UCP326 Bearing Dimensions

UCP326 compared with nearby sizes and housings

UCP326 is a pillow block unit that holds the UC326 insert on a 130 mm shaft: centre height H 180 mm, base length L 600 mm and overall height H0 355 mm with M33 bolts.

The same 326 size is also made as UCFL326 (oval flange unit, d 130 · L 550 · J 460 mm). All of them take the same UC326 insert, so a worn insert can be changed without changing the housing type.

UCP328 is the next larger size in the same series on this site: shaft d 140 mm (10 mm more), inner ring width B 145 mm (10 mm more), centre height H 200 mm (20 mm more), length L 620 mm (20 mm more), bolt spacing J 500 mm (20 mm more) and overall height H0 390 mm (35 mm more).

UCP321 is the next smaller size in the same series on this site: shaft d 105 mm (25 mm less), inner ring width B 112 mm (23 mm less), centre height H 140 mm (40 mm less), length L 490 mm (110 mm less), bolt spacing J 380 mm (100 mm less) and overall height H0 280 mm (75 mm less), and it takes M30 bolts instead of M33.

Dimensions in mm from the model pages; weight from FULI's catalog, — = not listed on this site.

UCP326 load ratings

FULI's catalog has no load rating line for UCP326 itself, so none is given here. The ratings of the UC326 insert are on its own page. Ask us and we send the figures with the quotation.

UCP326 dimensions in inches

The nearest common inch shaft size to the 130 mm bore of UCP326 is 5-1/8 in (130.18 mm), 0.18 mm larger than the bore, so UCP326 will not go on it. An inch shaft needs an inch bore insert. Inch bore versions are made for some sizes; ask us with the shaft size.

Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.

Mounting UCP326 (general guidance)

General guidance, not a FULI specification: insert bearings slide onto the shaft rather than being pressed on, and are held by their locking device. A shaft ground or drawn to h7 is common; a closer shaft such as js7 or j7 suits higher speed.

The UC326 insert in UCP326 is locked by set screws in the extended inner ring. Housed-unit problems usually start at the set screws: if the inner ring is not held, it turns on the shaft and wears it. Tighten each screw to the torque in the mounting instructions, and check them again after the first hours of running.

Bolt UCP326 down with M33 bolts at 480 mm spacing on a flat, rigid face. Line up the two housings on a shaft before tightening the bolts fully, then lock the inserts, so the shaft is not bent between them.

Grease for UCP326

The insert in UCP326 is sealed on both sides and greased at the factory. If the housing has a grease fitting, add grease slowly through it while the shaft turns until a little fresh grease shows at the seals; general practice is to relubricate more often in wet or dusty places.

Greases for a stated temperature range can be specified on the order; for North America a range of −40 to 120 °C is often asked for.

How FULI supplies UCP326

FULI supplies UCP326 as a complete unit, or the UC326 insert on its own for replacement. Before packing, the factory checks the mounting torque, the fit of the insert in the housing, the radial clearance and that the base-to-centre height is consistent across the batch.

Rings are marked with a brand you are authorised to use, with the FULI brand, or left neutral, as your order states. The box is printed with the model, precision class and brand.

Inquiries that leave out the prefix or suffix letters are the usual cause of a wrong quote, so write the full designation, for example UCP326.

Tools and guides for UCP326

• Insert bearing sizes: UC, SB and SA
• Pillow block bearing sizes
• Flange bearing sizes
• Pillow block bearing cross reference
• Bearing lubrication basics
• All bearing products and model pages