S-91327A286 4-40 ASME B18.3 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Vibration-resistant performance with permanent nylon patch locking, ensuring secure fastening in dynamic applications.
- Exceptional corrosion resistance from 18-8 Stainless Steel and passivated finish, ideal for harsh industrial environments.
- High-strength durability with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing capacity.
- Precise thread engagement through Class 3A UNC coarse threads, offering superior fit and reduced assembly time.
- Wide temperature tolerance from -50° to 250°F, maintaining locking integrity in extreme conditions.
- Easy installation and removal with hex socket drive and smooth head texture, minimizing tool slippage.
- Accurate shoulder positioning with 1/8" diameter and 1" length, providing stable alignment for components.
Professional Applications & Engineering Value
This 4-40 UNC thread shoulder screw is engineered to address common industrial challenges like vibration-induced loosening and misalignment. The nylon patch locking mechanism creates a permanent bond that withstands continuous motion, making it ideal for machinery, automotive assemblies, and precision instruments. Made from 18-8 Stainless Steel with a passivated finish, it resists corrosion and extends service life in humid or chemical-exposed settings. The Class 3A thread fit ensures tight tolerances, reducing the risk of thread stripping and enhancing assembly reliability. Its 1" shoulder length and 1/8" shoulder diameter provide exact spacing and rotational stability, crucial for aligning gears, bearings, or electronic enclosures in B2B applications.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with UNC coarse threads for precise engagement, and shoulders manufactured to tight tolerances (e.g., diameter: -0.004" to -0.002"). It complies with ASME B18.3 standards for dimensional accuracy and is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations in industrial use.
