Details
| Inner Diameter | 25 |
| Outer Diameter | 28 |
| Length | 15 |
| Backing Material | Bronze |
Material Specification
| Structure | CuSn8 backing strip with sintered bronze & PTFE layers. |
|---|---|
| Max PV – Dry (N/mm² x m/s) | 1.8 |
| Max PV – Oiled (N/mm² x m/s) | 2.8 |
| Max Static load (N/mm²) | 250 |
| Max Dynamic load (N/mm²) | 140 |
| Max Sliding speed – Dry (m/s) | 2.5 |
| Max Sliding speed – With Oil (m/s) | 5 |
| Operating temperature (°C) | -200 to 280 |
| Thermal Conductivity (W/mk) | 42 |
| Coefficient of friction – Dry | 0.02 to 0.20 |
| Coefficient of friction – With Oil | 0.02 to 0.15 |
| Recommended shaft finish (Ra) | 0.04 max (N5) |
| Recommended shaft hardness (HB) | 200 min |
Tolerances & Fittings (Metric)
| Min | Max | Tolerance | |
|---|---|---|---|
| Inside Diameter When Fitted | 24.99 | 25.071 | - |
| Recommended Housing Size | 28 | 28.021 | H7 |
| Overall Length | 14.75 | 15.25 | - |
| Shaft Diameter | 24.959 | 24.98 | - |
| Inside Chamfers | 0.1 | 0.7 | - |
| Outside Chamfers | 0.2 | 1 | - |
Frequently Asked Questions
If the answer to your question is not listed below, please feel free to give us a call directly on +44 (0)1235 462500 or email us at sales@bowman.co.uk.
What are WMUB® bronze backed plain bearings?
WMUB® bronze backed plain bearings are self-lubricating composite bearings designed for demanding applications requiring higher load capacity and long service life. They feature a solid bronze backing, a porous sintered bronze interlayer, and a low-friction PTFE sliding surface, delivering excellent wear resistance, reduced friction, and maintenance-free operation.
How does WMUB® compare to WMU® for high load applications?
While both WMU® and WMUB® bearings use a PTFE-lined sliding surface, WMUB® bearings incorporate a bronze backing instead of steel. This provides greater compressive strength, improved fatigue resistance, and enhanced structural rigidity, making WMUB® the preferred choice for high load PTFE bushings and more demanding operating conditions.
Can WMUB® plain bearings run without lubrication?
Yes. WMUB® plain bearings are specifically designed for dry-running operation. The PTFE sliding layer provides excellent low-friction performance without the need for continuous lubrication, reducing maintenance requirements while delivering reliable long-term performance.
What is the PV rating of WMUB® bronze backed bearings?
WMUB® bearings are engineered to provide excellent PV (pressure-velocity) performance for demanding industrial applications. The maximum allowable PV value depends on operating conditions such as load, speed, shaft material, temperature, and duty cycle. Bowman can provide detailed technical guidance and performance data to help select the correct bearing for your application.
Where are bronze backed plain bearings typically used?
Bronze backed plain bearings are commonly used in heavy-duty applications where high loads, corrosion resistance, and maintenance-free operation are essential. Typical industries include construction, mining, marine, agriculture, hydraulic equipment, industrial automation, material handling, pumps, compressors, and general engineering, where long service life and dependable performance are critical.
