S-97768A416 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 and black oxide finish, ideal for harsh industrial environments
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Precise alignment and spacing ensured by the 1/2" shoulder diameter with tight tolerance control
- Secure installation and removal using the hex drive socket and knurled head for enhanced grip
- Reliable thread engagement with Class 3A UNC coarse threads for consistent fastening performance
- Extended service life supported by Rockwell B55 hardness and compliance with ASME B18.3 standards
- Environmentally responsible manufacturing meeting RoHS 3 and REACH regulations for global supply chain compatibility
Professional Applications & Engineering Value
This 5/16"-18 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision machinery, automation systems, and assembly fixtures. The 18-8 stainless steel construction, combined with a black oxide finish, provides excellent resistance to corrosion and wear, reducing maintenance in humid or chemically aggressive settings. The 1/2" shoulder length acts as a precise pivot or spacer, minimizing component misalignment and vibration-induced loosening. With a Class 3A thread fit and coarse UNC threads, it ensures quick assembly and reliable torque transmission, while the socket head with hex drive allows for compact installation in confined spaces. Ideal for use in robotics, conveyor systems, and motor mounts, this shoulder screw enhances operational reliability and reduces downtime in industrial fastener applications.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit and a shoulder diameter of 1/2" (tolerance: -0.004" to -0.002"). The shoulder length is 1/2" (tolerance: -0.005" to 0.005"), and the thread length is 5/8". It is manufactured in accordance with ASME B18.3 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory adherence for industrial use.
