S-95198A357 5/16"-18 x 1 1/4" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior sealing performance with Buna-N rubber O-rings that withstand pressures up to 1500 psi and temperatures from -40° to 225°F, preventing leaks in demanding environments.
• Exceptional corrosion resistance thanks to 18-8 stainless steel construction, ensuring long-term reliability in harsh or humid conditions.
• High-strength durability with 100,000 psi tensile strength and Rockwell B85 hardness, providing reliable fastening under heavy loads.
• Precise, secure threading featuring Class 3A UNC coarse threads for easy assembly and reduced risk of cross-threading in industrial applications.
• Easy installation and removal with a standard hex drive (1/4") and socket head design, allowing for efficient maintenance with common tools.
• Versatile fully threaded design enabling consistent clamping force along the entire 1-1/4" length, ideal for varied material thicknesses.
• Broad compatibility with a maximum hole diameter of 0.332", fitting standard industrial setups without modification.

Professional Applications & Engineering Value

This socket head cap screw is engineered to address critical sealing and strength challenges in high-pressure systems, such as hydraulic assemblies, pneumatic equipment, and fluid handling machinery. The 18-8 stainless steel material offers excellent resistance to corrosion and oxidation, while the Buna-N rubber O-ring ensures a reliable seal against leaks, even under fluctuating temperatures and pressures. The Class 3A UNC coarse thread provides a tight, precise fit that minimizes vibration loosening and simplifies installation in coarse-threaded components. With its hex drive and fully threaded shank, it delivers consistent performance in applications requiring repeated disassembly, reducing downtime and maintenance costs in industrial and manufacturing settings.

Specification Summary & Compliance

This fastener meets ASME B18.3, DIN 912, and ISO 4762 standards for dimensional accuracy and performance. It features a Class 3A thread fit for precise tolerances and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. The screw is right-hand threaded with UNC coarse spacing and is designed for maximum hole diameters of 0.332".