SNRUCFL.2062-Bolt Oval Flange Ball Bearing Unit 30 mm Bore, Setscrew Locking, Self-Aligning, Cast Iron

Product Description

What this part is

An NTN-SNR UCFL.206 mounted ball bearing unit — a two-bolt oval flange housing in cast iron for a 30 mm shaft. The insert is a ball bearing with an extended inner ring and setscrew locking, seated spherically in the housing so the unit accommodates moderate initial misalignment. It bolts to a machine wall or frame through two holes.

Decoding the designation

UC = insert ball bearing with an extended inner ring and setscrew locking. FL = oval, two-bolt flange housing. 206 = the 206 bearing envelope, giving a 30 mm bore. UCFL206 is a JIS-standard pattern, so the housing dimensions below are common across makers.

Correcting the source data

Earlier copy hedged between pillow block and flange unit. It is a two-bolt oval flange. A pillow block (UCP206) mounts below the shaft on a horizontal base and has a completely different footprint; the four-bolt square flange in this envelope is UCFU206 or UCF206. Bolt count and pattern are part of the housing style, so count the holes before ordering.

Published ratings and mounting data

Housing style: oval two-bolt flange, cast iron, JIS patternBore / shaft size: 30 mmDistance between attachment bolts (J): 117 mmOverall length: 148 mm · overall height (H): 147.5 mmOverall width (T): 40.2 mmWidth of inner ring (B): 38.1 mmTop external diameter (Db1): 80 mmBolt hole size (N): 16 mm, for M14 fastenersLocking method: set screws in the extended inner ring, 1/4-28 UNFBasic dynamic load rating C: 19.5 kNBasic static load rating C0: 11.2 kNFatigue load limit Pu: 0.475 kNLimiting speed: 5,000 rpmGrease fitting: 1/4-28 UNFWeight: approx. 0.94 kg

What these specs mean in practice

Take the 117 mm bolt centres and the 40.2 mm overall width to your machine before ordering — those two numbers decide whether the unit fits, and both are what buyers get wrong. The 147.5 mm overall height is the flange face dimension, not a shaft centre height; on a flange unit the shaft line is set by your mounting hole position, not by the housing.

Setscrew locking is rated by the maker for constant or alternating direction of rotation, so this suits reversing drives where an eccentric collar would risk backing off. It does indent the shaft, so plan the position before you tighten.

Ball bearing units accommodate moderate initial misalignment but normally do not permit axial displacement, so treat this as a locating position and let the other end of the shaft take up thermal growth.

Quantity and configuration

Sold as 1 pc — one complete unit, cast iron flange housing with the insert and setscrews fitted. Mounting bolts and end covers are not included.

Fitting notes

Bolt to a flat, square face and shim rather than pulling the flange onto a high spot. Slide onto the shaft, position, then torque both setscrews evenly. Rotate the shaft by hand and confirm the insert still swivels in its seat, then purge the grease path through the fitting before running.

Interchange guidance

UCFL206 is a JIS pattern, so it interchanges dimensionally with UCFL206 units from NTN, FYH, Koyo, Timken, SKF (Y/UCFL 206) and others at 30 mm bore. Related, not interchangeable: UCP206 pillow block, UCF206 / UCFU206 four-bolt square flange, and UCFC206 round piloted flange — all the same insert in a different housing. UEL and JEL inserts of the same envelope use a collar instead of setscrews and are a different order code.