China Nylon Screw Factory & Exporters

Because nylon possesses a lower modulus of elasticity than carbon steel or brass, torque values must be adjusted to prevent shank necking or thread shear. For standard unfilled PA66 metric machine screws: M3 screws typically handle 0.15–0.20 N·m; M4 handles 0.35–0.45 N·m; M6 handles 1.20–1.50 N·m; and M8 screws support up to 2.80–3.20 N·m. For high-torque applications, specifying our 30% glass-fiber reinforced PA66-GF30 increases maximum tightening torque thresholds by approximately 80% to 110%.

Polyamides naturally absorb ambient atmospheric water through hydrogen bonding with the amide linkages. Unfilled PA6 and PA66 exhibit dimensional swelling of approximately 0.2% to 0.3% per 1% increase in absorbed water content. To mitigate field variation, SHUNDA conditions fasteners to equilibrium room humidity before shipping. For underwater or saturated applications where zero volumetric change is permissible, we advise selecting our POM (polyacetal) or PTFE machined screws, which absorb virtually zero moisture (<0.2%).

Yes. While natural translucent off-white and jet black are standard production colors, we masterbatch custom colors according to RAL or Pantone codes. For outdoor solar mounting or marine deck hardware, we incorporate hindered amine light stabilizers (HALS) and 2.5% premium furnace carbon black to prevent photo-oxidative embrittlement under continuous ultraviolet exposure, extending outdoor operational lifespans beyond 10–15 years.

Standard metric sizes (M2 to M16 DIN 933, DIN 7985, DIN 912) in natural PA66 are stocked in millions of units, enabling dispatch within 3–5 business days. Custom molded geometries or proprietary thread pitches typically require 15–20 days for tooling development and pilot testing, followed by mass production. MOQs for standard inventory screws start at 5,000–10,000 pcs, while custom machined or cast MC nylon components have no strict minimum order limitations.

Nylon exhibits superior inherent mechanical dampening and visco-elastic characteristics compared to steel. Under cyclic vibration (such as automotive pumps, compressors, or vibrating screens), nylon fastener threads deform elastically to fill mating clearance gaps, acting as a natural thread locker. They are far less prone to back-out vibration loosening than non-locking metal bolts, frequently eliminating the requirement for spring lock washers or thread-locking fluid.