S-95198A347 1/4"-28 x 1" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance – Integrated Buna-N rubber O-ring creates reliable fluid and gas seals, preventing leaks in high-pressure applications up to 1500 psi.
• Exceptional Corrosion Resistance – Made from 18-8 stainless steel, offering excellent durability in harsh environments and extended service life.
• Precision Thread Fit – Class 3A fine UNF threads ensure tight, accurate engagement and vibration resistance in critical assemblies.
• High Tensile Strength – 100,000 psi tensile strength and Rockwell B85 hardness provide reliable load-bearing capacity and resistance to stripping.
• Wide Temperature Tolerance – O-ring functions effectively from -40°F to 225°F, maintaining seal integrity across diverse operating conditions.
• Optimized Drive Engagement – 3/16" hex drive and standard socket head profile allow for secure tooling and efficient installation in confined spaces.
• Full Thread Coverage – Fully threaded design ensures consistent clamping force along the entire 1" length for uniform stress distribution.

Professional Applications & Engineering Value

This socket head cap screw is engineered for demanding industrial applications where sealing reliability and precision fit are critical. The 18-8 stainless steel construction resists corrosion in chemical, marine, and outdoor settings, while the Buna-N rubber O-ring effectively seals against fluids and gases in hydraulic systems, pumps, and compressors. The fine UNF thread with Class 3A fit minimizes backlash and maintains clamp load under vibration, making it ideal for machinery, automotive, and aerospace assemblies. Its high tensile strength and 1500 psi pressure rating ensure performance in high-stress environments, reducing maintenance needs and downtime.

Specification Summary & Compliance

This screw features a 1/4"-28 UNF fine thread with Class 3A tolerance for precise fit, a 3/16" hex drive, and fully threaded 1" length. It complies with ASME B18.3, DIN 912, and ISO 4762 standards, ensuring dimensional accuracy and interchangeability. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global use.