S-91236A730 1/2"-13 x 4 1/2" 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
- Superior corrosion resistance with zinc plating that protects against rust in demanding industrial environments
- Exceptional tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
- Optimized thread engagement with UNC coarse threads providing faster assembly and reduced cross-threading risk
- Precise Class 2A thread fit guarantees consistent installation and secure fastening in standard clearance holes
- Enhanced durability with Rockwell B69 hardness maintaining structural integrity through repeated use
- Secure external hex drive enables high torque application with standard tools for efficient installation
- Regulatory compliance meets ASME B18.2.1 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These 1/2"-13 UNC hex head screws deliver critical performance advantages for heavy-duty industrial applications where fastener reliability is paramount. The zinc-plated steel construction provides essential corrosion protection for machinery, structural assemblies, and equipment exposed to harsh operating conditions. The coarse UNC thread profile ensures rapid installation while resisting vibration-induced loosening, making these fasteners ideal for construction, manufacturing, and maintenance applications. With partial threading optimizing grip length and 60,000 psi tensile strength, these screws maintain joint integrity under significant mechanical stress, reducing maintenance frequency and downtime in critical fastening systems.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 standards with Class 2A thread fit tolerance for consistent performance in standard applications. The UNC coarse thread (1/2"-13) provides optimal engagement in various materials. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use across industrial sectors. Mechanical properties include Rockwell B69 hardness and 60,000 psi tensile strength as specified in ASTM A307 requirements.
