S-91318A715 5/8"-18 x 5/16" 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 corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments
- Exceptional thread precision with Class 3A fit for secure, vibration-resistant fastening in critical assemblies
- High torque transmission via 5/16" hex drive, enabling easy installation and removal without slippage
- Optimized fine thread spacing (18 TPI) for enhanced grip strength and reduced loosening under dynamic loads
- Reliable mechanical durability backed by Rockwell B80 hardness, maintaining integrity under repeated stress
- Space-saving headless design allowing flush mounting in confined or rotating machinery components
- Global compliance assurance with RoHS 3 and REACH standards, ensuring safe use in regulated industries
Professional Applications & Engineering Value
This 5/8"-18 UNF Class 3A set screw delivers critical performance in precision engineering applications where vibration resistance and corrosion protection are paramount. Manufactured from 18-8 Stainless Steel, it withstands exposure to moisture, chemicals, and temperature variations, making it suitable for automotive assemblies, conveyor systems, and marine equipment. The fine thread spacing and right-hand thread direction ensure tight clamping force on shafts, gears, and pulleys, preventing axial movement without damaging components. Combined with the hex drive and headless profile, it enables secure installation in tight spaces while maintaining a clean, unobstructed surface—ideal for rotating parts or safety-critical machinery.
Specification Summary & Compliance
This set screw adheres to UNF thread standards with a Class 3A thread fit for high precision and minimal tolerance. Key dimensions include a 0.625" thread diameter, 5/16" length, and 5/16" hex drive size in the inch system. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally sensitive and industrial safety-focused applications.
