S-99553A453 1/4"-20 x 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Precise thread engagement through Class 3A fit UNC coarse threads, ensuring reliable fastening and vibration resistance
• Enhanced durability from Rockwell B80 hardness, providing excellent mechanical strength and wear resistance
• Secure installation with 1/8" hex drive in a headless design, allowing flush mounting in confined spaces
• Reduced component damage thanks to the oval tip, which minimizes marring on contact surfaces
• Broad industrial compatibility with right-hand coarse threading (1/4"-20 UNC), suitable for various machinery and equipment
• Regulatory peace of mind by meeting ASME B18.3, RoHS 3, and REACH standards for safety and environmental compliance

Professional Applications & Engineering Value

This 316 stainless steel set screw delivers exceptional performance in demanding industrial settings where corrosion and mechanical stress are concerns. Its Class 3A thread fit and UNC coarse threads provide superior holding power, reducing the risk of loosening under vibration—common in assembly lines, automotive components, and marine equipment. The headless design with hex drive enables easy installation in tight spaces, while the oval tip protects shaft surfaces from damage. Engineered for longevity, it solves issues of fastener failure in acidic or humid conditions, making it a reliable choice for OEMs and maintenance teams seeking durable, RoHS and REACH compliant solutions.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, with precise 1/4"-20 UNC coarse threads and Class 3A thread fit for tight tolerances. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety compliance. Dimensions include a 1/2" length and 1/8" hex drive, with material hardness rated at Rockwell B80 for consistent performance.