Overview
The Brighton Best hex jam nut 5/8″-18 is a finished fastener designed for critical locking applications requiring dependable thread-locking performance. This nut features CR+3 zinc coating for superior corrosion and salt-spray resistance. Each box contains 29 units, sized at 5/8″-18 UNC (Unified National Coarse), conforming to ASTM A563 Grade A specifications. Ideal for machinery assembly, automotive systems, industrial equipment, and maintenance tasks where secure fastening and vibration resistance are essential.
Key Features
- CR+3 zinc coating provides corrosion and salt-spray protection
- ASTM A563 Grade A specification for consistent quality
- 5/8″-18 UNC thread standard for precision fitment
- Low carbon steel construction with finished hex geometry
- Effective jamming action when paired with full-size hex nuts
- Box of 29 nuts—convenient count for common applications
Technical Specifications
| Thread Size | 5/8″-18 UNC |
| Material | Low Carbon Steel |
| Finish | Zinc CR+3 |
| Grade | ASTM A563 Grade A |
| Type | Finished Hex Jam Nut |
| Quantity per Box | 29 |
| Package Type | Cardboard Box |
| Hex Width | 15/16″ |
| Height | 11/32″ |
Typical Applications
- Securing bolted connections against vibration loosening
- Paired fastening with full-size hex nuts in two-nut locking systems
- Machinery and equipment assembly
- Automotive and transportation systems
- Industrial maintenance and repair
- HVAC and mechanical systems
Compatibility & Replacements
Compatible With
- 5/8″-18 UNC threaded fasteners and bolts
- Standard metric conversion equipment requiring equivalent inch fasteners
- Industrial machinery with inch-based fastener specifications
- Vibration-resistant fastening systems
- Applications conforming to ASTM A563 standards
Replaces / Drop-In Replacement For
- Previous-generation Brighton Best hex jam nuts 5/8″-18
- Generic zinc CR+3 hex jam nuts meeting ASTM A563 Grade A
- Verify exact part cross-reference with technical documentation or distributor
Works With
- 5/8″-18 UNC bolts, studs, and threaded rod
- Companion full-size hex nuts in 5/8″-18 for two-nut assembly
- Standard wrenches and socket sets (15/16″ hex width)
- Torque specifications per ASTM and fastener standards
