The Longfield Gun Drilled 30-Spline Birfields are made out of 100% chromoly and are precision polished to remove any imperfections that may cause stress risers. The internals of the birfield are also made from 4340 chromoly and are dual heat treated for superior strength.
The Gun Drilled 30-Spline Birfields also have a shallow relief near the splines on the stub shaft known as a Machined Spline Saver.
Specification:
- Made out of 100% chromoly and are precision polished to remove any imperfections that may cause stress risers
- Birfield housing is made out of forged 4340 chromoly steel
- Internals of our Longfield™ birfields are made out of 4340 chromoly steel and then dual heat-treated for superior strength
Note: The spline count on the stub shaft is 31-spline and 30-spline on the inner star.
