S-97768A457 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 construction and black oxide finish, ideal for harsh industrial environments.
- Precise component alignment and reduced wear due to the 1/2" shoulder diameter with tight tolerance (-0.004" to -0.002").
- Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for demanding applications.
- Secure and non-slip installation provided by the knurled socket head and 1/4" hex drive.
- Reliable thread engagement ensured by the Class 3A thread fit and coarse UNC thread for quick assembly.
- Long-lasting durability supported by Rockwell B55 hardness and compliance with ASME B18.3 standards.
- Safe for regulated industries as it is RoHS 3 and REACH compliant, meeting environmental and safety directives.
Professional Applications & Engineering Value
This 3/8"-16 UNC shoulder screw is engineered to solve critical alignment and rotational issues in precision machinery, such as in automated assembly systems, robotic arms, and fixturing applications. The 1/2" shoulder diameter with its tight tolerance ensures minimal play, reducing vibration and component wear, while the 4 1/2" shoulder length provides ample support for moving parts. Made from 18-8 stainless steel with a black oxide finish, it offers excellent corrosion resistance, extending service life in humid or chemically aggressive settings. The knurled socket head and hex drive allow for secure, high-torque installation, preventing slippage during maintenance or high-stress operations. This fastener is ideal for industries requiring heavy-duty performance and reliable, repeatable positioning.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit for precise thread engagement and features a coarse UNC thread (3/8"-16) for efficient assembly. The shoulder diameter tolerance is -0.004" to -0.002", and the shoulder length tolerance is -0.005" to 0.005", ensuring high dimensional accuracy. Manufactured in compliance with ASME B18.3 standards, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial use without hazardous substances.
