UCFL317 bearing: complete specifications & equivalents
The UCFL317 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 | 15000 g |
| Housing height H | 370 mm |
| Housing overall length L | 220 mm |
| Mounting bolt center distance J | 300 mm |
| Mounting hole diameter N | 38 mm |
| Manufacturer designation | UCFL317 |
| 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 | 3.346 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 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) | 17 of 25 |
| Bore above smallest UCFL-series size | 73 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL317 | 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 UCFL317 model number is decoded
In NTN's mounted-bearing range, UCFL317 is the two-bolt rhombus flange option for a 85 mm shaft: insert UC317D1, housing FL317, through-bolt mounting. NTN's numbering ties the unit to its components: UCFL317 means the FL317 housing carrying the UC317D1 insert, with the last two digits denoting the 85 mm bore in the 3-series duty class. The mounting detail needs four numbers: H 370 mm flange height, L 220 mm across the ears, J 300 mm between the 38 mm holes, and a 85 mm shaft through the 180 mm OD UC317D1 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. 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. 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 UC317D1 insert are 147 kN dynamic and 97 kN static; the assembled UCFL317 weighs about 15.0 kg.
Typical equipment & failure modes
Common applications
- quarry feeder and transfer drives
- sawmill arbors and feed rolls
- cement and clinker handling
- frequent stop-start and reversing duty such as shuttle and tripper conveyors
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
- The 3-series insert makes UCFL317 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 rhombus flange, UCFL317 pulls against the frame through only two M33 bolts on 300 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
- When ordering covers for UCFL317, note the steel and cast-iron cover executions change the unit mass and envelope but not the 300 mm mounting centres.
- Heavy drives on UCFL317 should have the setscrews re-torqued after the first day; at 85 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 UCFL317 mounted bearing?
UCFL317 takes a 85 mm shaft (insert UC317D1, 180 mm OD) and has a unit mass of about 15.0 kg. Flange figures: height H 370 mm, length L 220 mm, bolt centres J 300 mm, holes 38 mm for M33 bolts.
What does the UCFL317 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 85 mm bore. UCFL317 is built from housing FL317 plus insert UC317D1 (D1 = greasable).
How is UCFL317 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 rhombus flange unit like UCFL317 instead of a pillow block?
Choose the UCFL317 two-bolt flange when the 85 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M33 bolts on 300 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface.
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.