Injection Moulding Machine for Plastic Bearings
Plastic bearing cages, races and mounted bearing housings are made on horizontal injection moulding machines in grades such as POM, PA66, PA46 or PEEK. Cage size, cavity count and the number of ball pockets set mould complexity and shot weight. Heat stability matters most, so POM or PEEK cages are often chosen over unfilled nylon.
Only the polymer parts are moulded, and balls in glass, stainless steel or ceramic are assembled afterwards. Pratishna Engineers can advise on horizontal and hybrid injection moulding machines for cage and housing moulds, sized to your bearing and production plan.
Moulding Bearing Cages or Housings?
Send the cage or housing drawing, compound and output, and Pratishna Engineers will suggest a machine.
Machine Requirements for Plastic Bearing Moulding
Bearing cages carry ball pockets that must stay round and evenly spaced at running temperature. Machine points to check:
- Repeatable injection for evenly spaced ball pockets
- Snap-in pocket undercuts released with controlled ejection
- Mould temperature control for stable POM and PEEK parts
- Drying of PA66 and PA46 before moulding
- High barrel and mould temperatures for PEEK and PPS
- Housing bores held round for the bearing seat
Recommended Machine for Plastic Bearings
Cages and small races are light parts, so most of their moulds fall within the E Series (75-180 T), and the Hybrid PH (120-140 T) suits multi-cavity cage tools where electric injection helps keep pocket size steady. Mounted bearing housings and larger multi-cavity moulds move to the H Series (120-350 T).
Not Sure Which Machine You Need?
Share your cage or housing details for a machine suggestion.
Why Choose Pratishna Engineers?
- Application-Based Machine Selection
- In-House Engineering & Manufacturing
- Multiple Machine Series
- Production-Focused Solutions
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Injection Moulding Machine Buyer Resources
Download practical resources to help you select, size and specify the right machine.
Horizontal Injection Moulding Machine Selection Guide
A step-by-step guide covering the key inputs needed to select the right machine: product weight, projected area, number of cavities, plastic material, required clamping force, shot / injection capacity, mould dimensions, production quantity, cycle time and automation requirement.
Download PDFPDF · 265 KB
How to Calculate Clamping Force for an Injection Moulding Machine
A clear methodology that explains how clamping force is calculated, covering projected area, injection pressure, safety factor, number of cavities and material considerations.
Download PDFPDF · 363 KBEngineering Components & Machine Guide
A guide to Engineering components, covering gears, bushings, rollers, bearings, brackets, pneumatic fittings, sprockets and precision mechanical parts. It explains POM, nylon and filled grades, shrinkage, tolerance control, and how to match each part to a suitable machine.
Download PDFPDF · 206 KB
FAQs / Buyer Questions
Answers to the questions bearing part makers raise most.
Which Injection Moulding Machine Is Used to Make Plastic Bearings?
A horizontal or hybrid machine sized to the cage or housing mould. E Series and Hybrid PH machines cover most cage tools, while mounted housings and bigger moulds go to the H Series.Which Bearing Parts Are Moulded and Which Are Bought In?
The cage, the plastic races and the mounted housing are moulded. Balls are glass, stainless steel or ceramic and are assembled in, so the moulded pockets and race grooves only have to hold their size and spacing.Why Are POM or PEEK Often Chosen over Unfilled Nylon for Cages?
Cages must keep pocket size at running temperature. POM and PEEK stay dimensionally steady, while unfilled nylon moves more with heat and moisture. Dry-running ability comes from the compound, such as PTFE-filled grades, so check the supplier pressure-velocity and load chart first.
Does Moisture Change Nylon Bearing Dimensions?
Yes. Nylon cages and housings grow as they absorb moisture after moulding. Dry the resin before moulding, then specify and check the conditioned dimension rather than the size straight out of the mould.Can Pratishna Recommend a Machine for My Plastic Bearing?
Yes. Share the cage, race or housing drawing, compound, part weight, mould dimensions, number of cavities and yearly quantity, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Rotating Engineering Parts Too?
Yes. The same machines can mould plain bushings, rollers, gears and timing pulleys, subject to part size, compound and mould.
Technical Disclaimer
Disclaimer: The information provided in this webpage is for general informational and educational purposes only. It is based on technical references and industry information available at the time of preparation and may be subject to change. It does not constitute engineering, technical, commercial or professional advice, nor does it constitute a quotation, specification, warranty or contractual commitment by Pratishna Engineers.
Actual injection moulding machine and process requirements vary according to the component design, material, mould, production volume, machine configuration and operating conditions. The information, examples, calculations and recommendations provided should be independently evaluated and verified for the specific application before making any equipment, process or production decision. Information obtained from third-party sources remains subject to the accuracy and limitations of those sources.
Limitation of Liability: Pratishna Engineers makes no representation or warranty, express or implied, regarding the completeness, accuracy or suitability of the information for any particular application. To the extent permitted by applicable law, Pratishna Engineers shall not be liable for any loss, damage, cost or consequence arising from reliance on or use of the information contained in this webpage. Final machine selection, configuration and application suitability should be confirmed with Pratishna Engineers based on complete and accurate project requirements.
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Planning a New Injection Moulding Project?
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