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Retention knobs available separately for purchase
flushing chips and extending tool life
Produced from mill certified
collet chuck extensions
Test Bars relatedproduct Retention knobs available separately forFitz Rite test bars are made in the USA and are held to the highest standards for checking the accuracy of your CNC machining centers' spindle. They are manufactured from mill certified hardened alloy steel. The shank is held concentric to the taper within one tenth (TIR . 0001"). The taper is manufactured to ASME B5. 50 standards and precision ground to meet AT 3 tolerance. Test bars require a retention knob fitted to your machine specifications.