, and spindle dimensions of machine.
For standard spindle dimensions, see our pdf catalog.