UpSubject: 5-1/4"od x 5" lg nitralloy steel bar - free ship offer
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Similar to 4140, but alloyed to improve nitride hardness. Surplus Nitralloy 135M Steel, Heat Treated to about 30 HRc. Please note that the hardness specification is maintained from the outer diameter to half radius on large diameters bars, such as this one. |