In the world of precision engineering, traditional stainless steel ball plungers aren’t always the best fit. When working with sensitive surfaces, chemical environments, or non-conductive requirements, high-performance plastics like PEEK and POM are the industry gold standard.
At SinoBoltco, our Hex Head Plastic Ball Transfer Units are designed to meet these specialized needs. But which material should you specify for your project? Let’s break down the technical differences.
1. POM (Polyoxy-methylene) Ball Transfer Units: The Versatile Workhorse
Commonly known as Delrin, POM is a high-stiffness engineering thermoplastic.
Best for: General mechanical applications, furniture, and light industrial conveyor systems.
Key Advantage: Exceptional low friction and wear resistance. It provides smooth movement without the need for lubrication.
Temperature Limit: Stable up to 90°C (194°F).
Cost-Effective: POM offers a high performance-to-price ratio for high-volume projects.
2. PEEK (Polyether-ether-ketone) Ball Transfer Units: The Extreme Performer
PEEK is a “super plastic” used in aerospace and medical sectors where failure is not an option.
Best for: Semiconductor manufacturing, vacuum environments, and chemical processing plants.
Key Advantage: Superior Chemical Resistance. PEEK is virtually inert to most organic and inorganic chemicals.
Temperature Limit: Can withstand continuous use up to 250°C (482°F).
Non-Outgassing: Ideal for cleanroom and vacuum applications where material purity is critical.
3. Technical Specifications: M5 to M10 Range
One of the most common questions we receive is about metric sizing compatibility. Our hex head design ensures easy installation using standard tools.
| Metric Size | Thread Pitch | Hex Socket Size | Typical Application |
| M5 | 0.8 mm | 2.5 mm | Small electronics, precision jigs |
| M6 | 1.0 mm | 3.0 mm | Laboratory equipment, sensors |
| M8 | 1.25 mm | 4.0 mm | Industrial machinery, panel positioning |
| M10 | 1.5 mm | 5.0 mm | Heavy-duty modular shelving, automotive |
4. Why Switch from Steel to Plastic?
Many engineers are moving away from metal components for three primary reasons:
Non-Marring: Plastic balls will not scratch or dent delicate surfaces like polished glass, aluminum, or acrylic.
Corrosion Proof: Unlike “corrosion-resistant” steel which can still oxidize over time, PEEK and POM are 100% rust-proof.
Lightweight: Crucial for applications in drones, portable medical devices, and aerospace.
Conclusion
Choosing between POM and PEEK depends on your environment. If you need a reliable, low-friction solution for room-temperature use, POM is your best bet. If your application involves high heat or aggressive chemicals, PEEK is the necessary investment.
Looking for CAD drawings or bulk pricing for M5-M10 Plastic Ball Plungers? Visit our Product Page or contact the SinoBolt technical team today for expert advice.