S-91327A168 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 ensures reliable fastening in high-stress environments from -50° to 250°F.
- Exceptional corrosion resistance from 18-8 stainless steel and passivated finish, ideal for harsh industrial or outdoor applications.
- Precise shoulder positioning with standard shoulder fit and tight tolerances for accurate alignment in machinery and assemblies.
- High tensile strength of 70,000 psi and Rockwell B55 hardness provide durability under heavy loads and repeated use.
- Secure installation and removal with knurled socket head and 1/4" hex drive, reducing tool slippage and improving torque application.
- Class 3A thread fit offers superior thread engagement and consistency for leak-proof and secure connections.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH ensures safety, quality, and environmental responsibility.
Professional Applications & Engineering Value
This 3/8"-16 UNC shoulder screw is engineered to address common industrial challenges such as component misalignment, vibration-induced loosening, and corrosion in demanding environments. The 18-8 stainless steel construction, combined with a passivated finish, provides excellent resistance to rust and chemicals, making it suitable for automotive assemblies, industrial machinery, and precision equipment. The integrated nylon patch thread locker maintains clamping force under thermal cycling and dynamic loads, reducing maintenance needs and downtime. With a knurled socket head and precise shoulder diameter, it ensures easy installation and accurate positioning, enhancing the reliability of rotating parts and structural joints in B2B applications.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with UNC coarse threads, ensuring high precision and interchangeability. Dimensions include a thread size of 3/8"-16, shoulder diameter of 1/2" with tight tolerance, and thread length of 5/8". It complies with ASME B18.3 specifications for dimensional accuracy and is certified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety standards for global industrial use.
