Key principles.
Cheap
Threads molded directly. Cheap. Limited cycles.
Standard
Screw cuts thread in pre-drilled hole. Limited cycles.
Heavy duty
Brass insert pressed in, heated to fuse. 1000+ cycles.
Production
Ultrasonic vibration installs insert. Fast for production.
Plastic-friendly
Coarser pitches (vs metal threads) — less stripping risk.
Stronger
M5+ for plastic. Smaller threads strip easily.
FAQ
Self-tapping: handle higher loads, more cycles. Molded threads: cheaper, limited cycles. Choose per use.
Standard for quality plastic assembly. Strong, repeatable, 1000+ disassembly cycles.
Coarser pitches preferred — less stripping, easier engagement. Per ASME standards.
Boss diameter ≥ 2× thread diameter. Boss thickness ≥ 0.6× wall.
Heat-set ~2000 N. Self-tapping ~1500 N. Material/depth dependent.
Repeated assembly, hot environment, structural load. Otherwise molded threads sufficient.
Get an instant quote
Send your CAD — we reply with detailed pricing, lead time, and DFM feedback within 4 working hours.
Talk to an engineer
WhatsApp our team directly. Most messages answered within 12 minutes during work hours.
Explore all services
CNC, 3D printing, injection molding, sheet metal, casting, finishing — one quality system, one partner.
Working on a live project? Send the STEP file and the two or three features you are unsure about — an engineer replies with DFM notes and a price, usually within four working hours.