S-94622A217 1/4"-28 x 2 1/32" AN4-20 Cotter Pin-Lockable Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with cadmium plating for extended service life in harsh industrial environments
• Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C26 hardness for heavy-duty applications
• Precision thread engagement with Class 3A fit and UNF fine threads ensuring reliable, vibration-resistant connections
• Positive locking security through integrated 1/16" cotter pin hole for critical safety applications
• Optimized load distribution with partial threading design and 1 9/16" grip length for superior clamping force
• Industry-standard compliance meeting AN4-20 specifications for aerospace and military applications
• Easy installation and maintenance with external hex drive and standard 7/16" head width for common tool compatibility

Professional Applications & Engineering Value

This cadmium-plated steel hex head screw delivers critical performance advantages for demanding engineering applications. The combination of 120,000 psi tensile strength and Rockwell C26 hardness provides exceptional resistance to mechanical stress and fatigue, making it ideal for aircraft assemblies, heavy machinery, and structural components where failure is not an option. The Class 3A thread fit with UNF fine threading ensures precise engagement that maintains integrity under vibration, while the cotter pin locking mechanism offers positive retention for safety-critical connections. The cadmium plating provides superior corrosion protection without compromising the material's inherent strength, addressing common failure points in industrial environments where exposure to elements is a constant concern.

Specification Summary & Compliance

This 1/4"-28 UNF hex head screw features Class 3A thread fit for precision engagement and meets AN4-20 specifications for aerospace and defense applications. The fastener maintains dimensional accuracy with right-hand thread direction, fine thread spacing, and partial threading design. Critical dimensions include 2 1/32" overall length, 15/32" thread length, and 1 9/16" grip length with a 0.076" cotter pin hole diameter. Manufactured to inch system standards with external hex drive configuration, this component complies with industry mechanical property requirements including 120,000 psi tensile strength and Rockwell C26 hardness ratings.