S-91236A587 5/16"-18 x 1 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, extending service life in demanding industrial environments
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
- Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
- Class 2A thread fit with UNC coarse threading offers easier assembly and reduced risk of cross-threading
- External hex drive design allows for high-torque installation with standard tools, speeding up assembly processes
- Partial threading provides unthreaded shank for precise clamping and shear strength in structural applications
- Compliance with ASME B18.2.1, RoHS 3, and REACH ensures quality, safety, and environmental responsibility
Professional Applications & Engineering Value
This 5/16"-18 UNC hex head screw delivers exceptional engineering value in industrial fastening applications where reliability is critical. The steel construction with zinc plating combats corrosion in harsh environments, from manufacturing equipment to outdoor structures. Its coarse UNC threading and Class 2A thread fit enable quick, secure installation even in materials prone to stripping. The partially threaded design concentrates clamping force where needed, preventing joint loosening under dynamic loads. With 60,000 psi tensile strength and Rockwell B69 hardness, it withstands heavy-duty mechanical stresses in machinery assembly, construction frameworks, and automotive components, ensuring long-term operational integrity.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 specifications with Class 2A thread fit for consistent dimensional accuracy. Features 5/16"-18 UNC coarse threads with right-hand direction and 1-1/2" length (minimum thread length 7/8"). Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting ASTM A307 grade requirements for reliable industrial use.
