Retention knobs offer single point threading for durability

TJ Davies retention knobs include threads which are formed using single point threading to Imperial (Class 2A UNC) or Metric (Class G6) standards.

This ensures that the threads are balanced (lead-in/lead-out at 180 degrees) and that full depth is attained for each thread. Attaining full depth provides them with a firmer grip which holds the tooling securely without vibration.

TJ Davies manufactures every retention knob using American-made 8620 alloy steel that is then machined in-house in a single set-up to ensure concentricity. The use of 8620 ensures that the components will work harden over time. After threading is completed, each component is heat treated to 58-62 HRC then treated with hot black oxide to military specifications for protection against corrosion. Each retention knob is magnetic particle tested and then pull tested to 2.5 times the pulling force of the drawbar it is designed for. Certifications maintained for each step and each batch ensure traceability and quality control.

T.J. Davies | www.tjdavies.com