S-91249A528 1/4"-20 x 1/4" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws
Stainless Steel Pan Head Phillips Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments and extending service life.
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and mechanical stress.
- Rockwell B70 hardness provides excellent durability and resistance to wear and deformation.
- Class 2A thread fit with UNC coarse threads allows for quick assembly and secure fastening in various materials.
- Fully threaded design offers maximum grip and uniform load distribution along the entire length.
- Phillips drive (No. 3) enables efficient installation with common tools, reducing assembly time and effort.
- Compliance with ASME B18.6.3, RoHS 3, and REACH ensures quality, safety, and environmental standards for global applications.
Professional Applications & Engineering Value
These 1/4"-20 UNC Rounded Head Screws are engineered to address common industrial challenges, such as corrosion in humid or chemical-exposed settings. The Black-Oxide 18-8 Stainless Steel construction provides a robust barrier against rust and oxidation, while the coarse UNC threads and Class 2A fit ensure easy installation and reliable hold in metals, plastics, and wood. With a pan head style and Phillips drive, they offer a low-profile, secure fastening solution for machinery, automotive assemblies, and electrical enclosures, minimizing the risk of loosening under vibration. Their fully threaded design enhances load-bearing capacity, making them ideal for heavy-duty applications where consistent performance and longevity are critical.
Specification Summary & Compliance
This screw features precise dimensions, including a thread size of 1/4"-20 UNC with Class 2A thread fit for standard tolerance, a head diameter of 0.492", and a length of 1/4". It is manufactured in accordance with ASME B18.6.3 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard quality for professional use.
