S-91301A180 1/2"-20 x 1/4" Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments.
• Exceptional thread precision with Class 3A fit, ensuring reliable, vibration-resistant fastening in critical assemblies.
• High strength and durability from alloy steel and Rockwell C45 hardness, resisting wear under heavy loads.
• Secure, slip-resistant installation via 1/4" hex drive, allowing high torque application without head protrusion.
• Optimal fine thread engagement with 1/2"-20 UNF right-hand threads, providing enhanced clamping force in fine-pitch applications.
• Regulatory compliance assurance with RoHS 3 and REACH, meeting global environmental and safety standards for B2B procurement.
• Compact headless design enabling flush mounting in space-constrained machinery and rotating components.

Professional Applications & Engineering Value

This black-oxide alloy steel set screw is engineered to address common industrial challenges like component slippage, vibration loosening, and corrosion in precision equipment. Its Class 3A thread fit and fine UNF threads deliver superior holding power in assemblies requiring minimal clearance, such as shaft collars, gears, and pulleys. The hex drive design ensures easy installation with standard tools, while the headless construction prevents interference in rotating parts. Ideal for automotive, aerospace, and heavy machinery, it combines high hardness (Rockwell C45) with environmental compliance, reducing maintenance needs and downtime in demanding applications.

Specification Summary & Compliance

This set screw adheres to inch system measurements with a 1/2"-20 UNF fine thread and Class 3A thread fit for precise tolerances. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Manufactured from alloy steel with a black-oxide surface treatment, it maintains consistent performance in industrial settings.