S-94688A317 5/16"-18 x 1 1/2" 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 tensile strength with 150,000 psi rating for reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc yellow-chromate plating for extended service life in harsh environments
- Precision Class 3A thread fit ensures secure fastening and vibration resistance in demanding installations
- Heavy-duty SAE Grade 8 construction delivers maximum durability for industrial and machinery applications
- External square drive design allows for high-torque installation and easy removal with standard tools
- Coarse UNC threading provides quick assembly and superior holding power in various materials
- Full threading along the 1-1/2" length enables versatile positioning and maximum engagement strength
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these SAE Grade 8 square head screws provide critical solutions where vibration resistance and structural integrity are paramount. The 5/16"-18 UNC coarse thread configuration ensures rapid installation in machinery, construction equipment, and structural assemblies while maintaining superior pull-out resistance. The zinc yellow-chromate plating delivers exceptional corrosion protection in challenging environments, from manufacturing facilities to outdoor equipment. The external square drive design accommodates high-torque applications where stripping concerns limit hex head alternatives, making these steel fasteners ideal for maintenance, repair, and original equipment manufacturing requiring dependable, high-strength fastening solutions.
Specification Summary & Compliance
This square head screw features precision Unified Standard Class 3A thread fit with 5/16"-18 UNC coarse threading and right-hand thread direction. Manufactured from high-strength steel with zinc yellow-chromate plating finish, the fastener meets ASME B18.2.1 specifications and delivers 150,000 psi tensile strength consistent with SAE Grade 8 requirements. The 1-1/2" length features full threading for maximum versatility in industrial applications requiring high-performance fastening solutions.
