Yamaha:WR 250F 07-13, WR 450F 07-15, YZ 250F 06, YZ 450F 06-08
Pins are precision turned, induction hardened and polished in accordance with tolerances set by vehicles' manufacturer. The material employed is SAE52100 high grade bearing steel, it is hardened to above HRC60 and then the raceway is precision grounded.
Collars are precision turned, polished, hardened to HRC48 and then Zinc plated. The material used is automotive's standard SPCC steel.
Dust seals are made of Nitrile Butadiene Rubber and strictly molded to exact OEM specifications. They prevent abrasives, corrosive moisture and other harmful contaminants from entering bearings.
HEAVY DUTY NEEDLE BEARINGS
Heavy duty needle bearings are full complement drawn cup,induction hardened SPCC steel with internal clearances particularly suitable to off road racing use (high shocks and loads).