S-95198A259 2-56 x 1/4" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws
Sealing Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
Installation & Application
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Key Features & Benefits at a Glance
- Superior sealing performance with integrated Buna-N rubber O-ring that prevents leaks in demanding applications
- Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments
- High tensile strength rating of 100,000 psi ensures reliable fastening under extreme mechanical stress
- Precision Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
- Wide temperature compatibility from -40° to 225°F maintains sealing integrity across diverse operating conditions
- Maximum pressure handling up to 1500 psi for high-pressure fluid and gas systems
- Standard hex socket drive allows for secure installation in confined spaces with common tools
Professional Applications & Engineering Value
This 2-56 UNC Class 3A socket head cap screw delivers critical sealing performance where standard fasteners fail. The 18-8 stainless steel construction combined with the Buna-N rubber O-ring creates a reliable barrier against fluid and gas penetration, solving leakage issues in high-pressure applications up to 1500 psi. Engineers specify this fastener for precision equipment, hydraulic systems, and industrial machinery where thread accuracy and environmental resistance are paramount. The coarse UNC threads provide rapid installation while maintaining the Class 3A fit necessary for vibration-prone environments, making it ideal for assembly lines requiring both speed and reliability.
Specification Summary & Compliance
This socket head cap screw features precision 2-56 UNC Class 3A threads with exacting dimensional tolerances per ASME B18.3, DIN 912, and ISO 4762 standards. The fastener maintains Rockwell B85 hardness and meets critical industry regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) certification, ensuring environmental responsibility and material safety in global industrial applications.
