S-98164A423 2-56 x 1/8" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness to withstand high-stress applications
• Precise thread engagement with Class 3A thread fit ensuring reliable, vibration-resistant connections in critical assemblies
• Optimized drive efficiency through hex drive design providing superior torque transmission and reduced cam-out risk
• Full regulatory compliance meeting ASME B18.3 standards plus RoHS 3 and REACH environmental regulations
• Complete threading coverage along the entire shank length for maximum grip and load distribution
• Easy installation access with low-profile rounded button head design for confined space applications

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 2-56 UNC thread rounded head screws deliver critical performance advantages where corrosion resistance and mechanical reliability are paramount. The 316 Stainless Steel composition combined with passivated finish provides exceptional protection against chemical exposure and atmospheric corrosion, making these fasteners ideal for marine, chemical processing, and food industry applications. The coarse thread design ensures rapid installation and superior holding power in softer materials, while the Class 3A thread fit maintains precise tolerances for vibration-resistant assemblies. The hex drive configuration allows for high-torque installation without stripping, and the rounded button head profile offers a clean, low-profile finish that minimizes snagging in tight spaces. These fully threaded fasteners provide uniform stress distribution across the entire engagement length, preventing localized failure points in critical connections.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit tolerances ensuring precision threading compatibility. The inch-system fasteners feature 2-56 UNC coarse threads with right-hand orientation and full threading along the 1/8" length. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming adherence to the latest international standards for hazardous substance restrictions.