S-90211A513 1/2"-20 x 1 1/2" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
• Precise thread engagement with Class 3A fit and UNF fine pitch for secure fastening and vibration resistance
• High-grade material construction meeting Grade 8 standards with Rockwell C33 hardness for maximum durability
• Left-hand thread design providing specialized solutions for counter-rotational applications and safety-critical assemblies
• Full threading coverage ensuring consistent grip strength along the entire 1½" length
• Industry compliance assurance with SAE J429 specifications for guaranteed quality and interoperability

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions where reverse-thread applications demand uncompromising reliability. The left-hand UNF fine thread configuration prevents loosening in counter-clockwise rotating machinery, while the external hex drive provides superior torque transmission during installation. Manufactured from high-strength steel with zinc yellow-chromate plating, it resists corrosion in industrial environments where exposure to moisture and chemicals is common. The Class 3A thread fit ensures precise mating with components, eliminating play in high-vibration applications across automotive, heavy equipment, and manufacturing sectors. With SAE J429 compliance, engineers can specify these fasteners with confidence for critical assemblies requiring documented performance standards.

Specification Summary & Compliance

This fastener maintains Class 3A thread tolerances per UNF standards with 1/2"-20 left-hand fine pitch threading and full thread coverage along its 1½" length. Manufactured to meet SAE J429 specifications for Grade 8 fasteners, it delivers consistent mechanical properties including 150,000 psi tensile strength and Rockwell C33 hardness. The zinc yellow-chromate plating provides corrosion protection while maintaining dimensional accuracy. Compliant with RoHS and REACH environmental regulations, this industrial screw ensures both performance reliability and regulatory adherence for professional applications.