S-92949A837 1/4"-20 x 1 5/8" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 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 for heavy-duty applications
• Precise thread engagement with Class 3A thread fit ensuring reliable, vibration-resistant connections
• Optimized drive efficiency featuring 5/32" hex drive for secure tool engagement and reduced cam-out risk
• Full-threaded design providing maximum grip length and uniform load distribution
• Regulatory compliance meeting ASME B18.3 specifications for dimensional accuracy and performance standards
• Environmental responsibility with RoHS 3 and REACH compliance for restricted substance control

Professional Applications & Engineering Value

These 18-8 stainless steel rounded head screws with UNC coarse threading and passivated finish deliver critical performance advantages for industrial assembly. The combination of Class 3A thread fit and fully threaded design ensures superior vibration resistance and load distribution in machinery, equipment manufacturing, and structural applications. The rounded button head profile provides a finished appearance while the hex drive enables high-torque installation. Engineered to withstand corrosive environments and heavy mechanical stress, these ASME B18.3 compliant screws offer reliable fastening solutions where precision and durability are paramount.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with UNC 1/4"-20 coarse threads and Class 3A thread fit for precision dimensional accuracy. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include 1-5/8" length, 5/32" hex drive, and full threading per industrial standards.