Direct factory supply of high-integrity thread-forming and engineered fastening systems for industrial applications.
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Request SpecificationOvercoming hoop stress, relaxation, and micro-cracking across engineering thermoplastics through 30° thread profiles.
Standard sheet metal screws feature wide 60° thread profiles that induce severe radial expansion stress in plastic bosses, leading to catastrophic boss burst. Our specialized PT-thread screws utilize a 30° profile that minimizes radial displacement while optimizing axial clamping force.
By engineering a smaller core diameter coupled with an expanded thread pitch, maximum polymeric volume flows into the thread valleys during installation. This plastic deformation flow increases shear area by over 45% compared to standard machine threads.
Polymeric assemblies naturally suffer from creep and stress relaxation under mechanical load and elevated temperatures. Our fasteners are engineered to distribute pre-load evenly along the engagement length, mitigating clamp loss over long-term thermal cycling.
Combining world-class production clusters with end-to-end metallurgical control from wire rod to automated sorting.
Production hubs in Dongguan, Shaoguan, and Wuhan ensure scalable output with modern multi-station cold-heading and high-speed thread-rolling equipment.
High-speed laser and vision sorting systems verify head concentricity, shank straightness, drive depth, and thread continuity down to zero-defect ppm requirements.
Fully compliant with ISO 9001, ISO 14001, and IATF 16949 quality regimes, guaranteeing documented lot traceability and PPAP Level 3 readiness for Tier-1 OEMs.
Complete export documentation, customs clearance logistics, and multi-currency billing directly serving assembly lines across North America, Europe, and Southeast Asia.
Engineered thread profiles matched precisely to specific amorphous, semi-crystalline, and filled resin matrixes.
| Polymer Category | Common Resin Types | Recommended Fastener Design | Assembly Mode / Hole Sizing | Key Mechanical Advantage |
|---|---|---|---|---|
| Ductile Thermoplastics | ABS, PP, PE, High-Impact Polystyrene (HIPS) | PT-Style 30° Flank Thread, Pan/Truss Head | Hole Diam: 0.78 - 0.82 × Nom. Thread Diam. | Low installation torque; exceptional strip-to-drive torque ratios. |
| Brittle / Engineering Plastics | Polycarbonate (PC), PMMA, PPO, Polysulfone | Blunt-tip 30° Thread with generous root radius | Hole Diam: 0.85 - 0.88 × Nom. Thread Diam. | Mitigates internal hoop stress, preventing micro-crazing and stress crack corrosion. |
| Glass-Reinforced Polymers | PA66-GF30, PBT-GF20, PPS 40% Glass | Carburized Alloy Steel / Martensitic Stainless | Hole Diam: 0.84 - 0.86 × Nom. Thread Diam. | High surface hardness prevents premature thread galling against abrasive fibers. |
| Harsh Environment Modules | New Energy Battery Boxes, Inverter Casings | PT Thread with Under-Head EPDM/Silicone O-Ring | Counterbored sealing gland boss | Achieves IP67/IP68 ingress protection while fastening plastic lids directly. |
Strict adhesion to international substance bans and comprehensive metallurgical testing parameters.
Every plating bath, passivation layer, and base alloy undergoes rigorous XRF and wet chemical testing ensuring lead (Pb), cadmium (Cd), mercury (Hg), hexavalent chromium (Cr6+), and phthalates remain strictly below mandated limits.
Certified neutral salt spray testing (ASTM B117 / ISO 9227) ranging from 96 hours for standard trivalent blue zinc up to 1,500+ hours without red rust for multi-layer zinc-nickel and organic geomet/dacromet finishes.
Full support for Automotive Production Part Approval Process including Process Flow Diagrams (PFD), Failure Mode and Effects Analysis (FMEA), Control Plans, Material Test Reports, and Dimensional Layout Reports.
How the fastener industry is evolving to meet lightweighting, EV battery demands, and automated robotic insertion.
The aggressive transition from metal subframes to structural thermoplastic housings (such as polyphthalamide and glass-filled PA) demands specialized fasteners capable of replacing metal threaded inserts, significantly reducing assembly weight and cycle times.
Modern fast-cycling automated assembly requires strict fastener tolerances. Zero-camout drive interfaces such as Torx Plus and deep Phillips recesses eliminate bit wear and magnetic feed jamming in robotic pick-and-drive arms.
Designs increasingly involve sandwich joints where thin sheet metal, silicone gasketing, and thermoplastic substrates are unified via a single screw. Pre-assembled SEMS washers and engineered under-head serrations ensure predictable pre-load retention.
In-depth engineering answers addressing boss design, strip torque, plating specifications, and OEM logistics.
The pilot hole diameter typically ranges between 78% and 88% of the screw's nominal outside diameter. For ductile plastics like polypropylene and ABS, a smaller hole (approx. 0.80 × d) provides maximum thread engagement without stripping. For brittle or fiber-reinforced plastics like PC or GF-PA66, a larger hole (approx. 0.85 to 0.88 × d) prevents dangerous hoop stress and boss cracking.
A reliable automated fastening assembly requires a strip-to-drive torque ratio of at least 3:1. Our 30° PT thread profile delivers ratios exceeding 4:1 to 5:1 across most thermoplastics, providing an expansive process window that eliminates operator error and stripped threads during high-speed power driving.
Yes. Because the 30° flank angle displaces and compresses resin rather than cutting chips away, a permanent matching female thread is formed in the plastic boss. When re-inserting, rotating the screw counterclockwise until it clicks into the original thread entry allows repeated re-engagement without stripping.
When assembling plastic housings against aluminum or dissimilar steel chassis, we recommend trivalent zinc plating with high-durability nano-sealers, black zinc nickel, or fluoropolymer coatings to insulate against electrochemical potential differences and eliminate galvanic degradation.
Specialty cold-headed fasteners, sealing assemblies, and precision thread-forming screws.
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