S-94115A558 1/4"-20 x 1 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Secure, Non-Marring Fastening: The green nylon 6/6 plastic tip prevents damage to contact surfaces and resists loosening from vibration, ensuring a clean and reliable hold.
• Superior Corrosion Resistance: The black-oxide finish on the alloy steel body provides a durable layer of protection against rust and wear in demanding environments.
• High-Strength & Durable Construction: Made from alloy steel with a Rockwell C28 hardness, this set screw offers excellent strength and resistance to shear forces for long-term performance.
• Precision Thread Fit for Reliability: The UNC Class 3A thread fit ensures tight tolerances and a secure, precise engagement, minimizing the risk of cross-threading and failure.
• Wide Operational Temperature Range: The nylon tip maintains its integrity in temperatures from -50° to 250° F, making it suitable for applications with thermal cycling.
• Easy Installation in Confined Spaces: The headless design with a 1/8" hex drive allows for installation flush with or below the surface, ideal for compact assemblies.
• Industry-Standard Compliance: Manufactured to meet ASME B18.3 specifications and compliant with RoHS 3 and REACH regulations, ensuring quality and environmental safety.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to solve critical challenges in industrial assembly and maintenance. Its headless design and hex drive provide a low-profile solution for securing components like gears, pulleys, and collars onto shafts without protruding, which is vital in machinery with limited clearance. The coarse UNC thread allows for rapid installation and high resistance to vibrational loosening, while the Class 3A thread fit guarantees precise alignment and a strong, reliable clamp. The integrated nylon 6/6 plastic tip adds significant engineering value by acting as a locking element that dampens vibrations and prevents marring on finished shafts, making it ideal for applications in automotive, aerospace, and precision equipment where surface integrity and fastener retention are paramount.

Specification Summary & Compliance

This set screw features a 1/4"-20 UNC coarse thread with a precision Class 3A thread fit for accurate engagement. The dimensions include a length of 1 1/2" and a drive size of 1/8" hex. It is manufactured in compliance with the ASME B18.3 standard for set screws. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to strict environmental and safety regulations for industrial use.