S-99291A740 3/4"-16 Locknuts
Locknuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior vibration resistance through top-lock distorted thread design that maintains secure fastening under dynamic loads
- Exceptional corrosion protection with zinc-flake coating that provides long-lasting durability in harsh industrial environments
- Heavy-duty performance meeting ASTM Grade C standards for reliable strength in demanding applications
- Precise thread engagement with Class 2B fit and UNF fine threads ensuring consistent, secure connections
- Easy installation and removal using standard wrench tools with the external hex drive style
- Environmental compliance with RoHS 3 and REACH regulations for safe use across global markets
- Right-hand threading compatibility with standard UNF 3/4"-16 fasteners for broad application versatility
Professional Applications & Engineering Value
This 3/4"-16 UNF locknut delivers critical vibration resistance for industrial machinery, automotive assemblies, and heavy equipment where distorted thread technology prevents loosening under constant motion and shock loads. The zinc-flake-coated steel construction provides superior corrosion protection compared to standard coatings, significantly extending service life in challenging environments. With ASTM Grade C certification, this external hex locknut maintains structural integrity under high tensile loads while the fine thread spacing ensures precise engagement and uniform load distribution. The top-lock distorted thread design creates consistent friction along the mating surface, eliminating the need for additional locking components and simplifying assembly processes in manufacturing and maintenance operations.
Specification Summary & Compliance
This locknut features 3/4"-16 UNF fine threads with Class 2B thread fit for precision engagement and meets ASTM Grade C strength requirements. The external hex drive measures 1 1/8" across flats with a height of 41/64". Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and global market acceptance. The right-hand threaded, top-lock distorted thread design provides reliable vibration resistance while maintaining dimensional accuracy throughout the fastener's service life.
