S-91327A172 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
- Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments
- Reliable vibration resistance thanks to the integrated nylon patch thread locker, maintaining secure fastening from -50° to 250° F
- High tensile strength of 70,000 psi and Rockwell B55 hardness for exceptional durability in demanding applications
- Precise Class 3A thread fit ensures accurate alignment and reduced assembly time in machinery
- Knurled socket head design provides enhanced grip for easy installation and removal with standard hex tools
- Stable shoulder diameter of 1/2" with tight tolerances for consistent pivot or bearing surface performance
- Compliance with ASME B18.3, RoHS 3, and REACH guarantees quality and environmental safety for global industrial use
Professional Applications & Engineering Value
This 3/8"-16 UNC shoulder screw is engineered to address common industrial challenges such as misalignment, vibration loosening, and corrosion. The 18-8 stainless steel construction, combined with a passivated finish, offers excellent resistance to rust and chemicals, making it suitable for precision machinery, automotive assemblies, and electronic enclosures. The nylon patch locking feature prevents unintentional loosening under dynamic loads, while the coarse UNC threads and Class 3A fit ensure quick, secure fastening. Its knurled socket head allows for easy handling in tight spaces, reducing installation errors and maintenance downtime in high-stress industrial applications.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with UNC coarse threads for reliable engagement. Dimensions include a shoulder diameter of 1/2" (tolerance: -0.004" to -0.002") and shoulder length of 5/8" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and performance consistency.
