UCP317 bearing: complete specifications & equivalents
The UCP317 is a JIS B 1559 radial bearing sized 85 x 180 x 96 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 | 85 mm |
| Outer diameter D | 180 mm |
| Width B | 96 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 147 kN |
| Basic static load rating C0 | 97 kN |
| Fatigue load limit Pu | 6.55 kN |
| Mass | 19000 g |
| Housing height H | 112 mm |
| Housing overall length L | 420 mm |
| Mounting bolt center distance J | 320 mm |
| Mounting hole diameter N | 33 mm |
| Manufacturer designation | UCP317 |
| 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 | 3.346 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 3.78 in |
| ISO bore code | 17 |
| Radial section height (D−d)/2 | 47.5 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) | 17 of 25 |
| Bore above smallest UCP-series size | 73 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCP317 | 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 UCP317 model number is decoded
NTN ships the UCP317 as a matched assembly — UC317D1 insert swaged into the P317 cast-iron pillow block — so the fitter never has to set bearing-to-housing clearance. The code breaks down as insert family UC, housing form P (pillow block), duty series 3, bore code ending in the 85 mm shaft size; the unit is built from insert UC317D1 and housing P317. For layout work on UCP317: the 85 mm shaft centre sits 112 mm above the sole (H), the footprint is 420 mm long (L), bolt centres are 320 mm (J), and the foot holes suit M27 (33 mm) bolts. 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. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UC317D1 insert are 147 kN dynamic and 97 kN static; the assembled UCP317 weighs about 19.0 kg.
Typical equipment & failure modes
Common applications
- sawmill arbors and feed rolls
- cement and clinker handling
- sugar-mill and fertiliser plant drives
- washdown-duty food and pharmaceutical areas using purge relubrication
Known failure patterns
- 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
- lip-seal failure from grit past the slinger, followed by grease loss and abrasive wear
Selection pitfalls — read before you substitute
- The 3-series insert makes UCP317 the highest-rated unit at 85 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
- As a pillow block, UCP317 needs a prepared horizontal surface at the 112 mm centre height: shim both feet with full-width packs so the 420 mm base seats over its full area.
- Do not confuse UCP317 with a bare UC317D1 bearing: replacing only the insert is possible, but the housing P317 must be unworn and the spherical seat cleaned and coated with anti-seize.
- When ordering covers for UCP317, note the steel and cast-iron cover executions change the unit mass and envelope but not the 320 mm mounting centres.
- At 85 mm bore the 420 mm base of UCP317 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.
Frequently asked questions
What are the dimensions of an UCP317 mounted bearing?
UCP317 takes a 85 mm shaft (insert UC317D1, 180 mm OD) and has a unit mass of about 19.0 kg. Housing figures: centre height H 112 mm, length L 420 mm, bolt centres J 320 mm, foot holes 33 mm for M27 bolts.
What does the UCP317 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 85 mm bore. UCP317 is built from housing P317 plus insert UC317D1 (D1 = greasable).
How is UCP317 locked to the shaft, and how tight should the setscrews be?
The UC317D1 insert uses two collar setscrews on the 85 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 UCP317 instead of a flanged unit?
Choose the UCP317 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 112 mm above the 420 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
How often should I relubricate an UCP317 unit?
There is no single interval for UCP317: the UC317D1 insert is regreased through the D1 fitting while the shaft turns, using an NLGI 2 lithium or lithium-complex grease. Quarterly is typical for normal ambient conveyor duty; shorten to weekly or monthly where temperatures exceed about 70 °C, water is present, or dust is heavy.
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.