FOR IMMEDIATE RELEASE
Retention Knobs Available for Same Day Shipping
Mantua, OH – TJ Davies stocks the industry’s broadest line of retention knobs for same-day shipping. Manufactured from American-made 8620 alloy steel that is then machined in-house with
single point threading to Imperial (Class 2A UNC) or Metric (Class G6), ensures that these components work harden over time, providing a long service life. After threading is completed, each component is heat treated to 58-62 HRC to a depth of .020 to .030, 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. With over 500 styles available, T.J. Davies Co., Inc., manufactures the industry’s broadest line of retention knobs; the most popular styles are inventoried for immediate availability for orders received by 3 pm EST.
In addition to the 500 plus styles available, TJ Davies has an in-house Engineer who can make custom knobs for older machines that are no longer made.
The use of US made 8620 alloy steel ensures that the components will work harden over time, rather than becoming brittle as is the case with the use 9310 alloy steel. Single point threading ensures that the threads are balanced (lead-in/lead-out at 180 degrees) which is very difficult to achieve when rolling threads. Full depth is also attained for each thread. Because all machining is done with a single set-up, concentricity is achieved.
Each component is heat treated to a case depth of .020 to .030. No carb is applied to coolant through hole to ensure there is no shrinkage. Core hardness of 40HRC is standard. All retention knob surfaces (not just mating surfaces) have a precision finish of 32 RMA micro or better, ISO grade 6N. Certifications are maintained for each step and each batch to ensure traceability and quality control.
Overtightening can overly stress the retention knob, leading to premature failure, and can cause toolholder swelling and expansion. TJ Davies provides recommended torque guidelines with each retention knob shipped. Machine builder recommendations should always be used when available.
For additional information on T.J. Davies retention knobs, pull studs, and sockets, visit www.tjdavies.com.
Founded in 1965, T.J. Davies Company, Inc. is a leading manufacturer of retention knobs located in Mantua, Ohio. The vision of T.J. Davies Company, Inc. is to produce world-
class, made-in-America retention knobs and to provide exceptional customer service. Veteran Founded, Certified Women Owned Business. Their products are available through a nationwide network of distributors.
CONTACT INFORMATION:
T.J. Davies Company, Inc.
Marketing
440-248-5510
marketing@tjdavies.com