UCP313 bearing: complete specifications & equivalents
The UCP313 is a JIS B 1559 radial bearing sized 65 x 140 x 75 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 | 65 mm |
| Outer diameter D | 140 mm |
| Width B | 75 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 103 kN |
| Basic static load rating C0 | 60 kN |
| Fatigue load limit Pu | 4.6 kN |
| Mass | 10000 g |
| Housing height H | 90 mm |
| Housing overall length L | 340 mm |
| Mounting bolt center distance J | 260 mm |
| Mounting hole diameter N | 25 mm |
| Manufacturer designation | UCP313 |
| 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 | 2.559 in |
|---|---|
| Outer diameter D | 5.512 in |
| Width B | 2.953 in |
| ISO bore code | 13 |
| Radial section height (D−d)/2 | 37.5 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) | 13 of 25 |
| Bore above smallest UCP-series size | 53 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCP313 | 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 UCP313 model number is decoded
A 65 mm bore upright mounted bearing, NTN UCP313 combines the UC313D1 self-aligning insert with the grey-iron P313 pillow block base. NTN's numbering ties the unit to its components: UCP313 means the P313 housing carrying the UC313D1 insert, with the last two digits denoting the 65 mm bore in the 3-series duty class. The foundation drawing needs four numbers: H 90 mm centre height, L 340 mm total length, J 260 mm between the 25 mm bolt holes, and a 65 mm shaft passing through the 140 mm OD insert. 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. In this bore band the X and 3 sections start to outsell the standard section: longer bearing centres and tensioned belt drives use the extra rating and stiffer base that the heavier housings provide. Mining feeder and screen-feeder drives use the heaviest available section at this bore: the base must resist belt-pull reaction, and crews grout the sole rather than bolting to bare plate. For the flanged form, the mounting face must be flat within the housing’s own tolerance; a weld bead or plate step under one ear twists the housing and binds the insert even though the shaft looks centred. Basic ratings of the UC313D1 insert are 103 kN dynamic and 60 kN static; the assembled UCP313 weighs about 10.0 kg.
Typical equipment & failure modes
Common applications
- sugar-mill and fertiliser plant drives
- heavy bulk-handling conveyors
- process fans and induced-draft drives
- low-speed heavily loaded pulleys where the static rating governs the selection
Known failure patterns
- lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear
- spherical-seat fretting that welds insert to housing and destroys the self-aligning action
- water-emulsified grease after washdown with the fitting facing upward
Selection pitfalls — read before you substitute
- As a pillow block, UCP313 needs a prepared horizontal surface at the 90 mm centre height: shim both feet with full-width packs so the 340 mm base seats over its full area.
- The D1 suffix on UC313D1 means the greasable execution; a unit without it has no fitting path, so do not assume every UCP313 on site accepts relubrication.
- Self-aligning is not the same as free to move: the UC313D1 insert of UCP313 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.
- Heavy drives on UCP313 should have the setscrews re-torqued after the first day; at 65 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.
- The 3-series insert makes UCP313 the highest-rated unit at 65 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
Frequently asked questions
What does the UCP313 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 65 mm bore. UCP313 is built from housing P313 plus insert UC313D1 (D1 = greasable).
How is UCP313 locked to the shaft, and how tight should the setscrews be?
The UC313D1 insert uses two collar setscrews on the 65 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 UCP313 instead of a flanged unit?
Choose the UCP313 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 90 mm above the 340 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
Is the UCP313 bearing self-aligning?
Yes within limits. The UC313D1 insert has a spherical outer diameter that pivots in the P313 housing bore, compensating for a few degrees of static misalignment between shaft and foundation. It does not compensate for a bent shaft or dynamic deflection while running.
What are the dimensions of an UCP313 mounted bearing?
UCP313 takes a 65 mm shaft (insert UC313D1, 140 mm OD) and has a unit mass of about 10.0 kg. Housing figures: centre height H 90 mm, length L 340 mm, bolt centres J 260 mm, foot holes 25 mm for M20 bolts.
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.