Skip to content
See Our Products and Solutions

ULTIMATE CHUCKS

Ultimate Chuck™

Ultimate Chuck

High performance quick jaw change chuck for the shop running small batches

  • The Solution for First Operation Chucking
    • A few sets of jaws quickly adjust to cover a wide diameter range
    • Change, adjust or reverse all three jaws in one minute
    • 1/4 turn wrench, no T-nuts or bolts
    • Adjust hard jaws in and out to any diameter
    • Only three sets of "Deep Bite Job Shop" hard jaws cover full grip range OD and ID
      • Stop using inadequate grip soft jaws for roughing operations
      • "Deep Bite Job Shop Jaws" transmit torque for maximum metal removal

Ultimate Chuck Models & Specifications

NOMINAL CHUCK SIZE   7” 8” 10” 12” 16” 20” 25”
    UC3-180-53 UC3-215-66 UC3-260-81 UC3-315-104 UC3-400-128 UC2-500-155 UC2-630-167
Chuck outside diameter A 7.09 8.46 10.24 12.40 15.75 19.69 24.80
Through hole B 2.09 2.59 3.18 4.00 5.04 6.10 6.57
C 4.13 4.68 5.43 5.75 6.14 7.08 7.07
(UC2B) C       5.89 5.89 7.24 7.19
Direct mount spindle sizes   A5, A6 A6, A8 A6, A8 A8, A11 A11, A15 A11, A15 Z-520
Max. thread with adapter D M60 M75 M90 M100 M138 M170 M180
E max 1.63 1.93 2.04 2.54 3.40 3.97 4.74
F 2.56 3.35 4.09 4.52 4.92 6.29 7.87
(UC2B) F       4.72 5.83 6.53 7.99
Piston stroke - max   0.83 0.94 1.10 1.10 1.18 1.38 1.57
Stroke per jaw - max.   0.27 0.30 0.35 0.36 0.39 0.45 0.50
Stroke per jaw with most commoncylinder stoke* *see note 0.23 0.28 0.31 0.30 0.30 0.45 0.43
Jaw adjustment pitch   0.19 0.19 0.22 0.22 0.22 0.28 0.28
Drawbar pull - max. lbs. 7,400 11,900 16,410 22,480 29,900 39,000 39,000
Total grip force lbs. 13,480 22,480 30,350 40,466 53,954 68,000 68,000
Max RPM - UC2   6,300 6,000 4,700 4,000 3,500 2,200 1,700
Max RPM - UC2B         2,800 2,450 1,400 1,000
Weight without jaws lbs. 39 54 110 161 269 518 926

Model UC2 B-Model

    • Optional master base jaws available to fit common serrated and T&G top jaws
    • Note: the High Performance jaw system of the UC2 is not available for the UC2B
    • Better for vertical lathes with O-ring seal to prevent coolant entering between drawtube and spindle bore
    • Full custom packages installed on your lathe by ATS engineers
    • Two year warranty with ATS installation
    • Supported by local ATS Service Technician through the life span of the chuck.
    • Optional High-Low hydraulic systems available
    • The Solution for Second Operation Chucking
      • Eliminate Soft Jaw Reboring
      • Save 45 minutes of changeover downtime
      • Bore jaws only once, store for weeks or months, reinstall with 0.0005" TIR guaranteed without reboring (7" to 12" chucks, 16" chuck 0.0007" TIR)

Monoblock Soft Jaws

  • Double ended - bore each end for a different part
  • Premium alloy steel - lasts much longer
  • No bolts to interfere with gripping surface
  • Quick change
  • Additional Benefits
    • Ultimate Chuck™ wedge bar design allows 25% higher spindle speeds
    • Ultimate Chuck™ maintains 65% of starting grip force at maximum rated RPM.
      • Common chucks maintain only 30% even at their lower rated RPM
Ultimate Chuck™