UC315 Bearing Dimensions
UC315 insert bearing: 75 mm bore, 160 mm spherical OD, 82 mm width, set-screw lock (FULI catalog). Fits P315/F315/FL315/T315 housings. Quote.
UC315 specifications
| Bore d | 75 mm |
|---|---|
| Outside diameter D | 160 mm |
| Inner ring width B | 82 mm |
| Outer ring width C | 42 mm |
| Seal / shield options | Sealed insert bearing (UC type), spherical outside diameter, set-screw locking |
| Material | GCr15 chrome bearing steel (rings and rolling elements) |
| Precision | P0 (standard) |
| Radial clearance | C0 (standard); C3 on request |
Dimensions from FULI's catalog.
Load ratings & speed
| Dynamic load rating Cr | 112.0 kN |
|---|---|
| Static load rating C0r | 76.8 kN |
| Weight | 4.68 kg — approx. |
Values from FULI's catalog; confirm for your application.
How to read the UC315 designation
| Segment | Meaning |
|---|---|
| UC | Insert bearing with set-screw locking and spherical outside diameter |
| 3 | 300 series (medium duty) |
| 15 | Bore code 15 → 75 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
UC315 interchange
UC315 is an ISO designation. The boundary dimensions are identical across manufacturers; only suffixes (seals, clearance, cage) differ.
Brand numbers for UCP, UCF and UCFL units: Pillow Block Bearing Cross Reference.
Brand names are trademarks of their respective owners. FULI is not affiliated with, authorized by or endorsed by these companies. Part numbers are shown for interchange reference only. FULI dimensions, load ratings and speeds come from the FULI catalog.
UC315 compared with nearby sizes and housings
UC315 is a set-screw insert for a 75 mm shaft: outside diameter 160 mm, inner ring width 82 mm and outer ring width 42 mm.
UC321 is the next larger size in the same series on this site: shaft d 105 mm (30 mm more), outside diameter D 225 mm (65 mm more) and inner ring width B 112 mm (30 mm more).
| Model | Type | Main dimensions | Weight (kg) |
|---|---|---|---|
| UC315 | insert bearing (this page) | 75 × 160 × 82 mm (d × D × B) | 4.68 |
| UC321 | insert bearing | 105 × 225 × 112 mm (d × D × B) | — |
Dimensions in mm from the model pages; weight from FULI's catalog, — = not listed on this site.
UC315 weight, load ratings and speed
FULI's catalog gives about 4.68 kg for the insert, so 100 pieces of UC315 weigh about 468 kg before packing.
The catalog lists UC315 with a dynamic load rating of 112.0 kN and a static load rating of 76.8 kN.
Values from FULI's catalog; confirm for your application.
UC315 dimensions in inches
The nearest common inch shaft size to the 75 mm bore of UC315 is 2-15/16 in (74.61 mm), 0.39 mm smaller than the bore, so UC315 would be loose on it. An inch shaft needs an inch bore insert. Inch bore versions are made for some sizes; ask us with the shaft size.
| Dimension | Millimetres | Inches |
|---|---|---|
| Bore d | 75 mm | 2.9528 in |
| Outside diameter D | 160 mm | 6.2992 in |
| Inner ring width B | 82 mm | 3.2283 in |
| Outer ring width C | 42 mm | 1.6535 in |
Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.
Mounting UC315 (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.
UC315 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.
The spherical outside diameter of UC315 lets the insert swivel in the housing seat while it is being mounted, which takes up small errors in shaft line. It does not make the bearing a self-aligning bearing in service.
Grease for UC315
The insert is sealed on both sides and greased at the factory. Fitted in a housing with a grease fitting, it can be relubricated through the housing; on its own it runs on the factory fill.
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 UC315
FULI supplies UC315 on its own as a replacement insert, or fitted in a housing as a complete unit. The rings and balls are GCr15 chrome steel and the radial clearance is C0 as standard, with C3 on request.
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 UC315.
Tools and guides for UC315
Typical applications
- Replacement inserts for UCP / UCF / UCFL housings
- Conveyors
- Agricultural machinery
FAQ
What shaft size does UC315 fit?
A 75 mm shaft (2.9528 in).
What is the difference between UC315 and UC321?
UC321 is the next size up, for a 105 mm shaft, with outside diameter D 225 mm (65 mm more) and inner ring width B 112 mm (30 mm more). Choose UC321 when the shaft is larger or the load is higher; the housings are not interchangeable.
How much does UC315 weigh?
About 4.68 kg in FULI's catalog; 100 pieces weigh about 468 kg before packing.
Can UC315 be ordered as an insert only, or as a complete unit?
Both. UC315 can be supplied on its own as a replacement insert for an existing housing, or fitted in a housing such as the UCP315 pillow block or UCF315 square flange and supplied as a complete unit. Tell us which you need when you send the inquiry.