S-91327A188 3/8"-16 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 locking with nylon patch thread locker maintains secure fastening in temperatures from -50° to 250° F, reducing maintenance needs in dynamic environments.
- Exceptional corrosion resistance from 18-8 stainless steel and passivated finish ensures long-term reliability in harsh industrial conditions.
- Precise alignment and load bearing with a 1/2" shoulder diameter and Class 3A thread fit for accurate component positioning and reduced wear.
- High tensile strength of 70,000 psi provides reliable performance under heavy loads, minimizing risk of fastener failure.
- Easy installation and removal with a knurled hex socket head offering superior grip and torque application without stripping.
- Standardized dimensions per ASME B18.3 ensure compatibility and interchangeability in machinery and equipment assemblies.
- Environmental compliance with RoHS 3 and REACH regulations supports sustainable and safe manufacturing practices.
Professional Applications & Engineering Value
This 3/8"-16 UNC shoulder screw is engineered to address critical alignment and vibration challenges in industrial machinery. The 18-8 stainless steel construction, combined with a passivated finish, resists corrosion and extends service life in demanding environments like automotive assemblies, conveyor systems, and precision tooling. The 1/2" shoulder diameter and Class 3A thread fit provide exact positioning for rotating parts, reducing misalignment and wear. Integrated nylon patch thread locking technology secures the fastener against loosening from vibrations, ensuring operational safety and reducing downtime. Ideal for applications requiring high-strength and reliable fastening, such as in robotics, aerospace components, and heavy equipment, this screw delivers consistent performance where precision and durability are paramount.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 standards, with a Class 3A thread fit for precise UNC threading and tolerances including shoulder diameter of -0.004" to -0.002" and shoulder length of -0.005" to 0.005". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability for industrial use.
