S-95198A271 4-40 x 1/8" 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-proof sealing in high-pressure environments up to 1500 psi, reducing maintenance and downtime.
• Exceptional Corrosion Resistance: Made from 18-8 stainless steel, offering excellent durability and long-term performance in harsh or humid conditions.
• High Tensile Strength: Withstands up to 100,000 psi tensile strength, ensuring secure fastening under heavy loads and vibration.
• Wide Temperature Tolerance: O-ring functions effectively from -40° to 225°F, making it suitable for diverse industrial and outdoor applications.
• Precision Thread Fit: Class 3A UNC coarse threads ensure easy assembly, tight tolerances, and reduced risk of cross-threading.
• Compact and Versatile Design: 1/8" length and 3/32" hex drive allow for easy installation in confined spaces with standard tools.
• Regulatory Compliance: Meets ASME B18.3, DIN 912, and ISO 4762 standards, ensuring interchangeability and quality assurance.

Professional Applications & Engineering Value

This socket head cap screw with Buna-N O-ring seal is engineered to address critical sealing challenges in high-pressure applications such as hydraulic systems, pneumatic controls, and fluid handling equipment. The 18-8 stainless steel construction provides robust resistance to corrosion and oxidation, while the UNC coarse thread and Class 3A fit enable quick, secure installation without compromising seal integrity. Its fully threaded design and standard socket head profile ensure uniform clamping force and accessibility in tight spaces, making it an ideal choice for OEMs and maintenance professionals seeking reliable, temperature-resistant fastening solutions that prevent leaks and enhance system longevity.

Specification Summary & Compliance

This screw features a 4-40 UNC thread with Class 3A precision fit, ensuring accurate engagement and consistent performance. It complies with ASME B18.3, DIN 912, and ISO 4762 manufacturing standards for dimensional accuracy and reliability. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for use in various industries.