Nylon Plastic Screw Sizes and Application Fields
nylon plastic screw Sizes and Application Fields
plastic screws bring insulation, light weight, no rust and low cost to non-structural joints in electronics, appliances, lighting and new-energy equipment. Unlike metal, they never rust, do not conduct and create no electromagnetic interference—irreplaceable in specific applications. nylon (pa66) is the workhorse, joined by PC, PP and peek engineering plastics for different temperature and strength needs.
Choosing plastic screws weighs service temperature, load, assembly method and appearance across material and size, explained below by size, material, head, electrical use and customization.
Common Size Range
Common sizes include M2, M2.5, M3, M4, M5, M6 and imperial #4-40, #6-32, #8-32, with lengths from 4mm to 100mm. Self-tapping and machine threads are available with pan, countersunk, truss and hex heads for different assembly styles.
Unlike metal, plastic screw threads suit plastic boss design, preserving internal holes. Plastic screws take less torque than metal, so assembly torque follows material characteristics to avoid stripping and fracture.
For frequent disassembly, choose enough thread engagement and stay within recommended torque to keep clamping force after repeated cycles.
Material Comparison
pa66 nylon offers the best value—good strength, oil and alkali resistance, continuous use around 80-100°C for electronics and appliances. Glass-reinforced PA66+GF30 adds stiffness and creep resistance for higher clamping needs.
PC gives clarity and dimensional stability for visible or transparent assemblies; PP resists chemicals at low density for chemical and light-weight uses; PPS and peek handle high temperatures—PPS about 200°C long-term, PEEK better but costlier.
Flame retardance matters: UL94 V-0 ratings are achievable in nylon and PC formulations—confirm with the supplier.
Head Styles and Matching
Pan heads suit general panels; countersunk for flush surfaces; truss/washer heads spread load on thin plastics to prevent cracking; hex heads for wrench installation where space allows.
Phillips recess is standard; socket and hex external heads are options. Choose by tooling, torque and appearance, matching bit and recess to avoid slipping.
Insulation and Electrical Use
Plastic screws do not conduct, isolating live parts from housings to avoid shorts—common inside power boards, controllers and luminaires. They also create no galvanic corrosion with dissimilar metals, outperforming plain carbon steel in humid and coastal environments.
Note that plastic screws cannot take high torque; control torque to avoid stripping and follow maker recommendations for critical joints. Hot spots need higher-temperature materials to prevent loosening from deformation.
Customization and Support
Drawing-based customization covers length, head, thread and material, with colors (natural, black, transparent) for identification or appearance. Small samples and fast prototyping serve validation, with stable batches in mass production.
Mass supply includes material certificates and dimensional reports, plus assembly torque advice. Contact us for selection or samples.