S-97768A490 1/2"-13 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 from the black oxide finish, reducing maintenance frequency
- Precise component alignment ensured by the 2" shoulder length with tight tolerances for stable assemblies
- High-strength performance delivering 70,000 psi tensile and 35,000 psi shear strength for demanding applications
- Secure installation and removal with the 5/16" hex drive and knurled head for superior tool grip
- Reliable thread engagement through Class 3A thread fit, minimizing loosening under vibration
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical challenges in industrial machinery, automation, and precision equipment. The 18-8 stainless steel material provides excellent corrosion resistance, while the black oxide finish enhances surface durability and reduces galling. The 2" shoulder length with controlled tolerances ensures accurate component positioning, preventing misalignment in rotating assemblies or bearing mounts. With a 1/2"-13 UNC coarse thread and Class 3A fit, it offers secure fastening in high-vibration environments, reducing the risk of joint failure. Ideal for applications requiring robust shoulder mounting solutions, such as conveyor systems, robotic arms, and heavy-duty fixtures, this fastener delivers long-term reliability and performance.
Specification Summary & Compliance
The screw features a Class 3A thread fit for precise engagement, manufactured to ASME B18.3 specifications. Dimensions include a shoulder diameter of 5/8" with a tolerance of -0.004" to -0.002" and shoulder length of 2" with a tolerance of -0.005" to 0.005". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
