UCP320 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 UCP320 model number is decoded

NTN ships the UCP320 as a matched assembly — UC320D1 insert swaged into the P320 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 3 code identifies the duty series and the final two digits encode the 100 mm bore. Key mounting figures: centre height H = 140 mm, overall base length L = 490 mm, bolt-hole spacing J = 380 mm, and each of the two feet takes a 36 mm (M30) fastener for the 100 mm shaft. The 3-series section is the heavy-duty end of the range: a UC3 high-capacity insert in the longest, strongest housing, specified for shock loads and long conveyor centres. 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. Above 90 mm bore these are primary process drives — mining conveyors, bulk materials handling, heavy fans — where the 3-series insert and massive casting protect against shock and contamination. Sawmill and woodworking machinery mounts this unit on saw arbors and feed rolls, where vibration is continuous and the setscrews must be re-checked after the first hours of running. After the first 24–48 running hours, re-torque both setscrews and the foundation bolts — seating of the inner ring on the shaft and crush of any paint under the feet otherwise leaves the bearing loose at the worst possible time. Basic ratings of the UC320D1 insert are 192 kN dynamic and 141 kN static; the assembled UCP320 weighs about 33.0 kg.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 100 mm bore, rigging and alignment dominate the UCP320 installation: the cast unit is lifted into place on the shaft, aligned on the spherical seat, and only then foot-bolted.
• The 3-series insert makes UCP320 the highest-rated unit at 100 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
• As a pillow block, UCP320 needs a prepared horizontal surface at the 140 mm centre height: shim both feet with full-width packs so the 490 mm base seats over its full area.
• Do not confuse UCP320 with a bare UC320D1 bearing: replacing only the insert is possible, but the housing P320 must be unworn and the spherical seat cleaned and coated with anti-seize.
• When ordering covers for UCP320, note the steel and cast-iron cover executions change the unit mass and envelope but not the 380 mm mounting centres.