µmatic                        
Increase Productivity At An Economy Price With The Unique Precision Chuck From Centaur

The µmatic high precision chuck is designed specifically to meet the demands of today’s new generation of machines and
cutting tools. µmatic’s powerful clamping force and ability to hold tools within 50 millionths T.I.R. eliminate the need for
expensive hydraulic chucks and conventional milling chucks.

Centaur’s innovative µmatic chuck features clamping surfaces ground directly from the toolholder body. Holding a cutting tool within 0.0002” T.I.R. is achieved with no adjustments.

µmatic incorporates truing screws that contact the tool shank directly, permitting rapid adjustments to within 50 millionths — either on a presetter or in the machine spindle.

µmatic is ideal for rough milling and finish milling. And because of µmatic’s unusually high accuracy, it is perfectly suited for holemaking applications that normally require hydraulic chuck or boring operations.

The µmatic high precision chuck ensures greater workpiece accuracy, while delivering increased feed rates and tool life.

The bottom line: Increased productivity.

Features and Benefits

• Patented, vibration-damping structure. Centaur’s µmatic interrupts the transmission of helical vibrations to allow increased RPM and feed rates.
• Guaranteed high accuracies. Tools clamp within 0.0002” T.I.R. with no adjustment. Truing screws that contact directly to the tool shank can be set easily and quickly to achieve T.I.R. within 50 millionths.
• Ideal for today’s finest machine tools. µmatic is balanced to 22,000 RPM and is sealed for coolant-through applications.
• Locking screw. In addition to exerting extremely powerful clamping forces, the µmatic high precision chuck is equipped with a Weldon type screw to eliminate tool pullout common with standard heavy duty milling chucks.
• Delivery from stock. µmatic chucks are shipped directly from Centaur’s huge U.S.-based inventory in all standard sizes. CAT/V-Flange, BT and HSK shanks are available. 40 taper toolholders have a capacity to 1-1/2” endmills; 50 taper to 2”.
• Value pricing. µmatic high precision chucks can replace expensive hydraulic chucks and heavy duty milling chucks, yet are available from Centaur at a fraction of the cost.

CAT/V-FLANGE SPECIFICATIONS

Part No. Shank d D D1 L L1 (mm.) (in.) (mm.) (in.) (mm.) (in.) (mm.) (in.) C40UM0250 C40UM0312 C40UM0375 C40UM0437 C40UM0500 C40UM0625 C40UM0750 C40UM0875 C40UM1000 C40UM1125 C40UM1250 CAT 40 CAT 40 CAT 40 CAT 40 CAT 40 CAT 40 CAT 40 CAT 40 CAT 40 CAT 40 CAT 40 0.250” 0.312” 0.375” 0.437” 0.500” 0.625” 0.750” 0.875” 1.000” 1.125” 1.250” 28.5 28.5 35.5 38 38 42.5 48.5 50.5 61.5 64 70 1.122 1.122 1.398 1.496 1.496 1.673 1.909 1.988 2.421 2.520 2.756 37.5 37.5 44.5 44.5 44.5 49.5 54.5 56.5 68.5 68.5 73.5 1.476 1.476 1.752 1.752 1.752 1.949 2.146 2.224 2.697 2.697 2.894 86 86 96 96 96 98 100 100 106 106 114 3.386 3.386 3.780 3.780 3.780 3.858 3.937 3.937 4.173 4.173 4.488 25 25 31.5 31.5 31.5 32.5 34.5 34.5 39 39 43.5 0.984 0.984 1.240 1.240 1.240 1.280 1.358 1.358 1.535 1.535 1.713 C50UM0250 C50UM0312 C50UM0375 C50UM0500 C50UM0625 C50UM0750 C50UM0875 C50UM1000 C50UM1125 C50UM1250 CAT 50 CAT 50 CAT 50 CAT 50 CAT 50 CAT 50 CAT 50 CAT 50 CAT 50 CAT 50 0.250” 0.312” 0.375” 0.500” 0.625” 0.750” 0.875” 1.000” 1.125” 1.250” 28.5 28.5 35.5 38 42.5 48.5 50.5 61.5 64 70 1.122 1.122 1.398 1.496 1.673 1.909 1.988 2.421 2.520 2.756 37.5 37.5 44.5 44.5 49.5 54.5 56.5 68.5 68.5 73.5 1.476 1.476 1.752 1.752 1.949 2.146 2.224 2.697 2.697 2.894 86 86 96 96 98 100 100 106 106 114 3.386 3.386 3.780 3.780 3.858 3.937 3.937 4.173 4.173 4.488 25 25 31.5 31.5 32.5 34.5 34.5 39 39 43.5 0.984 0.984 1.240 1.240 1.280 1.358 1.358 1.535 1.535 1.713

