UCP319 bearing: complete specifications & equivalents
The UCP319 is a JIS B 1559 radial bearing sized 95 x 200 x 103 mm (bore x OD x width) with 2RS sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 95 mm |
| Outer diameter D | 200 mm |
| Width B | 103 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 169 kN |
| Basic static load rating C0 | 119 kN |
| Fatigue load limit Pu | 7.65 kN |
| Mass | 26000 g |
| Housing height H | 125 mm |
| Housing overall length L | 470 mm |
| Mounting bolt center distance J | 360 mm |
| Mounting hole diameter N | 36 mm |
| Manufacturer designation | UCP319 |
| Standard | JIS B 1559 |
| Catalog version | CAT. No. 2203-3/E 2024 |
| Last verified | 2026-09-25 |
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.
Dimensions in inches & UCP-series range
| Bore d | 3.74 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 4.055 in |
| ISO bore code | 19 |
| Radial section height (D−d)/2 | 52.5 mm |
| Smallest bore in UCP-series | 12 mm |
| Largest outer diameter in UCP-series | 300 mm |
| Width range across UCP-series | 31–145 mm |
| Bore position in UCP-series (smallest first) | 19 of 25 |
| Bore above smallest UCP-series size | 83 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCP319 | ISO 15 | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data. |
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 UCP319 model number is decoded
A 95 mm bore upright mounted bearing, NTN UCP319 combines the UC319D1 self-aligning insert with the grey-iron P319 pillow block base. On the nameplate, UCP319 decodes as a UC wide-inner-ring insert in a P plummer block, 3-series duty, 95 mm bore; the UC319D1 designation shows the D1 greasable execution. Boundary data for the 95 mm bore: housing centre height 125 mm, base 470 mm, mounting centres 360 mm for M30 fasteners through 36 mm holes; the UC319D1 insert itself is 200 mm OD. 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. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Belt-conveyor builders fit this unit at the drive and tail pulleys: the spherical seat absorbs the small angular errors of a welded truss, and the setscrew lock keeps the inner ring stationary on a shaft that reverses every time the belt is run back. Torque the two setscrews in sequence: run the first to half value, the second to full value, then come back to the first; NTN’s recommended setscrew torque rises sharply with shaft size, so use the table for this bore rather than a wrench feel inherited from smaller units. Basic ratings of the UC319D1 insert are 169 kN dynamic and 119 kN static; the assembled UCP319 weighs about 26.0 kg.
Typical equipment & failure modes
Common applications
- ship-loader and stacker drives
- mining and port conveyor pulleys
- primary crusher feeders
- wet, abrasive or chemically aggressive environments relying on the lip seals and slingers
Known failure patterns
- water-emulsified grease after washdown with the fitting facing upward
- setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in
- insert brinelling from hammer mounting or from belt tension applied to a stationary unit
Selection pitfalls — read before you substitute
- The lip seals and slingers on UCP319 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.
- Never weld a bracket to the P319 housing of UCP319: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- Foundation design for UCP319 must resist the belt-pull reaction at 125 mm centre height — a moment arm this large walks an inadequately anchored base under load.
- The 3-series insert makes UCP319 the highest-rated unit at 95 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
- As a pillow block, UCP319 needs a prepared horizontal surface at the 125 mm centre height: shim both feet with full-width packs so the 470 mm base seats over its full area.
Frequently asked questions
How is UCP319 locked to the shaft, and how tight should the setscrews be?
The UC319D1 insert uses two collar setscrews on the 95 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated.
When should I choose a pillow block like UCP319 instead of a flanged unit?
Choose the UCP319 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 125 mm above the 470 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
Can I replace just the insert inside an UCP319 unit?
Yes — UCP319 is an assembly of the P319 housing and UC319D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 95 mm shaft are not the reason the old insert failed.
What are the dimensions of an UCP319 mounted bearing?
UCP319 takes a 95 mm shaft (insert UC319D1, 200 mm OD) and has a unit mass of about 26.0 kg. Housing figures: centre height H 125 mm, length L 470 mm, bolt centres J 360 mm, foot holes 36 mm for M30 bolts.
What does the UCP319 designation mean?
UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 3 is the duty series; the last digits encode the 95 mm bore. UCP319 is built from housing P319 plus insert UC319D1 (D1 = greasable).
Reviewed & verified by the MPN Base engineering desk against source catalog CAT. No. 2203-3/E 2024 on 2026-09-25. Read our editorial & correction policy.