S-91465A251 3/4"-10 x 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
- Exceptional durability with Grade A steel construction that resists wear in demanding industrial environments
- Reliable coarse threading provides faster installation and superior grip in softer materials or where vibration resistance is critical
- Optimized strength-to-weight ratio with 60,000 psi tensile strength and Rockwell B69 hardness for dependable performance under load
- Secure external square drive delivers maximum torque transfer and prevents tool slippage during high-tension applications
- Precision Class 2A thread fit ensures consistent engagement and smooth assembly with standard UNC nuts
- Partial threading design concentrates strength where needed while reducing material weight and cost
- Environmental compliance with RoHS 3 standards for safe use across regulated industries and global markets
Professional Applications & Engineering Value
This heavy-duty square head screw delivers critical engineering solutions where standard fasteners fall short. The ASTM A307 Grade A steel construction provides the ideal balance of 60,000 psi tensile strength and machinability for structural connections, machinery assembly, and construction applications. The 3/4"-10 UNC coarse thread configuration ensures rapid installation in wood, castings, and structural steel while maintaining vibration resistance. The distinctive external square drive head design allows for high-torque applications where rounded hex heads would fail, making it indispensable for maintenance, repair, and heavy equipment applications requiring reliable, high-strength fastening solutions.
Specification Summary & Compliance
Manufactured to Unified Standard Class 2A thread tolerances for consistent fit with standard nuts. Complies with ASTM A307 specifications for low carbon steel fasteners and maintains RoHS 3 (2015/863/EU) compliance for restricted substance management. Thread specifications include 3/4"-10 UNC coarse thread with 1 3/4" minimum thread length and right-hand direction. Dimensional accuracy ensures proper engagement across industrial applications requiring 4" length fasteners with partially threaded design.
