NTNUCFLUX-1.7/162-Bolt Flange Ball Bearing Unit 1-7/16″ Bore, Medium Duty, Setscrew Locking, Seal and Flinger Both Sides

Product Description

What this part is

An NTN UCFLUX-1.7/16 mounted ball bearing unit — a two-bolt cast flange housing for a 1-7/16 inch shaft, in the medium-duty size. The insert is a wide inner ring ball bearing with setscrew locking and a flinger behind the contact seal on each side. It seats spherically in the housing, so the unit takes up moderate misalignment at installation.

Decoding the designation

UC = NTN wide inner ring insert, setscrew locking, with flinger. FLU = flanged unit, cast housing, two bolt. X = medium duty (the X series, larger balls and a heavier insert than the standard 2 series). 1.7/16 = 1-7/16 inch shaft diameter.

Housing style, read this before ordering

FLU is a two-bolt flange. NTN’s four-bolt square flange is FU, and its cast rhombus flange is FA — different bolt patterns that will not sit in a two-bolt footprint. This is also not a pillow block (NTN P or PL). Bolt count and pattern are part of the housing style, so count the holes on the housing you are replacing rather than going by bore alone.

Published specifications

Housing style: 2-bolt flanged unit, cast housingBore / shaft size: 1-7/16 in (36.51 mm)Duty series: X, medium dutyInsert: wide inner ring ball bearing, spherical outer raceLocking method: set screws in the extended inner ringClosure: contact seal plus flinger, both sidesSelf-aligning: yesRelubrication: yes, grease fittingRolling elements: ball · number of rows: 1Design units: inch

What these specs mean in practice

The X duty series is the reason to pick this over a plain UCFLU. Medium duty means a heavier insert and larger balls in the same nominal bore, so it carries more radial load and tolerates shock better on screw conveyors, crushers and other lumpy duty. It also means the housing is physically larger than the standard-series unit of the same bore, which is exactly the trap when substituting — check flange dimensions, not just the shaft size.

Setscrew locking is quick and holds in either direction of rotation, but it indents the shaft, so treat the position as fixed once it is set. The flinger behind each seal throws contamination away from the seal lip, which is why the UC insert outlasts a plain shielded bearing in dusty work.

Quantity and configuration

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

Fitting notes

Bolt to a flat, square face; a distorted mounting face preloads the spherical seat and consumes the misalignment allowance. Slide onto the shaft, position, then torque both setscrews evenly to the NTN figure. Rotate by hand, confirm the insert still swivels, and purge the grease path with fresh compatible grease before running.

Interchange guidance

Two-bolt flange units at 1-7/16 in bore also come from SealMaster (SF), Rexnord (KF), Hub City (FB), Dodge (F2B) and SKF (FYT). Flange face dimensions and bolt centres differ by maker, and the medium-duty envelope differs again, so measure before treating any of them as a drop-in. Related, not interchangeable: UCFLU-1.7/16 is the standard-duty version in a smaller housing, and UCFUX-1.7/16 is the same medium-duty insert in a four-bolt square flange.