S-91309A554 1/4"-20 x 3" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength Steel Hex 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 – Withstands up to 60,000 psi for reliable performance in demanding applications.
- Corrosion-Resistant Zinc Plating – Extends service life by protecting against rust and environmental damage.
- Precision UNC Coarse Threading – Ensures quick installation and secure fastening with Class 2A fit for consistent engagement.
- Full Thread Design – Provides maximum grip and load distribution along the entire 3" length.
- Durable Steel Construction – Offers Rockwell B69 hardness for excellent wear resistance and structural integrity.
- Standard-Compliant Engineering – Manufactured to ASME B18.2.1/ASTM A307, ensuring compatibility and reliability.
- Environmental Compliance – Meets RoHS 3 and REACH standards for safe, sustainable industrial use.
Professional Applications & Engineering Value
These 1/4"-20 x 3" steel hex head screws are engineered to address critical industrial fastening challenges, such as vibration loosening and material fatigue. The UNC coarse threading and Class 2A fit facilitate rapid assembly while maintaining tight tolerances, reducing installation time in machinery, structural frameworks, and heavy equipment. The zinc plating provides a protective barrier against moisture and chemicals, ideal for outdoor or harsh environments. Fully threaded along the 3" length, they ensure uniform stress distribution, preventing joint failure in high-load scenarios. Compliant with ASME B18.2.1 and ASTM A307, these screws deliver consistent performance for construction, automotive, and manufacturing sectors, enhancing operational efficiency and safety.
Specification Summary & Compliance
This product features precise UNC coarse threading with a Class 2A fit for standard tolerance, ensuring reliable engagement. It adheres to ASME B18.2.1 and ASTM A307 manufacturing specifications, guaranteeing dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety standards for industrial use.
