S-90343A110 4-40 x 1/4" 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
- Vibration-resistant locking with epoxy adhesive prevents loosening in high-stress applications
- Superior corrosion resistance from 18-8 stainless steel construction for extended service life
- Precision Class 3A thread fit ensures reliable engagement and consistent clamping force
- High tensile strength (70,000 psi) withstands extreme mechanical loads without failure
- Wide temperature tolerance (-60° to 300°F) maintains performance across diverse operating environments
- Quick-setting epoxy begins hardening in 15 minutes for efficient assembly processes
- ASME B18.3 compliance guarantees dimensional accuracy and interchangeability
Professional Applications & Engineering Value
This 4-40 UNC socket head cap screw delivers critical reliability where vibration resistance and precise alignment are paramount. The epoxy thread locker chemically bonds to mating surfaces, creating permanent fixation that outperforms mechanical locking methods in high-cycle applications. Manufactured from 18-8 stainless steel, these fasteners provide excellent corrosion resistance while maintaining Rockwell B70 hardness for durability. The Class 3A thread fit and coarse UNC thread form ensure rapid installation in machinery, electronic enclosures, and precision equipment where fully threaded design maximizes engagement depth. The hex drive configuration allows high torque application in confined spaces, making these industrial fasteners ideal for maintenance-critical assemblies.
Specification Summary & Compliance
This fastener meets ASME B18.3 specifications with 4-40 UNC coarse threads in Class 3A fit for precision engagement. The fully threaded design provides consistent clamping force along the entire 1/4" length. Manufacturing complies with dimensional standards for socket head profile and hex drive configuration. The epoxy adhesive locking system reaches full strength within 24 hours, creating permanent vibration resistance across the specified temperature range.
