Nitro 1541H alloy & chromium and molybdenum alloy axles are commonly known as "chromoly. Their OE replacement axles are made of forged alloy for a 20-30% increase in strength over their stock counterparts. Nitro chromoly axles are also precision machined and heat treated but are designed with extra material for strength where it's needed. All of our axles are precision machined to OE specifications for excellent fitment. Nitro also offers extra long-splined shafts which can be cut to length and blank shafts for custom spline machining.