S-98164A276 5/16"-18 x 1 1/2" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive 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 in harsh environments thanks to 316 stainless steel construction with passivated finish
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Precise thread engagement with Class 3A thread fit ensuring reliable, vibration-resistant fastening
- Easy installation and removal with 3/16" hex drive providing secure tool engagement without stripping
- Full-threaded design delivers maximum grip length and load distribution across the entire fastener
- Compliant with industry standards including ASME B18.3 for consistent quality and interchangeability
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for global supply chain compatibility
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 316 stainless steel rounded head screws provide exceptional resistance to chemicals, saltwater, and extreme temperatures. The UNC coarse thread spacing enables faster installation and superior performance in soft materials or where vibration loosening is a concern. With fully threaded design and Class 3A thread fit, these fasteners deliver maximum clamping force and prevent back-off in high-vibration applications such as machinery, marine equipment, and chemical processing systems. The rounded button head profile offers a low-profile finish while the hex drive ensures secure tool engagement during torque-critical assembly operations.
Specification Summary & Compliance
This 5/16"-18 UNC screw features precise Class 3A thread fit with coarse spacing and full threading along the 1½" length. Manufactured to ASME B18.3 specifications (ASTM F879) with 316 stainless steel material and passivated finish for enhanced corrosion protection. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance.
