S-91375A116 4-48 x 1/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A thread fit for precise, vibration-resistant fastening in demanding applications.
• Enhanced durability and corrosion resistance from the Black-Oxide finish on Alloy Steel, extending service life.
• High-strength performance backed by Rockwell C45 hardness, resisting wear and deformation under load.
• Secure, non-slip installation with the hex drive (0.050") and headless design, ideal for confined spaces.
• Reliable grip and minimal surface damage due to the cup tip and fine UNF thread spacing.
• Broad industrial compatibility meeting ASME B18.3 specifications for consistent quality and interchangeability.
• Environmental and safety compliance with RoHS 3 and REACH standards, ensuring safe use in regulated industries.

Professional Applications & Engineering Value

This 4-48 UNF set screw is engineered to solve critical fastening challenges in precision assemblies, such as securing collars, gears, and pulleys on shafts. The Black-Oxide Alloy Steel construction provides excellent resistance to rust and wear, while the Class 3A thread fit and fine thread spacing ensure tight tolerances and reduced loosening under vibration. The headless design with hex drive allows for flush mounting in space-constrained applications, and the cup tip offers concentrated clamping force without damaging components. Ideal for machinery, automotive, and electronics, this screw delivers reliable performance where high-strength and precision fastening are paramount.

Specification Summary & Compliance

This set screw features a 4-48 UNF thread with Class 3A fit for high precision, a thread diameter of 0.112", and a length of 1/4". It complies with ASME B18.3 manufacturing standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and reliability in industrial use.