S-91375A119 4-48 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 tight, vibration-resistant connections in precision assemblies
- Enhanced corrosion resistance from the black-oxide finish, extending service life in demanding industrial environments
- High-strength durability with Rockwell C45 hardness alloy steel, resisting deformation under heavy loads
- Secure, flush mounting due to the headless design and cup tip, preventing component movement and surface damage
- Easy installation in confined spaces with the compact 0.050" hex drive, allowing precise torque application
- Reliable fine thread engagement with 4-48 UNF threading, ensuring stable fastening in thin materials
- Broad industry compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, regulated use
Professional Applications & Engineering Value
This 4-48 UNF Class 3A set screw is engineered to address critical fastening challenges in precision machinery, automotive, and electronics industries. The black-oxide alloy steel construction provides excellent resistance to rust and wear, while the Rockwell C45 hardness ensures the screw maintains its integrity under repetitive stress. The headless hex drive design allows for flush installation, ideal for applications where protruding components are not feasible. With fine thread spacing and a cup tip, it delivers maximum grip and prevents loosening from vibrations, making it perfect for securing gears, pulleys, and shafts in high-performance assemblies. Its compliance with major standards ensures reliability and safety in regulated environments.
Specification Summary & Compliance
This set screw features a 4-48 UNF thread with Class 3A fit for high precision and tight tolerances. It is manufactured from alloy steel with a black-oxide surface treatment and meets ASME B18.3 specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.
