UCP316 bearing: complete specifications & equivalents
The UCP316 is a JIS B 1559 radial bearing sized 80 x 170 x 86 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 | 80 mm |
| Outer diameter D | 170 mm |
| Width B | 86 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 136 kN |
| Basic static load rating C0 | 86.5 kN |
| Fatigue load limit Pu | 6.05 kN |
| Mass | 17000 g |
| Housing height H | 106 mm |
| Housing overall length L | 400 mm |
| Mounting bolt center distance J | 300 mm |
| Mounting hole diameter N | 27 mm |
| Manufacturer designation | UCP316 |
| 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 | 3.15 in |
|---|---|
| Outer diameter D | 6.693 in |
| Width B | 3.386 in |
| ISO bore code | 16 |
| Radial section height (D−d)/2 | 45 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) | 16 of 25 |
| Bore above smallest UCP-series size | 68 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCP316 | 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 UCP316 model number is decoded
In NTN's mounted-ball-bearing range, UCP316 is the classic upright pillow block for a 80 mm shaft: insert UC316D1, housing P316, two foundation bolts. 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 80 mm bore. Key mounting figures: centre height H = 106 mm, overall base length L = 400 mm, bolt-hole spacing J = 300 mm, and each of the two feet takes a 27 mm (M22) fastener for the 80 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. 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. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC316D1 insert are 136 kN dynamic and 86.5 kN static; the assembled UCP316 weighs about 17.0 kg.
Typical equipment & failure modes
Common applications
- quarry feeder and transfer drives
- sawmill arbors and feed rolls
- cement and clinker handling
- elevated-temperature positions where grease life, not bearing rating, sets the interval
Known failure patterns
- spherical-seat fretting that welds insert to housing and destroys the self-aligning action
- 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
Selection pitfalls — read before you substitute
- The 3-series insert makes UCP316 the highest-rated unit at 80 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
- As a pillow block, UCP316 needs a prepared horizontal surface at the 106 mm centre height: shim both feet with full-width packs so the 400 mm base seats over its full area.
- Self-aligning is not the same as free to move: the UC316D1 insert of UCP316 pivots to correct static misalignment, but a continuously bending shaft still frets the spherical seat.
- Heavy drives on UCP316 should have the setscrews re-torqued after the first day; at 80 mm bore the seating forces are large and a loose inner ring frets the shaft in weeks.
Frequently asked questions
What are the dimensions of an UCP316 mounted bearing?
UCP316 takes a 80 mm shaft (insert UC316D1, 170 mm OD) and has a unit mass of about 17.0 kg. Housing figures: centre height H 106 mm, length L 400 mm, bolt centres J 300 mm, foot holes 27 mm for M22 bolts.
What does the UCP316 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 80 mm bore. UCP316 is built from housing P316 plus insert UC316D1 (D1 = greasable).
How is UCP316 locked to the shaft, and how tight should the setscrews be?
The UC316D1 insert uses two collar setscrews on the 80 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 UCP316 instead of a flanged unit?
Choose the UCP316 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 106 mm above the 400 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
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.