S-90403A085 2-56 x 5/8" 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
- Vibration-resistant locking with integrated internal-tooth lock washer prevents loosening under dynamic loads
- Superior corrosion protection through zinc-plated steel construction for extended service life
- High-strength performance with 60,000 psi tensile strength and Rockwell B69 hardness rating
- Quick installation with Phillips No. 1 drive and coarse UNC threads for efficient assembly
- Reliable thread engagement through Class 2A thread fit and full threading along the 5/8" length
- Secure fastening solution combining pan head design with lock washer for industrial applications
- Regulatory compliance meeting ASME B18.13 specifications and environmental standards
Professional Applications & Engineering Value
These zinc-plated steel pan head screws with internal-tooth lock washers provide critical vibration resistance in demanding industrial environments. The combination of UNC coarse threads and Class 2A thread fit ensures reliable fastening in materials where vibration-induced loosening typically compromises joint integrity. The fully threaded 2-56 design offers maximum grip length while the Phillips drive enables efficient installation in confined spaces. Ideal for electrical enclosures, machinery guards, and automotive assemblies, these screws maintain clamping force through the lock washer's positive engagement, preventing costly downtime from fastener failure in high-vibration applications.
Specification Summary & Compliance
Manufactured to ASME B18.13 specifications with Class 2A thread fit tolerance for consistent performance. Features UNC coarse threads (2-56) with right-hand direction and full threading along the 5/8" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries. The zinc-plated steel construction meets industrial standards for corrosion resistance and mechanical performance.
