FATIGUE-PROOF^® is made by various combinations of mechanical working and thermal treatment which can include Niagara-Lasalle's "e.t.d.^®" (elevated temperature drawing) process. This is a high strength steel bar that eliminates heat treating and secondary operations such as cleaning, straightening, secondary machining and inspection operations. All this, in combination with the machining and high strength, operate to lower end costs. FATIGUE-PROOF^® induction hardens satisfactorily, but should be watched for quench cracks. FATIGUE-PROOF^® is also electro-magnetically tested using eddy currents.

FATIGUE-PROOF^® is a trademark of the LaSalle Steel Corporation. www.niag.com