Metric Bowman Oilless® Flanged Bearings

Part Number: WMOF 12 18 20 - 25 X 3

Bowman Oilless flanged bearings dry-running bronze flange bushings

Details

Inner Diameter	12
Outer Diameter	18
Length	20
Flange Thickness	3
Flange Diameter	25

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
Flange Thickness Tolerance	2.9	3	-
Recommended Housing Size	18	18.018	H7
Inside Diameter	12.032	12.05	-
Overall Length	19.7	19.9	-

PV Calculation

Values	Maximum
Speed rpm	397.9 rpm
Load kg	2446.5 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® flanged bearings?

Bowman Oilless® flanged bearings are high-strength bronze bearings designed for high-load, low-speed applications. The WMOF oilless flanged bushing range incorporates specially formed graphite plugs that provide solid lubrication for reliable dry-running operation.

When should I use a flanged bearing versus a plain bearing?

A flanged bearing is useful when the bearing must also accommodate axial positioning or thrust loads in addition to radial loads. A plain bearing is generally suited to applications where radial support is the primary requirement. Bowman can help determine whether a high load flanged bronze bearing or another bearing configuration is appropriate for your application.

What sizes of WMOF flanged bearings are available?

The WMOF range is available in both metric and imperial sizes. As part of the WMOF range bronze flange offering, Bowman can also manufacture non-standard dimensions through its in-house machining service.

What is the maximum load capacity of Oilless® flanged bearings?

Load capacity depends on factors including bearing dimensions, operating speed, temperature, lubrication conditions, and application requirements. Our engineers can assess your operating conditions and recommend a suitable dry running flanged bronze bushing for the required load.

Can Bowman make custom flanged bearing sizes?

Yes. Bowman’s in-house machining service can produce non-standard sizes to meet specific customer requirements. This allows us to provide customised graphite plug flange bushing solutions and maintenance free flanged bearing designs for specialised applications.

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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