S-92949A554 1/4"-20 x 3" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish for extended service life in harsh environments
• Exceptional tensile strength rated at 70,000 psi ensures reliable performance under heavy loads and vibration
• Precise Class 3A thread fit provides superior engagement and reduces the risk of cross-threading during installation
• Hex drive design with 5/32" drive size offers secure tool engagement and high torque transmission without cam-out
• Rounded button head profile creates a low-profile, finished appearance while minimizing snagging hazards
• Full threading along the 3" length enables maximum adjustability and holding power throughout the entire fastener
• Consistent Rockwell B55 hardness maintains dimensional stability and prevents deformation under stress

Professional Applications & Engineering Value

These 1/4-20 x 3" rounded head hex drive screws deliver critical performance advantages for industrial applications where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 stainless steel material with passivated surface treatment provides exceptional protection against oxidation and chemical exposure in manufacturing, marine, and food processing environments. The UNC coarse thread configuration with Class 3A precision fit ensures rapid installation and secure fastening in demanding assembly operations, while the hex drive system prevents tool slippage that can damage fastener heads and compromise joint integrity. These fully threaded screws maintain consistent 70,000 psi tensile strength across the entire 3-inch length, making them ideal for structural applications requiring uniform clamping force distribution.

Specification Summary & Compliance

This rounded head screw features precise 1/4"-20 UNC coarse threads with Class 3A thread fit tolerance for superior engagement accuracy. Manufacturing complies with ASME B18.3 dimensional specifications, ensuring interchangeability and reliability. The fastener meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) standards for chemical safety, making it suitable for global industrial applications with stringent environmental requirements.