Seamless Screw

The seamless screw is an essential component within Variable Valve Timing systems, designed to secure the VVT phaser to the camshaft with exacting accuracy. By maintaining the precise connection that dictates valve opening and closing events, this VVT screw directly influences engine fuel economy, power output, and emission control. It is compatible with mainstream VVT, VVTi, and VTEC technologies found in vehicles from Toyota, Honda, Volkswagen, and other leading brands, as well as in advanced motorcycle valve systems. Utilizing a high-quality seamless screw is fundamental to enhancing engine adaptability across various operating conditions.

Manufactured to meet ISO 898-1 Grade 12.9 and SAE J429 Grade 12 specifications, each VVT screw is made from SCM435 alloy structural steel. Precision heat treatment processes like carburizing, quenching, and low-temperature tempering ensure a stable hardness of 12.9 grade, with a tensile strength ≥1220 MPa and yield strength ≥1080 MPa. A zinc-nickel alloy plating (10-15μm) provides excellent resistance to high-temperature oxidation (up to 200°C) and corrosion, passing salt spray tests exceeding 720 hours. This makes the seamless screw exceptionally reliable in the high-frequency, variable-temperature environment of VVT systems.

Available in thread sizes from M5 to M10 and lengths from 8mm to 35mm, our VVT screw features 6g thread accuracy and is typically supplied with a tamper-resistant internal hex (Torx) head to prevent stripping and torque loss during installation. Produced via cold heading and precision thread rolling, dimensional tolerances are held within ±0.02mm, with a tightening torque consistency error of ≤3% for compatibility with automated assembly lines. We offer customization of head style, thread length, and surface finish based on client drawings to meet specific VVT system requirements.

We support automotive parts manufacturers and large-scale service chains with a production capacity of over 800,000 units monthly, ensuring rapid order response and bulk delivery. Certified under IATF 16949, every batch of VVT screws is accompanied by complete heat treatment reports, mechanical performance tests, and salt spray test certificates for full quality traceability. We deliver consistent precision and competitive wholesale pricing, providing a one-stop fastening solution for VVT systems to enhance our clients' product competitiveness.