S-90600A134 5/16"-18 x 5/8" ASME B18.3 Stainless Steel Button Head Torx Screws
Stainless Steel Button Head Torx 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 with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
- Enhanced torque transmission and reduced cam-out through precision T40 Torx drive design
- Maximum thread engagement reliability with Class 3A thread fit for critical assembly applications
- Exceptional mechanical strength delivering 60,000 psi tensile strength and Rockwell B55 hardness
- Optimized for high-vibration environments with fully threaded coarse (UNC) design and right-hand threading
- Streamlined installation with rounded button head profile that eliminates snagging and provides a finished appearance
- Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
These 18-8 stainless steel rounded head screws with T40 Torx drive address critical challenges in industrial assembly where corrosion resistance, vibration resistance, and precise torque control are paramount. The passivated finish significantly enhances corrosion protection beyond standard stainless steel, making these fasteners ideal for marine, chemical processing, and outdoor equipment applications. The Class 3A thread fit ensures consistent clamping force in high-stress assemblies, while the fully threaded UNC coarse spacing provides superior holding power in various materials. The combination of 60,000 psi tensile strength and Rockwell B55 hardness delivers exceptional durability for heavy machinery, automotive components, and structural frameworks where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse thread spacing (5/16"-18). Complies with ASME B18.3 specifications for dimensional accuracy and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features include: 5/8" length, 0.547" head diameter, right-hand threading, and fully threaded design.
