S-91465A149 3/8"-16 x 2 1/2" ASTM A307 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
- Superior torque transmission through external square drive design for secure installation in high-torque applications
- Reliable strength performance with ASTM Grade A classification and 60,000 psi tensile strength for industrial demands
- Optimized thread engagement with UNC coarse threading that resists vibration loosening in machinery and equipment
- Precision thread fit meeting Unified Standard Class 2A specifications for consistent mating with nuts and threaded components
- Enhanced material durability featuring Rockwell B69 hardness to withstand mechanical stress and wear
- Versatile partial threading allowing unthreaded shank sections for shear strength in structural connections
- Environmental compliance assurance with RoHS 3 (2015/863/EU) certification for restricted substance control
Professional Applications & Engineering Value
This 3/8"-16 UNC Square Head Screw delivers exceptional engineering value through its ASTM A307 Grade A steel construction and coarse thread design. The combination of 60,000 psi tensile strength and Rockwell B69 hardness provides critical resistance against mechanical failure in heavy machinery, construction equipment, and industrial assembly applications. The external square drive enables high-torque installation without cam-out issues, while the partial threading offers superior clamping force distribution. These square head fasteners solve common industrial challenges including vibration-induced loosening, material fatigue, and installation efficiency, making them ideal for structural connections, machinery bases, and equipment maintenance where reliable fastening solutions are paramount.
Specification Summary & Compliance
This square head screw maintains Unified Standard Class 2A thread fit tolerances with 3/8"-16 UNC coarse threads and 1" minimum thread length. Manufactured to ASTM A307 specifications with 2 1/2" total length and right-hand threading. Compliant with RoHS 3 (2015/863/EU) environmental standards for hazardous substance restriction. The inch system measurement ensures compatibility with North American industrial standards and replacement part requirements.
