S-91997A218 10-32 x 5/8" ASME B18.3 Sealing Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance – Integrated Buna-N rubber O-ring creates reliable seals against fluids and gases, preventing leaks in high-pressure environments up to 1500 psi.
• Exceptional Corrosion Resistance – 18-8 stainless steel construction with passivated finish ensures long-term durability in harsh or humid industrial settings.
• Tamper-Resistant Security – Torx T25 drive with tamper-resistant design deters unauthorized removal while allowing secure installation with standard tools.
• Precision Thread Fit – Class 3A UNF fine threads provide tight, vibration-resistant connections with superior load distribution.
• Wide Temperature Tolerance – Maintains sealing integrity across extreme temperatures from -40° to 225°F without O-ring degradation.
• Maximum Pressure Containment – Engineered to seal effectively in applications requiring up to 1500 psi pressure resistance.
• Regulatory Compliance Assurance – Meets ASME B18.3 specifications with RoHS 3 and REACH compliance for global industrial use.

Professional Applications & Engineering Value

This 10-32 UNF rounded head screw delivers critical sealing solutions where fluid containment and tamper resistance are paramount. The 18-8 stainless steel body with passivated finish resists chemical attack and corrosion in demanding environments like chemical processing, marine equipment, and outdoor machinery. The Buna-N rubber O-ring maintains elasticity across extreme temperature swings (-40° to 225°F), ensuring consistent sealing performance in HVAC systems, hydraulic assemblies, and pneumatic controls. The tamper-resistant Torx drive (T25) prevents vandalism in public infrastructure while allowing high-torque installation. With Class 3A thread fit and full threading, it creates leak-proof joints in panels, access covers, and fluid handling components where pressure integrity to 1500 psi is non-negotiable.

Specification Summary & Compliance

Manufactured to ASME B18.3 standards with Class 3A thread fit precision for UNF 10-32 threading. Features right-hand direction, fine thread spacing, and fully threaded design. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. Material certification includes 18-8 stainless steel with Rockwell B70 hardness and 70,000 psi tensile strength. O-ring material meets Buna-N rubber specifications for temperature resistance.