S-98164A686 1/4"-28 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 due to 316 stainless steel construction and passivated finish
- Exceptional thread engagement and vibration resistance provided by the UNF fine thread with precise Class 3A fit
- High-strength performance with 70,000 psi tensile strength for demanding industrial applications
- Secure, slip-resistant installation enabled by the hex drive and rounded button head design
- Full-length threading ensures maximum grip and consistent fastening along the entire 1 1/2" length
- Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and safety
- Reliable chemical resistance making it ideal for marine, chemical processing, and high-moisture applications
Professional Applications & Engineering Value
This 316 stainless steel rounded head screw delivers critical performance in corrosive and demanding environments where fastener failure is not an option. The combination of UNF fine thread and Class 3A thread fit provides superior vibration resistance and precise alignment in machinery, electronics, and precision equipment. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, making these hex drive screws ideal for chemical processing plants, marine hardware, and food processing equipment where exposure to chlorides and aggressive chemicals is common. The rounded button head offers a clean, finished appearance while the 5/32" hex drive ensures secure tool engagement during installation, preventing stripping and ensuring consistent torque application.
Specification Summary & Compliance
This fastener features precision 1/4"-28 UNF fine threads with Class 3A thread fit for exceptional dimensional accuracy. Manufactured to ASME B18.3 specifications (ASTM F879) with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The screw maintains 70,000 psi tensile strength throughout its 1 1/2" fully threaded length, ensuring reliable performance in industrial fastening applications.
