S-91375A890 5/16"-18 x 3/4" ASME B18.3, ASTM F912 Set Screws
Set 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 vibration resistance with Class 3A thread fit for secure, long-term fastening in high-stress applications
- Enhanced corrosion protection through zinc plating, extending service life in demanding industrial environments
- High-strength performance from alloy steel with Rockwell C45 hardness, resisting deformation under heavy loads
- Secure torque transmission via 5/32" hex drive design, preventing tool slippage during installation
- Effective component positioning with cup tip design that bites into shafts for positive locking
- Reliable coarse threading (UNC) for quick assembly and reduced cross-threading risks in production settings
- Space-saving headless construction allowing flush mounting where clearance is limited
Professional Applications & Engineering Value
This zinc plated alloy steel set screw delivers critical engineering solutions for industrial assembly challenges. The Class 3A thread fit maintains precise tolerances in vibrating machinery, preventing loosening in power transmission systems and rotating equipment. The cup tip design creates positive engagement with shaft surfaces, making it ideal for securing collars, gears, and pulleys where positional accuracy is paramount. With Rockwell C45 hardness, this hex drive set screw withstands repeated adjustments without thread deformation, while the right-hand UNC coarse thread enables rapid installation in high-volume manufacturing environments. The corrosion-resistant zinc plating ensures consistent performance in both indoor industrial settings and moderate outdoor applications.
Specification Summary & Compliance
This 5/16"-18 UNC set screw features precise Class 3A thread fit with coarse thread spacing for optimal engagement. Manufactured to ASME B18.3 specifications and ASTM F912 standards, ensuring dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring restricted substance compliance.
