Overview
Bakelite machine screws are engineered fasteners made from phenolic resin, a thermosetting plastic renowned for its electrical insulation and thermal stability. Developed in the early 20th century, Bakelite remains a preferred material for screws used in electrical and industrial equipment where metal fasteners pose conductivity risks. These screws are commonly threaded to standard metric or imperial specifications, ensuring compatibility with nuts and tapped holes. Their non-metallic composition eliminates corrosion concerns, making them ideal for humid or chemically aggressive environments.
Structure and Working Principle
Bakelite screws feature a threaded shaft and slotted or Phillips head, similar to metal counterparts, but leverage the material’s moldability for precise tolerances. The threads are cut or molded to match ISO or ANSI standards, ensuring secure fastening without galvanic reactions. Phenolic resin’s cross-linked polymer structure provides rigidity and dimensional stability under temperatures up to 150°C (302°F). Unlike thermoplastics, Bakelite does not soften when heated, preventing thread deformation during use.
Key Features
Electrical insulation is the primary advantage, with dielectric strength exceeding 10 kV/mm. Bakelite screws also resist flames, acids, and solvents, outperforming many engineering plastics. Lightweight yet durable, they reduce assembly weight without sacrificing performance. Colors typically range from brown to black, with some variants dyed for identification. Surface finishes are smooth to minimize friction during installation.
Application Areas
These screws are widely used in electrical panels, circuit breakers, and transformer housings to isolate live components. Automotive applications include securing wiring harnesses and insulating battery terminals. Industrial machinery employs them for non-conductive panels and fixtures. Consumer electronics manufacturers use Bakelite screws in appliances where safety standards prohibit conductive fasteners.
Maintenance and Precautions
Bakelite screws require minimal maintenance but should be inspected for cracks or wear in high-vibration settings. Avoid overtightening, as phenolic resin is brittle compared to metal. Use torque drivers calibrated to manufacturer specifications. Storage should prioritize dry conditions to prevent moisture absorption, though Bakelite’s low water uptake (<1%) makes it less sensitive than other plastics. Clean with alcohol or mild detergents; avoid abrasive cleaners.
B2B Procurement Guide
Bulk purchases typically offer cost savings, with MOQs starting at 1,000 units. Custom threads or head designs may incur tooling fees. Lead times for standard sizes are 2–4 weeks. Verify certifications like UL 94V-0 for flame resistance or RoHS compliance for electronics. Suppliers often provide material datasheets with thermal expansion coefficients and load-bearing capacities. Sample testing is recommended for critical applications.
Related Manufacturers
- 主营：各种精密螺杆料管、双螺杆挤出机、双螺杆塑料造粒机、二手双螺杆造粒机、单螺杆造粒机、单螺杆挤出机、塑料切粒机
- 主营：螺杆料筒、注塑机螺杆、注塑机机筒螺杆
- 主营：机筒内、挤出机、海雄机、pvd螺杆、150螺杆、螺杆pvc、pet螺杆、机机筒、abs螺杆、双螺杆、机螺杆、120螺杆、做abs料、刚塑机、注塑机、分胶头、机炮筒、硬机筒、齿廓线、克塑机、熔胶筒、立式机、机筒分、成型机、pvc机筒
- 主营：耐磨螺杆、注塑机螺杆、合金螺杆、造粒机螺杆、吹膜机螺杆、pe管材高速螺杆、pp拉丝机螺杆、双合金螺杆料筒
- 主营：塑料机械配件
- 主营：模温机、油温机、水温机、螺杆式冷水机、冷热一体机、冷水机组、压铸模温机、注塑模温机、电加热导热油炉、高温模温机、油式模温机、水式模温机
- 主营：120t40pvc、机料筒、软质pvc、pvd螺杆、150螺杆、pet螺杆、pvc螺杆、筒螺杆、lcp螺杆、pbe螺杆、机机筒、abs螺杆、双螺杆、螺杆料、断螺杆、机螺杆、单螺杆、料管组、挤出机、全硬机、刚塑机、多塑机、注塑机、造粒机、海明机