UCP203 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (CAT. No. 2203-3/E 2024) · extracted 2026-09-25

Parameters extracted from the official NTN Ball and Roller Bearings catalogue (CAT. No. 2203-3/E 2024); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the UCP203 model number is decoded

NTN ships the UCP203 as a matched assembly — UC203D1 insert swaged into the P203 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 2 code identifies the duty series and the final two digits encode the 17 mm bore. Key mounting figures: centre height H = 30.2 mm, overall base length L = 127 mm, bolt-hole spacing J = 95 mm, and each of the two feet takes a 13 mm (M10) fastener for the 17 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. In this smallest bore class the units appear on light belt conveyors, food-packaging tables and small fans; the emphasis is on quick bolting-down rather than rating calculations. Food and packaging lines choose this unit when the layout allows an external mount: it lives outside the washdown zone, sealed and greased for life intervals that outlast a production campaign. Use grade 8.8 foundation bolts with flat washers under both head and nut, and pull them in stages in a cross pattern; the cast feet are strong in compression but a single over-torqued bolt can crack an ear. Basic ratings of the UC203D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCP203 weighs about 0.7 kg.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Small units like UCP203 are often over-tightened simply because they feel light in the hand — use the correct setscrew torque for the 17 mm bore or the points strip out of the shaft.
• The standard 2-series insert in UCP203 is the lightest section at 17 mm — do not substitute it into a position that previously ran an X or 3 unit: the 95 mm mounting may match while the load rating does not.
• As a pillow block, UCP203 needs a prepared horizontal surface at the 30.2 mm centre height: shim both feet with full-width packs so the 127 mm base seats over its full area.
• The D1 suffix on UC203D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCP203 on site accepts relubrication.
• Self-aligning is not the same as free to move: the UC203D1 insert of UCP203 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.