S-94115A305 1/4"-28 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Secure, Non-Marring Fastening: Green nylon 6/6 plastic tip prevents damage to contact surfaces, ideal for protecting finished components.
• Enhanced Durability & Corrosion Resistance: Black-oxide finish on alloy steel provides a protective layer, extending service life in various industrial environments.
• Precise, Reliable Thread Engagement: Class 3A thread fit ensures tighter tolerances and superior holding power in demanding applications.
• High-Temperature & Chemical Resilience: Nylon tip maintains integrity across a wide temperature range from -50°F to 250°F.
• Optimized for High-Strength Applications: Rockwell C28 hardness offers excellent resistance to wear and deformation under load.
• Space-Saving, Flush Installation: Headless design with a 1/8" hex drive allows for compact assemblies and tool access in confined spaces.
• Industry-Standard Compliance: Manufactured to ASME B18.3 specifications, ensuring consistent quality and interchangeability.

Professional Applications & Engineering Value

This 1/4"-28 UNF set screw is engineered to address critical challenges in precision assembly and motion control systems. The black-oxide alloy steel construction, combined with a Rockwell C28 hardness, provides the necessary strength to resist loosening under vibration and torque, making it ideal for securing gears, pulleys, and collars on shafts. The fine thread (UNF) and Class 3A fit deliver superior clamping force and positional accuracy. The green nylon 6/6 plastic tip is a key feature for applications requiring non-marring contact, preventing damage to expensive components while maintaining a firm grip. This makes the fastener particularly valuable in manufacturing, automation, and precision machinery where surface integrity and reliable set screw performance are paramount.

Specification Summary & Compliance

This set screw features a 1/4"-28 UNF fine thread with a Class 3A thread fit for high precision. It is manufactured from alloy steel with a black-oxide surface treatment and complies with the ASME B18.3 standard. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental and safety regulations for industrial use.