S-97768A406 5/16"-18 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, ideal for harsh industrial environments.
- Enhanced durability and wear resistance provided by the black oxide finish, extending service life.
- Precise component alignment ensured by the 1/2" shoulder diameter with tight tolerance control.
- High-strength fastening with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications.
- Secure, non-slip installation thanks to the knurled head and standard hex socket drive.
- Reliable thread engagement with Class 3A fit and coarse UNC threads for quick assembly and vibration resistance.
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH for global supply chain compatibility.
Professional Applications & Engineering Value
This shoulder screw is engineered to solve critical alignment and pivot point challenges in precision machinery. The 18-8 stainless steel material offers excellent resistance to corrosion and oxidation, making it suitable for applications exposed to moisture or chemicals. The black oxide finish not only enhances its aesthetic appeal but also provides an additional layer of protection against wear. The 1/2" shoulder diameter and 1/4" shoulder length ensure precise location of moving parts, reducing misalignment and wear in assemblies like rotating shafts, linkages, and jigs. The 5/16"-18 UNC coarse threads with a Class 3A fit allow for quick installation and high clamping force, minimizing the risk of loosening under vibration. Its hex drive and knurled head facilitate easy handling and secure torque application, improving assembly efficiency in automated or manual settings.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit for high precision and UNC coarse threads (5/16"-18) per standard specifications. The shoulder diameter is 1/2" with a tolerance of -0.004" to -0.002", and the shoulder length is 1/4" with a tolerance of -0.005" to 0.005", ensuring consistent performance. It is manufactured in compliance with ASME B18.3 standards and adheres to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and industrial applications.
