S-9634K31 6-40 x 5/8" Hanger Bolts

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide steel coating for prolonged service life in demanding environments
• Precise thread engagement with 6-40 UNF fine threads ensuring secure, vibration-resistant connections
• Optimized for extension springs with 0.08" hole diameter compatibility and 5/8" length for reliable spring anchoring
• Right-hand thread design for standard installation and easy assembly in industrial applications
• Robust stud construction with 0.138" diameter providing superior strength and load distribution
• Full regulatory compliance meeting RoHS 3 and REACH standards for safe, environmentally responsible use
• Fine thread spacing delivering improved clamping force and reduced loosening under dynamic loads

Professional Applications & Engineering Value

These 6-40 UNF hanger bolts are engineered to address critical challenges in extension spring mounting systems where consistent tension and secure anchoring are paramount. The black-oxide steel construction provides essential corrosion protection in industrial settings, while the fine UNF threads maintain grip integrity despite vibration and cyclic loading. With precise 0.08" hole diameter compatibility, these studs eliminate spring slippage and alignment issues, making them ideal for automotive suspensions, machinery counterbalance systems, and industrial equipment where right-hand thread standardization simplifies maintenance. The combination of material durability and thread precision ensures reliable performance in high-stress applications.

Specification Summary & Compliance

Manufactured to standard UNF thread specifications with fine thread spacing and right-hand thread direction. Features include 5/8" length, 0.138" diameter, and minimum thread length of 5/8". Fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations as of 01/17/2023.