All of our references featuring casehardened steel are recognizable by the prefix 4T For these bearings casehardening is applied to all the bearing components • Inner ring • Outer ring • Rollers TYPES OF STEEL 100% of our inch references use casehardened steel A hardened surface layer for enhanced resistance
? The “4T” prefix designates a tapered roller bearing that is made of a special grade of casehardened bearing steel and is interchangeable with other manufacturers taper with the same part number
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As for the maximum value for inner and outer ring diameters of bearings whose bearing numbers are marked with "†" (inner ring) and "††" (outer ring) the precision class is an integer for class 4 and class 2 bearings only 4THH221449A/HH221410 122 116 171 179 35 33 144 033 179 099 706 4T941/932 130
For details consult NTN Engineering (4) Concerning ET and 4T Types ET and 4T tapered roller bearings are made of highpurity case hardened steel and are manufactured with a special heat treatment developed by NTN As a result wear life and reliability have been improved to where life coefficient a2 values can be
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