S-90403A079 2-56 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 corrosion resistance with zinc-plated steel construction, ensuring long-lasting performance in harsh industrial environments.
- Enhanced vibration resistance thanks to the internal-tooth lock washer, which prevents loosening under dynamic loads.
- High tensile strength of 60,000 psi provides reliable fastening for demanding applications without failure.
- Easy installation and removal with a No. 1 Phillips drive and rounded pan head design, reducing assembly time and tool wear.
- Consistent thread engagement due to Class 2A thread fit and coarse UNC threading, offering secure holds in various materials.
- Full threading along the 1/4" length maximizes grip and distribution of clamping force for sturdy connections.
- Compliance with industry standards including ASME B18.13, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
This 2-56 UNC zinc-plated steel rounded head screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in machinery and equipment. The combination of a Phillips drive and internal-tooth lock washer ensures quick, secure installations that withstand dynamic stresses in automotive, electronics, and assembly line settings. With a coarse thread spacing and fully threaded design, it delivers superior holding power in softer materials or where frequent disassembly isn't required. The zinc-plated finish adds a protective layer against moisture and chemicals, extending service life and reducing maintenance costs, making it ideal for industrial screws used in high-stress environments.
Specification Summary & Compliance
This screw features precise Class 2A thread fit and adheres to UNC thread standards for consistent performance. It meets ASME B18.13 manufacturing specifications, ensuring dimensional accuracy and reliability. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial applications.
