What this part is:Timken 33895-903A1 is a Class 3 single-row tapered roller bearing (TS) made up of the 33895 cone and the 33821 cup. Bore Diameter: 2.1250 in (53.975 mm). Outside Diameter: 3.7500 in (95.250 mm). Total Width: 1.0938 in (27.783 mm). Rolling Elements: Tapered Roller.
Decoding the designation:33895 — Timken cone (inner ring, rollers and cage), 2.1250 in bore, 33800 series.
33821 — Timken single cup (outer ring), 3.7500 in OD.
-3 / *3 — Timken Class 3 precision: tighter tolerance and lower running runout than standard Class 2.
903A1 — Timken assembly number for this Class 3 cone and cup pairing.
What these specs mean in practice:Dynamic Load Rating: 130,000 N (C1, 1 million revolutions, ISO). Dynamic Load Rating C90: 33,600 N (90 million revolutions, Timken method). Dynamic Axial Rating Ca90: 19,000 N. Static Load Rating: 161,000 N. e Factor: 0.33. Y Factor: 1.82. K Factor: 1.77. Precision Class: Class 3. Item Weight: 0.8 kg (1.8 lb).
Mounting data:Cone Width: 1.1250 in (28.575 mm). Cup Width: 0.8750 in (22.225 mm). Effective Load Center: -0.3 in (-7.6 mm), inside the cone backface. Max Shaft Fillet Radius: 0.060 in (1.5 mm). Max Housing Fillet Radius: 0.090 in (2.29 mm). Shaft Backing Shoulder Diameter: 2.36 in (60 mm) frontface, 2.48 in (63 mm) backface. Housing Backing Shoulder Diameter: 3.56 in (90.42 mm) frontface, 3.35 in (85.09 mm) backface.
Quantity and configuration:Cone and cup assembly: one 33895-3 cone with one 33821-3 cup, single row, adjusted at mounting.
Cross-reference guidance:33895/33821 is an ABMA inch-series set also built as NTN 4T-33895/33821, Koyo 33895/33821, SKF 33895/33821/Q and NSK 33895/33821. Those references share the same cone and cup numbers; the Class 3 grade is specific to this Timken assembly.
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