UCP208 bearing: complete specifications & equivalents
The UCP208 is a JIS B 1559 radial bearing sized 40 x 80 x 49.2 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 | 40 mm |
| Outer diameter D | 80 mm |
| Width B | 49.2 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 32.5 kN |
| Basic static load rating C0 | 17.8 kN |
| Fatigue load limit Pu | 1.24 kN |
| Mass | 1900 g |
| Housing height H | 49.2 mm |
| Housing overall length L | 184 mm |
| Mounting bolt center distance J | 137 mm |
| Mounting hole diameter N | 17 mm |
| Manufacturer designation | UCP208 |
| 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 | 1.575 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 1.937 in |
| ISO bore code | 08 |
| Radial section height (D−d)/2 | 20 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) | 8 of 25 |
| Bore above smallest UCP-series size | 28 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCP208 | 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 UCP208 model number is decoded
In NTN's mounted-ball-bearing range, UCP208 is the classic upright pillow block for a 40 mm shaft: insert UC208D1, housing P208, two foundation bolts. Reading the designation: UC marks the wide-inner-ring, setscrew-locking insert; P marks the upright pillow block housing; the 2 code identifies the duty series and the final two digits encode the 40 mm bore. Key mounting figures: centre height H = 49.2 mm, overall base length L = 184 mm, bolt-hole spacing J = 137 mm, and each of the two feet takes a 17 mm (M14) fastener for the 40 mm shaft. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. 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. This mid bore range dominates agricultural and bulk-handling builds, where standard shafts, cast feet and greasable inserts keep replacement a stock-room, not a workshop, exercise. Crane and hoist travel drives occasionally use this unit when the shaft runs parallel to the rail: the pillow base bolts to a machined trolley plate and survives repeated travel shocks. When a shaft journal is scored under the setscrew points, do not rotate the insert to a fresh spot on the same shaft — sleeve the journal or move the unit, or the indentations let the ring creep again. Basic ratings of the UC208D1 insert are 32.5 kN dynamic and 17.8 kN static; the assembled UCP208 weighs about 1.9 kg.
Typical equipment & failure modes
Common applications
- agricultural augers and bucket elevators
- small crushers and screening feeds
- textile line-shafting
- wet, abrasive or chemically aggressive environments relying on the lip seals and slingers
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
- UCP208 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 40 mm journal over time.
- The standard section of UCP208 can look adequate at 40 mm while the X or 3 section is the real choice for long conveyor centres; compare ratings rather than fitting the same unit line-wide.
- The standard 2-series insert in UCP208 is the lightest section at 40 mm — do not substitute it into a position that previously ran an X or 3 unit: the 137 mm mounting may match while the load rating does not.
- As a pillow block, UCP208 needs a prepared horizontal surface at the 49.2 mm centre height: shim both feet with full-width packs so the 184 mm base seats over its full area.
Frequently asked questions
How is UCP208 locked to the shaft, and how tight should the setscrews be?
The UC208D1 insert uses two collar setscrews on the 40 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 UCP208 instead of a flanged unit?
Choose the UCP208 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 49.2 mm above the 184 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 UCP208 mounted bearing?
UCP208 takes a 40 mm shaft (insert UC208D1, 80 mm OD) and has a unit mass of about 1.9 kg. Housing figures: centre height H 49.2 mm, length L 184 mm, bolt centres J 137 mm, foot holes 17 mm for M14 bolts.
What does the UCP208 designation mean?
UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 40 mm bore. UCP208 is built from housing P208 plus insert UC208D1 (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.