S-92327A111 1/4"-20 x 3" ASME B18.2.1, SAE J429 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 tensile strength of 120,000 psi provides reliable performance in demanding applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh or outdoor environments.
- Precise Class 3A thread fit ensures consistent engagement and vibration resistance, maintaining joint integrity.
- Coarse UNC threading allows for faster installation and easier alignment in various materials.
- External square drive design offers high torque transmission and reduces slipping during tightening.
- SAE Grade 5 medium strength rating balances durability and cost-effectiveness for general industrial use.
- Full threading along the 3" length provides maximum grip and adjustability in assembled components.
Professional Applications & Engineering Value
These SAE Grade 5 square head screws are engineered to address common industrial challenges such as joint loosening under vibration and corrosion-induced degradation. The zinc yellow-chromate plated steel construction offers a robust barrier against moisture and chemicals, making them ideal for construction, machinery assembly, and outdoor equipment. The coarse UNC thread and external square drive facilitate quick installation with standard tools, reducing labor time while the Class 3A thread fit ensures precise, secure fastening in heavy-duty applications. This combination of material strength and design precision delivers long-term reliability in medium-strength fastening scenarios.
Specification Summary & Compliance
This product adheres to Unified Standard Class 3A thread fit and UNC coarse thread specifications with a diameter of 0.25" and length of 3". It conforms to ASME B18.2.1 and SAE J429 standards, ensuring dimensional accuracy and performance consistency. The screw is fully threaded and meets common industry requirements for material and mechanical properties, including a tensile strength of 120,000 psi and Rockwell C25 hardness, supporting compliance in regulated industrial environments.
