S-91839A317 1/2"-13 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through Flex-Top locking technology that maintains secure fastening under dynamic loads
• Exceptional corrosion protection with Black-Oxide coated 18-8 Stainless Steel construction for harsh environments
• Reliable coarse thread engagement with UNC 1/2"-13 threading for quick installation and reduced cross-threading risk
• Precision thread fit meeting Class 2B standards ensuring consistent performance and easy assembly
• Industry-standard compatibility with 3/4" hex drive for standard tooling and simplified maintenance
• Environmental compliance assurance with RoHS 3 and REACH certification for global industrial applications
• Optimized height profile at 39/64" providing balanced strength-to-weight ratio in confined spaces

Professional Applications & Engineering Value

This Black-Oxide 18-8 Stainless Steel Flex-Top locknut delivers critical vibration resistance in demanding industrial environments where loosening under dynamic loads compromises safety and operational integrity. The UNC coarse thread design enables rapid installation in high-volume assembly operations while the Flex-Top locking mechanism creates consistent prevailing torque that outperforms standard nuts in machinery, transportation equipment, and structural applications. The corrosion-resistant properties of 18-8 stainless steel combined with black-oxide surface treatment provide durable protection against moisture, chemicals, and atmospheric exposure, extending service life in outdoor and marine applications. The external hex drive configuration ensures compatibility with standard wrenching tools, facilitating maintenance and reducing downtime in industrial maintenance scenarios.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2B thread fit tolerance for reliable engagement with mating components. The 1/2"-13 UNC coarse thread follows standardized threading specifications while the 3/4" hex width and 39/64" height maintain industry-standard proportions. This locknut complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets without hazardous substance restrictions.