S-95198A171 1/4"-20 x 3/8" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior sealing performance with a silicone rubber O-ring that withstands temperatures from -80° to 400°F, preventing leaks in demanding environments.
• Exceptional corrosion resistance thanks to 18-8 Stainless Steel construction, ensuring long-term durability and reliability in harsh conditions.
• High tensile strength of 100,000 psi and Rockwell B85 hardness for reliable load-bearing and resistance to deformation under stress.
• Precise Class 3A thread fit provides tighter tolerances and superior engagement, reducing the risk of loosening in critical assemblies.
• Robust pressure handling up to 1500 psi, making it ideal for high-pressure fluid and gas systems requiring secure sealing.
• Wide industry compliance with ASME B18.3, DIN 912, and ISO 4762 standards, ensuring interchangeability and quality in global applications.
• Easy installation and removal with a standard hex drive (3/16"), allowing for efficient assembly with common tools.

Professional Applications & Engineering Value

This Socket Head Cap Screw is engineered to address critical challenges in industrial sealing and fastening. The 18-8 Stainless Steel material offers excellent resistance to corrosion and oxidation, while the silicone rubber O-ring ensures a reliable seal against fluids and gases, even under extreme temperature fluctuations from -80° to 400°F. The fully threaded design with UNC coarse threads and Class 3A fit provides superior holding power and vibration resistance, making it ideal for high-pressure applications like hydraulic systems, pneumatic equipment, and machinery where leak prevention is paramount. Its compliance with ASME B18.3, DIN 912, and ISO 4762 standards guarantees consistency and safety in automotive, aerospace, and manufacturing sectors, reducing downtime and maintenance costs.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread with Class 3A precision fit and coarse thread spacing for robust engagement. Dimensions include a 3/8" length, 3/8" head diameter, and 3/16" hex drive size. It meets ASME B18.3, DIN 912, and ISO 4762 specifications for dimensional accuracy and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations without hazardous substances.