S-99291A520 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 with distorted thread top lock design to prevent loosening in high-stress environments
- Exceptional durability from black-oxide steel construction providing corrosion resistance and long service life
- High-strength performance meeting ASTM Grade C specifications for demanding industrial applications
- Precise thread engagement with Class 2B fit and UNF fine threads ensuring reliable, secure fastening
- Easy installation and removal using standard external hex drive for efficient maintenance operations
- Environmental compliance with RoHS 3 and REACH regulations for safe use across global markets
- Optimal size compatibility with 3/4"-16 thread and 1 1/8" width fitting standard industrial components
Professional Applications & Engineering Value
This 3/4"-16 UNF locknut delivers critical vibration resistance for heavy machinery, automotive assemblies, and industrial equipment where constant motion threatens fastener integrity. The distorted thread top lock mechanism creates intentional interference that maintains clamp load without requiring additional locking elements, simplifying assembly while reducing maintenance costs. Manufactured from black-oxide steel with ASTM Grade C strength rating, this external hex locknut withstands extreme torque and environmental exposure. The UNF fine thread configuration provides superior load distribution compared to coarse threads, making it ideal for precision applications requiring vibration resistant performance in manufacturing, construction, and transportation sectors.
Specification Summary & Compliance
This locknut features 3/4"-16 UNF fine threads with Class 2B thread fit for precise engagement, manufactured to ASTM Grade C strength requirements. The distorted thread top lock design ensures reliable performance under vibration. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, with dimensions of 1 1/8" width and 41/64" height for standard industrial applications.
