S-94115A547 1/4"-20 x 1" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: The green nylon 6/6 plastic tip deforms slightly under pressure to create a secure, non-marring grip that prevents loosening in high-vibration environments.
• Superior corrosion protection: The black-oxide finish on the alloy steel body provides a durable layer of resistance against rust and corrosion, extending the screw's service life.
• High-strength, precision threading: UNC coarse Class 3A threads ensure a tighter, more precise fit for maximum holding power and reliable performance in demanding applications.
• 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.
• Exceptional durability under stress: A Rockwell C28 hardness rating guarantees the screw maintains its form and strength, resisting wear and deformation.
• Wide operational temperature range: The nylon tip performs reliably from -50° to 250° F, making it suitable for applications exposed to extreme thermal cycles.
• Guaranteed material safety: Compliant with RoHS and REACH regulations, ensuring the screw is free from hazardous substances for safe use in various industries.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to solve critical challenges in industrial assembly and maintenance. Its headless, hex drive design is perfect for applications where a protruding head is not feasible, such as in precision machinery, motor shafts, and collars. The UNC coarse thread with a Class 3A fit provides excellent engagement and resistance to vibrational loosening, a common failure point in dynamic systems. The nylon 6/6 plastic tip offers a secure, non-damaging lock on finished surfaces, preventing slippage and marring, which is vital in automotive, aerospace, and electronics manufacturing. By combining high Rockwell C28 hardness with a protective black-oxide coating, this screw delivers long-term reliability in harsh environments, reducing maintenance downtime and ensuring consistent performance.

Specification Summary & Compliance

This set screw adheres to strict dimensional and performance standards, including a Class 3A thread fit for precise tolerance and UNC coarse threading (1/4"-20). It is manufactured in compliance with the ASME B18.3 specification, ensuring uniformity and reliability. The product is also certified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming its safety and environmental responsibility for global industrial use.