S-98164A466 1/4"-20 x 3 1/2" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction with passivated finish
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
• Precise thread engagement with Class 3A UNC coarse threads ensuring reliable fastening and vibration resistance
• Easy installation and removal with 5/32" hex drive providing secure tool engagement in confined spaces
• Full-length threading offering maximum grip length and versatility across various material thicknesses
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations (RoHS 3 & REACH)
• Rounded button head design providing a low-profile, aesthetically pleasing finish while minimizing snagging hazards

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 stainless steel rounded head screws deliver exceptional performance where corrosion resistance is critical. The combination of 70,000 psi tensile strength and Rockwell B55 hardness ensures reliable performance in structural applications, while the passivated finish enhances surface durability against chemical exposure. The UNC coarse threading with Class 3A fit provides superior vibration resistance in machinery, automotive, and marine applications. The 5/32" hex drive allows for efficient installation in confined spaces, making these fully threaded screws ideal for assembly lines requiring rapid, secure fastening. These characteristics make them particularly valuable for chemical processing equipment, marine hardware, and food processing machinery where both strength and corrosion resistance are paramount.

Specification Summary & Compliance

This 1/4"-20 x 3 1/2" rounded head screw features precision UNC coarse threads with Class 3A fit for optimal thread engagement and dimensional accuracy. Manufactured to ASME B18.3 specifications, the fastener ensures consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict regulatory adherence. The combination of 316 stainless steel material and passivated surface treatment provides enhanced corrosion protection while maintaining mechanical integrity in demanding service conditions.