UCFL326 bearing: complete specifications & equivalents
The UCFL326 is a JIS B 1559 radial bearing sized 130 x 280 x 135 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 | 130 mm |
| Outer diameter D | 280 mm |
| Width B | 135 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 254 kN |
| Basic static load rating C0 | 214 kN |
| Fatigue load limit Pu | 11.7 kN |
| Mass | 58000 g |
| Housing height H | 550 mm |
| Housing overall length L | 360 mm |
| Mounting bolt center distance J | 460 mm |
| Mounting hole diameter N | 47 mm |
| Manufacturer designation | UCFL326 |
| 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 | 5.118 in |
|---|---|
| Outer diameter D | 11.024 in |
| Width B | 5.315 in |
| ISO bore code | 26 |
| Radial section height (D−d)/2 | 75 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) | 24 of 25 |
| Bore above smallest UCFL-series size | 118 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL326 | 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 UCFL326 model number is decoded
In NTN's mounted-bearing range, UCFL326 is the two-bolt rhombus flange option for a 130 mm shaft: insert UC326D1, housing FL326, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL326 means the FL326 housing carrying the UC326D1 insert, with the last two digits denoting the 130 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 550 mm flange height, L 360 mm across the ears, J 460 mm between the 47 mm holes, and a 130 mm shaft through the 280 mm OD UC326D1 insert. 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. At the top of the range the units weigh tens of kilograms and use foundation bolts of M30 and larger; installation is a lifting, alignment and grouting exercise, not hand fitting. Small marine and dockside conveyors use this unit with stainless fasteners through the feet; the cast iron tolerates salt atmosphere far better than pressed-steel housings once paint is chipped. In wet or washdown positions, orient the grease fitting at 45° and purge after every wash; water trapped between the slinger and lip seal emulsifies the grease even when the unit is sealed. Basic ratings of the UC326D1 insert are 254 kN dynamic and 214 kN static; the assembled UCFL326 weighs about 58.0 kg.
Typical equipment & failure modes
Common applications
- steel-plant roller tables
- large induced-draft fans
- quarry and aggregate screens
- vibrating feeder and screen-adjacent positions where setscrew retorque is routine
Known failure patterns
- over-greasing that churns the charge, overheats the bearing and blows the seal lip
- cracked cast ear from mounting on an uneven face and pulling one bolt fully first
- housing-foot cracking beside an over-torqued or under-supported foundation bolt
Selection pitfalls — read before you substitute
- UCFL326 is located on the shaft by setscrews only; for shock reversing drives consider an adapter-lock insert family instead, since setscrew points indent the 130 mm journal over time.
- Foundation design for UCFL326 must resist the belt-pull reaction at 550 mm centre height — a moment arm this large walks an inadequately anchored base under load.
- The 3-series insert makes UCFL326 the highest-rated unit at 130 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
- As a rhombus flange, UCFL326 pulls against the frame through only two M42 bolts on 460 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
Frequently asked questions
How is UCFL326 locked to the shaft, and how tight should the setscrews be?
The UC326D1 insert uses two collar setscrews on the 130 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 UCFL326 instead of a pillow block?
Choose the UCFL326 two-bolt flange when the 130 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M42 bolts on 460 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface.
What are the dimensions of an UCFL326 mounted bearing?
UCFL326 takes a 130 mm shaft (insert UC326D1, 280 mm OD) and has a unit mass of about 58.0 kg. Flange figures: height H 550 mm, length L 360 mm, bolt centres J 460 mm, holes 47 mm for M42 bolts.
What does the UCFL326 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 130 mm bore. UCFL326 is built from housing FL326 plus insert UC326D1 (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.