S-99612A105 1/4"-28 Hex Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in harsh industrial environments
• High-strength performance with Grade 5 rating, ensuring reliable load-bearing capacity for demanding applications
• Precise thread engagement with Class 2B fit, providing smooth assembly and reduced risk of cross-threading
• Space-saving thin profile design (5/32" height), ideal for tight clearance applications without compromising strength
• Left-hand thread direction for specialized applications requiring reverse rotation security
• Fine thread spacing (28 TPI) delivers enhanced vibration resistance and superior clamping force distribution
• Regulatory compliance with RoHS 3 and REACH standards, ensuring environmental safety and global market acceptance

Professional Applications & Engineering Value

This Grade 5 zinc-plated steel hex nut with left-hand UNF fine threads addresses critical engineering challenges in rotating machinery, automotive systems, and specialized equipment where reverse-thread applications prevent accidental loosening. The thin hex profile provides significant space optimization in compact assemblies while maintaining full Grade 5 strength characteristics. The zinc plating creates a sacrificial barrier against corrosion, making these industrial fasteners suitable for outdoor equipment, marine applications, and manufacturing environments exposed to moisture and chemicals. The Class 2B thread fit ensures consistent engagement with mating components, reducing installation time and improving production efficiency.

Specification Summary & Compliance

Manufactured to UNF thread standards with Class 2B thread fit tolerance for precise dimensional accuracy. The 1/4"-28 fine thread specification provides optimal performance in vibration-prone applications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The Grade 5 strength classification ensures consistent mechanical properties meeting industrial fastener requirements. External hex drive design accommodates standard wrenching tools for straightforward installation and maintenance.