Longfield™ 30-Spline Birfield
The Longfield™ birfields are made out of 100% chromoly and are precision polished to remove any imperfections that may cause stress risers. The Longfield™ birfield housing is made out of forged 4340 chromoly steel. The internals of our Longfield™ birfields are made out of vacuum arc remelted 4340 chromoly steel and then dual heat-treated for superior strength.
The Longfield 30-spline Birfields allow up to 40 degrees of turning radius and have a consistant breaking point of 8900-9000 foot pounds of torque (all testing data is based on internal testing at TGI).