Metric Bowman Oilless® Plain Bearings

Part Number: WMO 18 24 20

Bowman Oilless plain bearings dry-running bronze bushings

Details

Inner Diameter	18
Outer Diameter	24
Length	20

Material Specification

Structure	CuZn25Al6Mn4 Bronze with solid graphite lubricant inserts (alternative specifications are available on request)
PV (N/mm² x m/s)	3.3 max
Static load (N/mm²)	100 max
Sliding speed (m/s)	0.3 max
Operating temperature (°C)	Up to 300 (alternative specs up to 400)
Coefficient of thermal expansion	19 x 10^-5/°C
Coefficient of friction	0.16
Hardness (HB)	210 min
Tensile strength (N/mm²)	750 min
Elongation (%)	12 min
Density (g/cm³)	8

Tolerances & Fittings (Metric)

	Min	Max	Tolerance
Recommended Housing Size	24	24.021	H7
Inside Diameter	18.016	18.034	-
Overall Length	19.7	19.9	-

PV Calculation

Values	Maximum
Speed rpm	265.3 rpm
Load kg	3669.7 kg
PV Factor N/A N/mm² x m/s	3.3 N/mm² x m/s

⚠ Maximum PV Factor is 3.3! Reduce speed or load.

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 Bowman Oilless® plain bearings?

Bowman Oilless® plain bearings are high-strength bronze bearings designed for high-load, low-speed applications. The WMO oilless plain bushing range uses specially formed graphite plugs to provide solid lubrication, enabling reliable dry-running operation with minimal maintenance.

What is the difference between Oilless plain bearings and sintered bronze bearings?

Oilless plain bearings use graphite plugs embedded in high-strength cast bronze for solid lubrication and are particularly suited to high-load, low-speed applications. Sintered bronze bearings are typically oil-impregnated, allowing the absorbed oil to provide lubrication during operation. The appropriate choice depends on the application's load, speed, lubrication, and maintenance requirements.

What sizes of WMO plain bearings are available?

WMO plain bearings are available in a range of metric and imperial sizes from stock. As an established WMO bronze bushing manufacturer, Bowman can also produce non-standard dimensions through its in-house machining service.

What load and speed limits apply to Oilless® plain bearings?

Oilless® plain bearings are designed primarily for high load low speed bushing applications. Actual load and speed limits depend on factors such as bearing dimensions, operating temperature, surface finish, load conditions, and application environment. Bowman can assess these factors to recommend a suitable bearing.

Can Bowman make custom Oilless® plain bearing sizes?

Yes. Bowman’s in-house machining service can manufacture non-standard sizes to meet specific customer requirements. This provides flexibility for applications requiring a dry running bronze bushing, graphite lubricated bronze bearing, or maintenance free plain bearing solution.

Looking for a custom size or special specifications?

Whether you need standard or custom options, we’re here to help. Reach out now and let’s find the perfect match!

Bowman International Group

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