Load, Speed & Environment

The life of a bearing is affected by it’s environment, the load it must carry, the speed it operates at, plus how much these vary across its service life. Plastic bearings are affected in different ways by these different conditions.

A plastic bearing can carry heavy loads, reach high speeds and is suitable for many specialist and severe environments. However, as shown in the diagram below, if an application is exposed to more than one of these factors, the potential life of the bearing can be affected.

The diagram shows the suitability of plastic bearings where load, speed and environment are all factors. Each factor is shown as a coloured circle. Where they intersect the operating conditions include more than one factor and the suitability is shown as High, Medium or Low.

BNL Diagram Edit Highspeed
High: The plastic bearing will operate efficiently and achieve a good life ---- Medium: The plastic bearing will operate efficiently but wear rates will be higher and bearing life will be affected ---- Low: This combination of factors will affect both efficiency and life of the bearing

Manufacturing for Better Performance

BNL’s unique tool design and processing technology enables us to design and manufacture bearings with moulded raceways, which outperform machined equivalent products and deliver longer life.

A fine crystalline layer is achieved in the moulding process that increases bearing life. Machined plastic bearings or those that are moulded and the raceways machined after, do not have or remove this crystalline layer and the bearing loses the benefit of improved wear rates.

Our industry standard bearings have benefited from a redesign to improve load carrying capability and benefit from our specialist manufacturing process that allows us to equip each bearing with a hardened crystalline layer, improving wear rates and life expectancy.

Superior Moulded Plastic Bearings

We use our unique moulding techniques, careful material
selection, decades of product knowledge and design expertise to manufacture bearings that outperform other plastic bearings on the market today.

We tested our moulded bearings against a popular machined bearing currently on the market.  A machined 6300 series bearing was tested under the same conditions as a BNL fully moulded 6300 series bearing.

Speed 1000 rpm - Load 20Kg - Duration 1 million revolutions
BNL's moulded bearing remained a constant temperature and DC, the machined bearing began to wear much faster, generating more heat. After 1.5 hours and 90 thousand revolutions the inner raceway of the machined plastic bearing melted and the bearing failed. BNL's bearing completed the test.
We also compared wear of moulded bearings and moulded bearings with machined tracks using mass loss. As seen in the graph above, the fully moulded BNL bearing has a much better wear rate than those manufactured using machining methods.

Torque To Rotate

Our plastic bearings are lightweight and need no grease to operate smoothly and efficiently, so have a lower torque to rotate than an equivalent steel bearing.

This means our bearings use less power at start-up and during operation, allowing our customers to choose smaller and less expensive motors for their systems and also assisting in lessening energy usage.

Our plastic 6003Z bearing has 0.15Ncm lower torque to turn than a steel 6003Z bearing

Material Choice

Our industry standard bearings come in acetal with 316 balls as standard.

Acetal is a widely used engineering plastic that is dimensionally stable when subjected to a range of loads, temperature fluctuation and fluids. It has excellent abrasion and fatigue resistance and low moisture absorption. It has a low co-efficient of friction delivering good long-term wear performance.

SS316 stainless steel balls have excellent corrosion resistance, withstanding acidic environments including sulphuric and nitric acid, photographic chemicals, bleach and solvents. They are non-magnetic.

More information on the materials used in our industry standard bearings can be found in the downloadable pdf document below.

Industry Standard Bearings Datasheet

Download our datasheet for our industry standard bearings range below.


For enquiries regarding our products or any general enquiries,
please contact us via the contact form below.

We are committed to processing your data safely and securely.

For details on how we collect, store and process your data and your rights in respect of this, please see our Privacy Notice.