Unbranded CAT 40 Hardware Knobs sku-18289615545 Pull Stud

This Unbranded CAT 40 pull stud retention knob is listed under Hardware Knobs as SKU sku-18289615545, UPC 769212345315. The title specifies 5/8-11, 45 and part reference 202-5928(5), and names Fadal, Mazak, Hurco and Tree. It is made from alloy steel 5155, heat-treated to RC 56-58, with a black oxide finish. Each knob undergoes magnetic-particle testing for cracks.

Concentricity is checked with a Mahr Millimess 1003 dial comparator with 1 micron graduation and 0.5 micron repeatability. The loading and unloading contact-point heights are checked in microns on an optical tool presetter because out-of-tolerance heights can cause improper spindle engagement and damage the knob.

Critical surfaces, including the pilot beneath the flange, are fully ground for contact with the tool holder taper. The flange bottom is finished to fit the taper nose.