S-91465A143 3/8"-16 x 1 3/4" 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
- Enhanced torque transmission with external square drive design for secure installation in high-vibration environments
- Superior material durability through Grade A steel construction with Rockwell B69 hardness for long service life
- Reliable coarse threading (UNC 3/8"-16) ensures quick assembly and reduced cross-threading risks in industrial applications
- Optimized strength-to-weight ratio with 60,000 PSI tensile strength meeting ASTM A307 specifications for structural integrity
- Precision thread fit with Unified Standard Class 2A tolerance for consistent performance in mating components
- Environmental compliance assurance through RoHS 3 (2015/863/EU) certification for restricted substance control
- Versatile partial threading allows both clamping and alignment functions in machinery assembly
Professional Applications & Engineering Value
This 3/8"-16 UNC square head screw delivers critical engineering solutions where high torque requirements meet demanding environmental conditions. The ASTM Grade A steel construction provides optimal strength for heavy machinery, construction equipment, and structural frameworks while maintaining cost-efficiency. The coarse thread profile and Class 2A thread fit ensure rapid installation in field applications where precision tools may be limited. The external square drive design prevents cam-out during high-torque applications, making it ideal for maintenance operations and equipment requiring periodic disassembly. With partial threading, it offers superior clamping force distribution while allowing unthreaded shank sections to function as precision dowels in aligned components.
Specification Summary & Compliance
Manufactured to Unified Standard Class 2A thread tolerances with 3/8"-16 UNC coarse threads and 1" minimum thread length. Complies with ASTM A307 specifications for Grade A fasteners, delivering 60,000 PSI tensile strength and Rockwell B69 hardness. Meets RoHS 3 (2015/863/EU) compliance standards for hazardous substance restriction. Dimensions include 1 3/4" length with 9/16" head width and 1/4" head height for standardized wrench compatibility.
