S-99355A314 1/4"-20 x 1" ASME B18.3 Tamper-Resistant Asymmetrical-Drive Stainless Steel Button Head Screws
Tamper-Resistant Asymmetrical-Drive Stainless Steel Button Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh environments and long-term reliability
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Reliable fastening performance ensured by UNC coarse threading and Class 2A thread fit for easy assembly and vibration resistance
- Optimized head design with a rounded button profile providing a low-profile, finished appearance and reduced snagging
- Full threading along the 1" length maximizes grip and load distribution across the entire fastener
- Compliance with major standards including ASME B18.3 for dimensional accuracy and RoHS 3/REACH for environmental safety
- Right-hand thread direction ensures standard, intuitive installation for efficient assembly line operations
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 18-8 stainless steel rounded head screws deliver outstanding corrosion resistance and mechanical integrity. The UNC coarse thread design ensures quick assembly and reduced cross-threading risks, while the fully threaded 1" length provides consistent clamping force in materials prone to vibration or thermal expansion. Ideal for machinery, automotive assemblies, and electronic enclosures, these ASME B18.3 compliant fasteners solve common challenges like galvanic corrosion and fastener fatigue, offering a reliable, RoHS and REACH compliant solution for OEMs and maintenance teams seeking durable, specification-grade components.
Specification Summary & Compliance
This 1/4"-20 x 1" screw adheres to Class 2A thread fit tolerances and UNC coarse thread specifications per ASME B18.3. Manufactured from 18-8 stainless steel with a rounded button head profile, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, ensuring environmental and safety standards are upheld for industrial and international use.
