S-94622A249 1/2"-20 x 4 3/32" AN8-40 Cotter Pin-Lockable Hex Head Screws
Cotter Pin-Lockable Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
Installation & Application
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Key Features & Benefits at a Glance
- Superior corrosion resistance with cadmium-plated steel coating, extending service life in harsh industrial environments
- Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C26 hardness for heavy-duty load applications
- Precision thread engagement through Class 3A thread fit ensuring vibration resistance and reliable fastening
- Secure locking mechanism with integrated cotter pin hole preventing accidental loosening under dynamic loads
- Optimized torque transmission via external hex drive design for efficient installation with standard tools
- Fine thread spacing providing enhanced clamping force distribution and improved fatigue resistance
- Industry-standard compliance meeting AN8-40 specifications for guaranteed interchangeability and quality
Professional Applications & Engineering Value
This 1/2"-20 UNF hex head screw delivers critical performance where vibration resistance and mechanical reliability are paramount. The cadmium-plated steel construction provides essential corrosion protection for outdoor equipment, machinery, and aircraft-grade assemblies. Its Class 3A thread fit maintains precise tolerances under thermal cycling and dynamic stresses, while the cotter pin locking system eliminates rotational loosening in high-vibration environments. The partially threaded design concentrates clamping force precisely where needed, making it ideal for structural connections, pivot points, and machinery requiring secure external hex drive fastening solutions that meet rigorous AN8-40 specifications.
Specification Summary & Compliance
Manufactured to AN8-40 standards with Class 3A thread fit ensuring precision UNF fine threading. Inch system dimensions include 1/2"-20 thread size, 4 3/32" length, and 3/32" cotter pin compatibility. Material certification includes cadmium-plated steel with Rockwell C26 hardness and 120,000 psi tensile strength verification. Compliant with industry-standard dimensional and mechanical requirements for reliable performance in regulated applications.
