UCFL316 bearing: complete specifications & equivalents
The UCFL316 is a JIS B 1559 radial bearing sized 80 x 170 x 86 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 | 80 mm |
| Outer diameter D | 170 mm |
| Width B | 86 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 136 kN |
| Basic static load rating C0 | 86.5 kN |
| Fatigue load limit Pu | 6.05 kN |
| Mass | 13000 g |
| Housing height H | 355 mm |
| Housing overall length L | 210 mm |
| Mounting bolt center distance J | 285 mm |
| Mounting hole diameter N | 38 mm |
| Manufacturer designation | UCFL316 |
| 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 | 3.15 in |
|---|---|
| Outer diameter D | 6.693 in |
| Width B | 3.386 in |
| ISO bore code | 16 |
| Radial section height (D−d)/2 | 45 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) | 16 of 25 |
| Bore above smallest UCFL-series size | 68 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCFL316 | 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 UCFL316 model number is decoded
The NTN UCFL316 flanged unit combines a sealed UC316D1 insert with a diamond-shaped FL316 cast-iron housing that bolts flat against a machine frame. The code breaks down as insert family UC, housing form FL (flange), duty series 3, bore code ending in the 80 mm shaft size; the unit is built from insert UC316D1 and housing FL316. For the frame-face drawing of UCFL316: the two holes are 285 mm apart (J), the rhombus spans 210 mm (L) and 355 mm (H), and M33 (38 mm) bolts clamp it around the 80 mm shaft. 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. Large-bore mounted units like this are selected on calculated bearing life plus foundation quality — the cast base is now a structural part of the drive, not just a convenient clamp. Bottle, can and carton conveyor lines run dozens of these units per line, so the decision is driven by interchange stock and the time to swap a failed unit during a change window. Never mount by striking the insert or its inner ring: press or drive on the housing only. Impact through the rolling elements transmits straight to the seals and leaves brinell marks that announce themselves as noise weeks later. Basic ratings of the UC316D1 insert are 136 kN dynamic and 86.5 kN static; the assembled UCFL316 weighs about 13.0 kg.
Typical equipment & failure modes
Common applications
- process fans and induced-draft drives
- quarry feeder and transfer drives
- sawmill arbors and feed rolls
- fan drives where belt tension, not transmitted torque, sets the radial load
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 UCFL316 the highest-rated unit at 80 mm; its advantage disappears on a soft foundation, so spend the saved margin on base stiffness rather than skipping shims.
- As a rhombus flange, UCFL316 pulls against the frame through only two M33 bolts on 285 mm centres; the mounting plate must be stiff enough not to bend between them under belt load.
- The lip seals and slingers on UCFL316 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.
- Never weld a bracket to the FL316 housing of UCFL316: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- UCFL316 at 80 mm uses M33 bolts that need a torque wrench and a cross pattern; pulling one bolt first tips the 355 mm centre height and binds the insert.
Frequently asked questions
What are the dimensions of an UCFL316 mounted bearing?
UCFL316 takes a 80 mm shaft (insert UC316D1, 170 mm OD) and has a unit mass of about 13.0 kg. Flange figures: height H 355 mm, length L 210 mm, bolt centres J 285 mm, holes 38 mm for M33 bolts.
What does the UCFL316 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 80 mm bore. UCFL316 is built from housing FL316 plus insert UC316D1 (D1 = greasable).
How is UCFL316 locked to the shaft, and how tight should the setscrews be?
The UC316D1 insert uses two collar setscrews on the 80 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 UCFL316 instead of a pillow block?
Choose the UCFL316 two-bolt flange when the 80 mm shaft meets a vertical frame or side plate: the diamond housing bolts flush with two M33 bolts on 285 mm centres. A UCP pillow block is used when the shaft runs above a horizontal mounting surface.
How often should I relubricate an UCFL316 unit?
There is no single interval for UCFL316: the UC316D1 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.