S-90400A225 1/4"-20 x 1/2" ASME B18.13 Steel Pan Head Phillips Screws with Spring Lock Washer
Steel Pan Head Phillips Screws with Spring 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 with integrated spring lock washer that maintains clamping force under dynamic loads
- Enhanced corrosion protection through zinc-plated steel construction for extended service life in industrial environments
- High tensile strength of 60,000 PSI ensures reliable performance in demanding applications
- Excellent drive engagement with Phillips No. 3 drive for efficient installation and removal
- Precise thread fit with Class 2A UNC coarse threads for easy assembly and secure fastening
- Optimal load distribution through pan head design with 0.492" diameter for broader surface contact
- Full threading provides maximum grip length and holding power along the entire fastener
Professional Applications & Engineering Value
This zinc-plated steel Phillips pan head screw with integrated spring lock washer addresses critical industrial fastening challenges where vibration loosening compromises assembly integrity. The 1/4"-20 UNC coarse thread configuration combined with Class 2A thread fit ensures rapid installation while maintaining precise tolerances. Engineered with 60,000 PSI tensile strength and Rockwell B70 hardness, this fully threaded fastener delivers exceptional clamping force for machinery, equipment manufacturing, and structural applications. The zinc plating provides corrosion resistance, while the spring lock washer actively counters vibrational forces, making it ideal for automotive components, industrial machinery, and electrical enclosures where reliable, long-term fastening is paramount.
Specification Summary & Compliance
This 1/4"-20 x 1/2" screw features UNC coarse threads with Class 2A thread fit for standard industrial applications. Manufacturing and dimensional specifications strictly comply with ASME B18.13 standards, ensuring interchangeability and reliability. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, confirming its suitability for regulated industries and international markets.
