S-98164A545 1/2"-20 x 3/4" 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 in harsh environments thanks to 316 stainless steel construction and passivated finish
- Exceptional thread engagement and vibration resistance with precision-machined 1/2"-20 UNF Class 3A fine threading
- High mechanical strength under load with 70,000 psi tensile strength and Rockwell B55 hardness rating
- Secure, high-torque installation enabled by the 5/16" hex drive and rounded button head design
- Full-length fastening capability across the entire 3/4" length with fully threaded construction
- Reliable compliance for regulated industries meeting ASME B18.3, ASTM F879, RoHS 3, and REACH standards
- Optimized for confined spaces with low-profile rounded head design requiring minimal clearance
Professional Applications & Engineering Value
This 316 stainless steel rounded head screw delivers critical performance advantages in demanding industrial applications where corrosion resistance and thread reliability are paramount. The combination of UNF Class 3A fine threading provides superior vibration resistance in machinery, automotive, and marine equipment, while the passivated finish enhances protection against chemicals, saltwater, and industrial atmospheres. The hex drive configuration ensures secure installation in high-torque scenarios, and the rounded button head offers a finished appearance while minimizing snagging hazards. These fully threaded screws maintain consistent clamping force across the entire fastener length, making them ideal for precision assemblies requiring uniform pressure distribution and reliable long-term performance.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit for precision applications, this fastener meets ASME B18.3 dimensional specifications and ASTM F879 material requirements. The screw maintains compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial markets. Critical dimensions include 1/2"-20 UNF fine threading, 3/4" length, 0.875" head diameter, and 5/16" hex drive size, all manufactured from 316 stainless steel with passivated surface treatment.
