S-93691A130 4-40 MS51576-3, NASM51576 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
- Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments.
- High tensile strength of 70,000 psi ensures reliable performance in demanding applications without failure.
- Precise shoulder fit with tight tolerances guarantees accurate alignment and reduced assembly vibration.
- Class 2A thread fit with UNC coarse threads provides easy installation and secure fastening in various materials.
- Rockwell B55 hardness offers excellent durability and resistance to wear over extended use.
- Hex socket drive design allows for high-torque application and secure tool engagement in confined spaces.
- Compliance with MS51576-3, RoHS 3, and REACH ensures environmental safety and meets rigorous industry standards.
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. Made from 18-8 stainless steel with a passivated finish, it resists corrosion in moist or chemical-exposed settings, extending service life in machinery, electronics, and automotive components. The 1/8" shoulder diameter and 1/4" shoulder length with precise tolerances ensure minimal play, reducing wear and maintaining positional accuracy in rotating parts like gears and pulleys. Its coarse UNC threads and Class 2A fit facilitate quick installation, while the socket head design supports high-torque needs in tight spaces, making it a reliable choice for engineers seeking heavy-duty performance and compliance with global regulations.
Specification Summary & Compliance
This shoulder screw features a Class 2A thread fit with UNC coarse threads (4-40 size), ensuring standard-compliant dimensions and ease of assembly. The shoulder maintains tight tolerances (diameter: -0.001" to 0", length: 0" to 0.002") for precise fits. It conforms to MS51576-3 specifications and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, adhering to environmental and safety standards for industrial use.
