Blackline Semi Floating hub kit

Blackline Atlas Into English Semi Floating Hub to run with 18 spline Blackline Axles 

All blackline halfshafts Group 1 and Group 4 are manufactured from 4340 allot steel and have induction hardened teeth to Rockwell 50 HRC specifications. 4340 is about twice as strong as 1040 ( the material which OEM halfshafts are normally manufactured from). It has a high degree of ductility to absorb shock loadings of abrupt acceleration, taking some loads off the differential and CWP.  However, it has a very high yield strangth to sustain high torque loads without failure. 4340 is the ideal halfshaft material.