S-91375A868 1/4"-20 x 5/8" 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 holding power with Class 3A thread fit for precise, vibration-resistant assemblies in demanding applications
- Enhanced corrosion resistance from zinc plating, extending service life in various industrial environments
- High-strength durability provided by alloy steel with Rockwell C45 hardness, resisting wear and deformation under load
- Secure, flush installation with headless hex drive design, ideal for confined spaces and smooth surface requirements
- Quick, reliable fastening using coarse UNC threads and 1/8" hex drive for efficient assembly and disassembly
- Firm component positioning with cup tip design that digs into surfaces to prevent slippage and movement
- Global compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
This 1/4"-20 UNC Class 3A set screw delivers critical engineering solutions for industrial assemblies requiring secure component fixation. Manufactured from zinc plated alloy steel, it combats corrosion in harsh operating conditions while maintaining structural integrity. The headless hex drive and cup tip design enable flush mounting and positive locking, preventing rotational slip in pulleys, gears, and collars. With coarse thread geometry and Class 3A fit, it ensures rapid installation and high vibration resistance, reducing maintenance needs in machinery, automotive, and heavy equipment applications. Its compliance with ASME B18.3 guarantees dimensional consistency for reliable performance across production runs.
Specification Summary & Compliance
This set screw features a 1/4"-20 UNC coarse thread with Class 3A tolerance for precise fit, a length of 5/8", and 1/8" hex drive. It is manufactured from alloy steel with Rockwell C45 hardness and zinc plating surface treatment. The product conforms to ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
