S-94688A311 1/4"-20 x 1" ASME B18.2.1 Square Head Screws
Square Head 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
- Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress environments.
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh conditions.
- High-precision threading with Unified Standard Class 3A fit ensures secure, vibration-resistant connections.
- Optimized for heavy-duty applications thanks to SAE Grade 8 classification and coarse UNC thread design.
- Easy installation and removal with external square drive head, compatible with standard industrial tools.
- Full-thread engagement along the 1" length for maximum grip and distribution of clamping force.
- Compliance with ASME B18.2.1 guarantees consistent quality and interchangeability in professional settings.
Professional Applications & Engineering Value
This 1/4"-20 UNC square head screw is engineered to address critical challenges in industrial assembly, such as joint integrity under dynamic loads and environmental degradation. The SAE Grade 8 steel construction, combined with coarse threading, provides excellent resistance to loosening in vibrating machinery, construction equipment, and automotive systems. The zinc yellow-chromate plating offers a robust barrier against rust and chemical exposure, making it ideal for outdoor or humid environments. Its external square drive allows for high-torque application without cam-out, ensuring efficient installation in confined spaces. By meeting ASME B18.2.1 standards, this fastener delivers predictable performance, reducing downtime and maintenance costs in heavy-duty fastening applications.
Specification Summary & Compliance
This product adheres to Unified Standard Class 3A thread fit for precise dimensional accuracy and is manufactured in compliance with ASME B18.2.1 specifications. The coarse UNC thread (1/4"-20) and fully threaded 1" length ensure consistent engagement. It meets common industry regulations for material and finish, including RoHS and REACH, supporting safe and sustainable use in global markets.
