Secure Toolholders with Pull Stud Retention Knobs from TTC. A critical but often overlooked component of the milling process is the retention knob. It can be the first source of chatter during the machining process. Pull stud retention knobs facilitate automatic tool change on modern CNC machines. With TTC's pull stud retention knobs for V-flange caterpillar tooling, you can reduce harmonics, increase taper contact, increase rigidity while machining. TTC offers these retention knobs by world standards: ANSI style for CAT spindles with 40 or 50 tapers. These knobs have a pilot and no relief. The angle of the knob head is 45-degree on all models offered. Thru-hole models for coolant flow are also on offer along with solid models for coolant flow along flange-fed. All TTC pull stud retention knobs are manufactured from hot rolled steel. They are hard-turned during the manufacturing process for superior fit and finish. These knobs are balanced by design. You can find a range of measuring instruments, carbide, and high-speed steel radius and cutting tools, abrasives, holding accessories, and much more from the TTC brand here We have retention knobs manufactured in Japanese standards, DIN standards, CINCINNATI MILARON standards, HURCO standards with tapers of 40, 50. This USA Made brand is now a top choice for general-purpose projects. TTC PRODUCTION USA MADE 171-22 5/8"-11 Thread Pull Stud Retention Knobs For V-Flange Caterpillar Tooling Cincinnati Milacron Pull Stud