S-98164A218 1/4"-20 x 1 1/4" 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 from 316 stainless steel construction, ideal for harsh chemical and marine environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
- Precise thread engagement with Class 3A fit UNC coarse threads ensuring secure fastening and vibration resistance
- Enhanced durability through passivated surface finish providing extra protection against oxidation and wear
- Easy installation and removal with 5/32" hex drive design offering superior torque transmission
- Full-threaded design maximizing grip length and distribution for stronger joint integrity
- Regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe industrial use
Professional Applications & Engineering Value
This 316 stainless steel rounded head screw delivers critical performance in demanding industrial settings where corrosion resistance and mechanical reliability are paramount. The passivated finish enhances its already excellent resistance to chlorides, acids, and extreme temperatures, making it ideal for chemical processing, marine equipment, and food-grade applications. With its UNC coarse thread and Class 3A fit, it ensures rapid assembly and secure fastening even in high-vibration environments. The hex drive design provides superior torque transmission compared to standard drives, reducing installation time and tool slippage. Fully threaded along its 1-1/4" length, it offers maximum engagement in thick materials or when additional clamping force is required.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with UNC coarse threads and Class 3A thread fit for precision dimensional accuracy. Complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include 1/4"-20 thread size, 5/32" hex drive, 0.437" head diameter, and full threading. Material certification includes 316 stainless steel with passivated finish, Rockwell B55 hardness, and 70,000 psi tensile strength.
