UCP314 bearing: complete specifications & equivalents
The UCP314 is a JIS B 1559 radial bearing sized 70 x 150 x 78 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 | 70 mm |
| Outer diameter D | 150 mm |
| Width B | 78 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 115 kN |
| Basic static load rating C0 | 68 kN |
| Fatigue load limit Pu | 5.1 kN |
| Mass | 12000 g |
| Housing height H | 95 mm |
| Housing overall length L | 360 mm |
| Mounting bolt center distance J | 280 mm |
| Mounting hole diameter N | 27 mm |
| Manufacturer designation | UCP314 |
| 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 | 2.756 in |
|---|---|
| Outer diameter D | 5.906 in |
| Width B | 3.071 in |
| ISO bore code | 14 |
| Radial section height (D−d)/2 | 40 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) | 14 of 25 |
| Bore above smallest UCP-series size | 58 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCP314 | 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 UCP314 model number is decoded
UCP314 is an NTN cast-iron pillow block — a setscrew-locking wide-inner-ring ball bearing (UC314D1) pre-assembled in a P314 two-bolt plummer housing. On the nameplate, UCP314 decodes as a UC wide-inner-ring insert in a P plummer block, 3-series duty, 70 mm bore; the UC314D1 designation shows the D1 greasable execution. Boundary data for the 70 mm bore: housing centre height 95 mm, base 360 mm, mounting centres 280 mm for M22 fasteners through 27 mm holes; the UC314D1 insert itself is 150 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 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. HVAC air-handling units carry fan shafts on this size, usually in warm roof-space air where the grease must be rated for continuous ambient temperature rather than load. On V-belt drives, align the pulleys before finally tightening the feet; the spherical seat lets you rotate the unit, but sliding the whole base on the foundation is what removes the belt-edge wear. Basic ratings of the UC314D1 insert are 115 kN dynamic and 68 kN static; the assembled UCP314 weighs about 12.0 kg.
Typical equipment & failure modes
Common applications
- heavy bulk-handling conveyors
- process fans and induced-draft drives
- quarry feeder and transfer drives
- cold-store and winter-outdoor service needing low-temperature grease
Known failure patterns
- housing-foot cracking beside an over-torqued or under-supported foundation bolt
- grease starvation on long intervals in hot positions, with the ball set running on dried thickener
- fretting corrosion of the shaft journal under the wide inner ring after years of micro-creep
Selection pitfalls — read before you substitute
- Never weld a bracket to the P314 housing of UCP314: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- At 70 mm bore the 360 mm base of UCP314 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.
- The 3-series insert makes UCP314 the highest-rated unit at 70 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
- As a pillow block, UCP314 needs a prepared horizontal surface at the 95 mm centre height: shim both feet with full-width packs so the 360 mm base seats over its full area.
Frequently asked questions
How is UCP314 locked to the shaft, and how tight should the setscrews be?
The UC314D1 insert uses two collar setscrews on the 70 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 UCP314 instead of a flanged unit?
Choose the UCP314 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 95 mm above the 360 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
What are the dimensions of an UCP314 mounted bearing?
UCP314 takes a 70 mm shaft (insert UC314D1, 150 mm OD) and has a unit mass of about 12.0 kg. Housing figures: centre height H 95 mm, length L 360 mm, bolt centres J 280 mm, foot holes 27 mm for M22 bolts.
What does the UCP314 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 70 mm bore. UCP314 is built from housing P314 plus insert UC314D1 (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.