S-90343A138 5/16"-18 x 3/4" ASME B18.3 18-8 Stainless Steel Thread-Locking Socket Head Screws
18-8 Stainless Steel Thread-Locking Socket Head 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
- Permanent vibration resistance with epoxy thread locker that maintains integrity from -60° to 300°F
- Superior corrosion protection through 18-8 stainless steel construction for extended service life
- Precise thread engagement with Class 3A UNC coarse threads ensuring reliable fastening in demanding applications
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B70 hardness
- Optimized torque transmission via 1/4" hex drive socket for secure installation without stripping
- Full-length threading providing consistent holding power across the entire 3/4" length
- Industry-standard compliance meeting ASME B18.3 specifications for guaranteed interchangeability
Professional Applications & Engineering Value
Engineered for critical industrial applications where vibration-induced loosening compromises safety and performance, this socket head cap screw combines 18-8 stainless steel's corrosion resistance with a permanent epoxy thread locker that cures to full strength within 24 hours. The Class 3A UNC coarse threads provide superior engagement in soft materials and high-vibration environments, while the hex socket drive enables high-torque installation in confined spaces. Ideal for machinery assembly, automotive components, and structural frameworks, this fastener maintains clamping force under extreme thermal cycling from -60° to 300°F, eliminating the need for secondary locking mechanisms and reducing maintenance frequency in industrial fastening systems.
Specification Summary & Compliance
This socket head cap screw features precision 5/16"-18 UNC Class 3A threads with coarse spacing and right-hand direction, manufactured to ASME B18.3 specifications for dimensional accuracy and interchangeability. The fully threaded 3/4" length provides consistent engagement, while the epoxy adhesive thread locker begins hardening in 15 minutes and reaches full strength in 24 hours. Manufactured from 18-8 stainless steel with Rockwell B70 hardness and 70,000 psi tensile strength, this fastener meets industrial standards for high-performance applications requiring reliable, permanent fastening solutions.
