Clearance Bolton Tools R8 JT2 Drill Chuck Arbor in Prime Quality

1. R8 Shank, 2 Jacobs Taper

2. TIR: ≤0.0002″

3. Material: 20CrMnTi

4. Constructed of alloy steel hardened to 56 – 60 HRC

5. For use with drill chucks with a JT2 mount

6. Total indicated runout is from 0.00039″ 

7. Rear thread for pull stud is 7/16″ – 20UNF

8. Nickel coating surface, Anti-rust, anti-corrosion, durability better.

Product Description

1. R8 Shank, 2 Jacobs Taper

2. TIR: ≤0.0002″

3. Material: 20CrMnTi

4. Constructed of alloy steel hardened to 56 – 60 HRC

5. For use with drill chucks with a JT2 mount

6. Total indicated runout is from 0.00039″ 

7. Rear thread for pull stud is 7/16″ – 20UNF

ChongDe is a manufacture in R&D, production, sales and services with ISO9001 certificate. The main products are precision tool holder, clamping collet, pull stud, nut, spanner and other machine tool accessories with the standards of ISO, DIN, ANSI/ASME, JIS and local GB, etc.

Cryogenic treatment◆ -384.8℉ long cryogenic, nearly all of the residual austenite into martensite.◆ Carbide precipitation of nanoscale particles, increasing the hardness and toughness.◆ Reducing residual stresses.◆ Wear resistance significantly improved.Thermal aging processing◆ long stereotyped thermal limitation removal of grinding residual stress.

Anti-rust, Anti-corrosion, Durability better◆ Coating adhesion strong, enhance hardness, and anti-rust better in different surroundings, such as acid, alkali, ammonia, salt etc.◆ Overall nickel coating, including inside and outside cone, even if you do not take any anti-rust actions, it will not rust either, don’t influence processing precision and spindle.◆ Improve cleanness, precision more stable, surface more smooth, feel more comfortable and appearance nicer.