S-91327A299 8-32 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
- Superior corrosion resistance with 18-8 stainless steel and passivated finish for long-lasting performance in harsh environments.
- High-strength construction delivers 70,000 psi tensile strength and Rockwell B55 hardness for reliable, heavy-duty fastening.
- Secure vibration resistance via a nylon patch thread locker that maintains integrity from -50° to 250° F.
- Precise alignment and spacing ensured by the 3/16" shoulder diameter and 1" shoulder length with tight tolerances.
- Easy installation and removal with a standard hex socket head drive for efficient assembly in confined spaces.
- Consistent thread engagement thanks to UNC coarse threads and Class 3A fit for reduced cross-threading risks.
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use.
Professional Applications & Engineering Value
This 8-32 UNC shoulder screw is engineered to address critical industrial challenges such as misalignment, vibration loosening, and corrosion. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to rust and chemicals, making it ideal for machinery, automotive, and electronics assemblies. The integrated nylon patch thread locker secures fasteners under dynamic loads, preventing back-off in high-vibration environments like motors and conveyor systems. With a Class 3A thread fit and precise shoulder dimensions, it ensures accurate component positioning, reducing wear and maintenance costs in precision engineering applications.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with UNC coarse threads, a shoulder diameter of 3/16" (tolerance: -0.004" to -0.002"), and shoulder length of 1" (tolerance: -0.005" to 0.005"). It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and reliability for industrial use.
