S-98164A520 1/4"-28 x 3/8" 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 with passivated surface treatment
- Precise thread engagement with Class 3A UNF fine threads ensuring reliable, vibration-resistant fastening in critical applications
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty industrial use
- Easy installation and removal with standardized 5/32" hex drive compatible with common industrial tools
- Maximum grip and coverage from fully threaded design and rounded button head profile for secure, flush-mounted applications
- Regulatory compliance assurance meeting ASME B18.3 specifications and international RoHS 3/REACH environmental standards
- Optimized for fine-thread applications where vibration resistance and precise torque control are critical requirements
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 316 stainless steel rounded head screws deliver exceptional performance where corrosion resistance and mechanical reliability are paramount. The UNF Class 3A fine threading provides superior vibration resistance in machinery, automotive, and marine applications, while the passivated finish enhances surface durability against chemical exposure. The combination of 70,000 psi tensile strength and fully threaded design ensures maximum load distribution and thread engagement, making these hex drive screws ideal for precision assembly operations requiring repeated maintenance access. Their compliance with ASME B18.3 standards guarantees dimensional consistency and interchangeability across industrial equipment and manufacturing systems.
Specification Summary & Compliance
This 1/4"-28 UNF screw features precision Class 3A thread fit with fine spacing for superior engagement tolerance. Manufactured to ASME B18.3 specifications (ASTM F879) with complete RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance. The 316 stainless steel construction maintains dimensional stability with 0.25" thread diameter and 3/8" length, while the passivated finish provides enhanced surface protection without compromising mechanical properties.