BT SPECIFICATIONS

Part No. Shank d D D1 L L1 (mm.) (in.) (mm.) (in.) (mm.) (in.) (mm.) (in.) B40UM0250 B40UM0312 B40UM0375 B40UM0437 B40UM0500 B40UM0625 B40UM0750 B40UM0875 B40UM1000 B40UM1125 B40UM1250 BT 40 BT 40 BT 40 BT 40 BT 40 BT 40 BT 40 BT 40 BT 40 BT 40 BT 40 0.250” 0.312” 0.375” 0.437” 0.500” 0.625” 0.750” 0.875” 1.000” 1.125” 1.250” 28.5 28.5 35.5 38 38 42.5 48.5 50.5 61.5 64 70 1.122 1.122 1.398 1.496 1.496 1.673 1.909 1.988 2.421 2.520 2.757 37.5 37.5 44.5 44.5 44.5 49.5 54.5 56.5 68.5 68.5 73.5 1.476 1.476 1.752 1.752 1.752 1.949 2.146 2.224 2.697 2.697 2.894 78 78 88 88 88 90 92 92 98 98 106 3.071 3.071 3.465 3.465 3.465 3.543 3.622 3.622 3.858 3.858 4.173 25 25 31.5 31.5 31.5 32.5 34.5 34.5 39 39 43.5 0.984 0.984 1.240 1.240 1.240 1.280 1.358 1.358 1.535 1.535 1.713 B50UM0250 B50UM0312 B50UM0375 B50UM0500 B50UM0625 B50UM0750 B50UM0875 B50UM1000 B50UM1125 B50UM1250 BT 50 BT 50 BT 50 BT 50 BT 50 BT 50 BT 50 BT 50 BT 50 BT 50 0.250” 0.312” 0.375” 0.500” 0.625” 0.750” 0.875” 1.000” 1.125” 1.250” 28.5 28.5 35.5 38 42.5 48.5 50.5 61.5 64 70 1.122 1.122 1.398 1.496 1.673 1.909 1.988 2.421 2.520 2.756 37.5 37.5 44.5 44.5 49.5 54.5 56.5 68.5 68.5 73.5 1.476 1.476 1.752 1.752 1.949 2.146 2.224 2.697 2.697 2.894 89 89 99 99 99 101 101 109 109 127 3.504 3.504 3.898 3.898 3.898 3.976 3.976 4.291 4.291 5.000 25 25 31.5 31.5 32.5 34.5 34.5 39 39 43.5 0.984 0.984 1.240 1.240 1.280 1.358 1.358 1.535 1.535 1.713

HSK SPECIFICATIONS

Part No. Shank d D D1 L L1 (mm.) (in.) (mm.) (in.) (mm.) (in.) (mm.) (in.) H63AUM0250 H63AUM0312 H63AUM0375 H63AUM0500 H63AUM0625 H63AUM0750 H63AUM0875 H63AUM1000 H63AUM1125 H63AUM1250 HSK 63 HSK 63 HSK 63 HSK 63 HSK 63 HSK 63 HSK 63 HSK 63 HSK 63 HSK 63 0.250” 0.312” 0.375” 0.500” 0.625” 0.750” 0.875” 1.000” 1.125” 1.250” 28.5 28.5 35.5 38 42.5 48.5 50.5 61.5 64 70 1.122 1.122 1.398 1.496 1.673 1.909 1.988 2.421 2.520 2.756 37.5 37.5 44.5 44.5 49.5 54.5 56.5 68.5 68.5 73.5 1.476 1.476 1.752 1.752 1.949 2.146 2.224 2.697 2.697 2.894 87 87 97 97 99 101 101 114 114 124 3.425 3.425 3.819 3.819 3.898 3.976 3.976 4.488 4.488 4.882 25 25 31.5 31.5 32.5 34.5 34.5 39 39 43.5 0.984 0.984 1.240 1.240 1.280 1.358 1.358 1.535 1.535 1.713