S-90403A191 8-32 x 5/16" ASME B18.13 Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer
Steel Pan Head Phillips Screws with Internal-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, ensuring long-lasting performance in harsh industrial environments
- Reliable vibration resistance through integrated internal-tooth lock washers that prevent loosening under dynamic loads
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B69 hardness for demanding applications
- Easy installation and removal with Phillips No. 2 drive and fully threaded coarse UNC design
- Precise thread engagement with Class 2A thread fit ensuring consistent performance and compatibility
- Wide industrial compatibility meeting ASME B18.13 standards for reliable mechanical fastening
- Environmental compliance with RoHS 3 and REACH regulations for safe use across global markets
Professional Applications & Engineering Value
These 8-32 UNC zinc-plated steel rounded head screws with integrated internal-tooth lock washers provide critical vibration resistance in industrial assemblies where mechanical stability is paramount. The coarse thread design ensures rapid installation in various materials while maintaining Class 2A thread fit precision. The zinc-plated steel construction offers excellent corrosion protection for equipment exposed to moisture or chemicals. The Phillips drive facilitates efficient installation in confined spaces, while the pan head profile provides a low-profile finish. These screws deliver reliable performance in machinery, electrical enclosures, and automotive components where vibration-induced loosening would compromise system integrity.
Specification Summary & Compliance
This fastener features Class 2A thread fit with UNC coarse threading (8-32 size) and fully threaded design for maximum engagement. Manufacturing complies with ASME B18.13 specifications, ensuring dimensional accuracy and performance reliability. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental regulations for hazardous substances. The internal-tooth lock washer provides consistent locking performance while maintaining the zinc-plated corrosion protection throughout the assembly.
