UCFL319 bearing: complete specifications & equivalents
The UCFL319 is a JIS B 1559 radial bearing sized 95 x 200 x 103 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 | 95 mm |
| Outer diameter D | 200 mm |
| Width B | 103 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 169 kN |
| Basic static load rating C0 | 119 kN |
| Fatigue load limit Pu | 7.65 kN |
| Mass | 23000 g |
| Housing height H | 405 mm |
| Housing overall length L | 250 mm |
| Mounting bolt center distance J | 330 mm |
| Mounting hole diameter N | 41 mm |
| Manufacturer designation | UCFL319 |
| 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 & UCFL-series range
| Bore d | 3.74 in |
|---|---|
| Outer diameter D | 7.874 in |
| Width B | 4.055 in |
| ISO bore code | 19 |
| Radial section height (D−d)/2 | 52.5 mm |
| Smallest bore in UCFL-series | 12 mm |
| Largest outer diameter in UCFL-series | 300 mm |
| Width range across UCFL-series | 31–145 mm |
| Bore position in UCFL-series (smallest first) | 19 of 25 |
| Bore above smallest UCFL-series size | 83 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL319 | 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 UCFL319 model number is decoded
UCFL319 belongs to NTN's UCFL line of two-bolt rhombus flanged units, built on a JIS B 1558 UC319D1 insert in a JIS B 1559 FL319 housing. The UCFL319 number follows NTN's mounted-unit convention: housing letter FL, 3-series section, bore code for 95 mm; FL319 and UC319D1 are the separate housing and insert part numbers inside. Shaft size is 95 mm; the 405 mm overall-height flange is 250 mm long across the rhombus (L), with its two mounting holes on 330 mm centres (J) clearing 41 mm M36 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 diamond flange carries the shaft square to a vertical face — a welded frame, side plate or gearbox wall — so no base plinth and no shim pack under the bearing are required. Units in this bore class live in quarries, steel plants and port equipment: the ratings are high, but dust, water and foundation movement — not fatigue — usually decide the service life. Cement plant clinker conveyors fit this size under insulation and heat shields; radiant heat dictates both the grease grade and a relubrication interval far shorter than the load alone would suggest. If the unit is the locating bearing, clamp the inner ring with both setscrews and keep the housing feet tight; the opposite unit on the shaft must be the float design with slots, or thermal growth preloads both bearings. Basic ratings of the UC319D1 insert are 169 kN dynamic and 119 kN static; the assembled UCFL319 weighs about 23.0 kg.
Typical equipment & failure modes
Common applications
- quarry and aggregate screens
- ship-loader and stacker drives
- mining and port conveyor pulleys
- cold-store and winter-outdoor service needing low-temperature grease
Known failure patterns
- 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
- spherical-seat fretting that welds insert to housing and destroys the self-aligning action
Selection pitfalls — read before you substitute
- Never weld a bracket to the FL319 housing of UCFL319: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- XL units like UCFL319 (95 mm bore, M36 bolts) are grouted, shimmed and aligned as civil works; bolting them straight to bare plate guarantees movement and foot cracking.
- The 3-series insert makes UCFL319 the highest-rated unit at 95 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
- As a rhombus flange, UCFL319 pulls against the frame through only two M36 bolts on 330 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
Frequently asked questions
How is UCFL319 locked to the shaft, and how tight should the setscrews be?
The UC319D1 insert uses two collar setscrews on the 95 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 rhombus flange unit like UCFL319 instead of a pillow block?
Choose the UCFL319 two-bolt flange when the 95 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M36 bolts on 330 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface.
What are the dimensions of an UCFL319 mounted bearing?
UCFL319 takes a 95 mm shaft (insert UC319D1, 200 mm OD) and has a unit mass of about 23.0 kg. Flange figures: height H 405 mm, length L 250 mm, bolt centres J 330 mm, holes 41 mm for M36 bolts.
What does the UCFL319 designation mean?
UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; FL the two-bolt rhombus flange housing; 3 is the duty series; the last digits encode the 95 mm bore. UCFL319 is built from housing FL319 plus insert UC319D1 (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.