S-90402A191 8-32 x 5/16" ASME B18.13 Steel Pan Head Phillips Screws with External-Tooth Lock Washer
Steel Pan Head Phillips Screws with External-Tooth Lock Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc-plated steel construction for extended service life in harsh industrial environments
- Exceptional vibration resistance through integrated external-tooth lock washer preventing loosening under dynamic loads
- High-strength performance with 60,000 psi tensile strength and Rockwell B69 hardness for demanding applications
- Quick installation and removal with No. 2 Phillips drive and fully threaded coarse spacing design
- Reliable fastening security through Class 2A thread fit ensuring precise engagement and consistent clamping force
- Optimized load distribution with pan-style rounded head design and integrated washer system
- Industry compliance assurance meeting ASME B18.13 standards and environmental regulations
Professional Applications & Engineering Value
These 8-32 UNC zinc-plated steel screws with external-tooth lock washers deliver critical vibration resistance in industrial machinery, electrical enclosures, and automotive assemblies. The coarse thread spacing ensures rapid installation and superior holding power in materials where fine threads might strip, while the Rockwell B69 hardness maintains structural integrity under repeated stress cycles. The zinc-plated steel construction provides essential corrosion protection for equipment exposed to moisture or chemical environments. Engineered with fully threaded design and Class 2A thread fit, these rounded head screws maintain consistent clamping force where vibration-induced loosening would compromise safety and operational reliability.
Specification Summary & Compliance
Manufactured to ASME B18.13 specifications with Class 2A thread fit tolerance for reliable engagement. Features 8-32 UNC coarse threads with 5/16" length and No. 2 Phillips drive. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The external-tooth lock washer (0.32" OD, 0.023" thickness) and zinc-plated steel construction meet industrial fastener standards for durability and performance.
