S-90403A144 6-32 x 1/4" 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 vibration resistance through the integrated internal-tooth lock washer that maintains clamping force under dynamic loads
- Enhanced corrosion protection with zinc-plated steel construction for extended service life in industrial environments
- High-strength performance delivering 60,000 PSI tensile strength and Rockwell B69 hardness for reliable fastening in demanding applications
- Quick installation efficiency with Phillips No. 2 drive and coarse UNC threads that reduce assembly time and effort
- Precise thread engagement with Class 2A fit ensuring consistent mating with standard nuts and threaded components
- Full-threaded design providing maximum grip length and uniform stress distribution along the entire fastener
- Regulatory compliance assurance meeting ASME B18.13 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These zinc-plated steel screws with internal-tooth lock washers solve critical vibration-induced loosening problems in industrial machinery, electrical enclosures, and automotive assemblies. The Phillips pan head design offers low-profile installation while the coarse 6-32 UNC threads provide rapid engagement in various materials. The combination of 60,000 PSI tensile strength and Rockwell B69 hardness ensures these rounded head screws maintain integrity under cyclic loading, making them ideal for applications where vibration resistance and reliable clamping force are essential. The fully threaded construction maximizes surface contact for superior load distribution in both soft and hard substrates.
Specification Summary & Compliance
This 1/4" length screw features Class 2A thread fit with right-hand UNC coarse threads (6-32) and meets ASME B18.13 manufacturing specifications. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The internal-tooth lock washer provides consistent locking performance while the zinc-plated steel construction offers corrosion resistance for extended service life in industrial applications.
