S-95198A406 1/2"-20 x 3/4" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance – Integrated Buna-N O-ring provides reliable leak prevention in high-pressure applications up to 1500 psi.
• Exceptional Corrosion Resistance – 18-8 Stainless Steel construction ensures long-term durability in harsh or humid environments.
• High Tensile Strength – Rated at 100,000 psi for secure, vibration-resistant fastening in demanding assemblies.
• Precision Thread Fit – Class 3A UNF fine threads offer tighter engagement and improved load distribution.
• Wide Temperature Tolerance – O-ring remains effective from -40°F to 225°F, supporting use in varied thermal conditions.
• Easy Installation with Standard Tools – 3/8" hex drive socket head allows for straightforward torque application in confined spaces.
• Full Thread Engagement – Fully threaded design ensures consistent clamping force along the entire 3/4" length.

Professional Applications & Engineering Value

This Socket Head Cap Screw is engineered for industrial applications where both mechanical integrity and fluid sealing are critical. The 18-8 Stainless Steel body resists oxidation and chemical exposure, while the Buna-N rubber O-ring creates a dependable seal against oils, water, and compressed gases. Its Class 3A UNF fine thread enhances fatigue resistance and minimizes loosening under dynamic loads. Ideal for hydraulic systems, pump housings, and machinery enclosures, this fastener solves common challenges like pressure loss, thread stripping, and corrosion-induced failure—ensuring assembly longevity with minimal maintenance.

Specification Summary & Compliance

This screw adheres to ASME B18.3, DIN 912, and ISO 4762 dimensional standards, with a Class 3A thread fit for precise, high-strength engagements. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in regulated and international markets. The combination of a 0.5" thread diameter, 3/4" length, and 3/8" hex drive ensures compatibility with standard installation tools and designed clearances.