S-91465A158 1/2"-13 x 1" 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 with external square drive design for secure installation and removal in demanding applications
- Reliable mechanical performance from ASTM Grade A steel construction with 60,000 PSI tensile strength
- Optimized thread engagement through UNC coarse threading that resists cross-threading and speeds assembly
- Precision manufacturing with Unified Standard Class 2A thread fit ensuring consistent mating with nuts and tapped holes
- Full-length threading provides maximum grip and load distribution across the entire fastener length
- Enhanced durability with Rockwell B69 hardness rating for excellent wear resistance in industrial environments
- Environmental compliance meeting RoHS 3 standards for restricted substance control in global markets
Professional Applications & Engineering Value
This 1/2"-13 UNC square head screw delivers exceptional value in heavy machinery, structural steel connections, and industrial equipment assembly. The ASTM Grade A steel construction provides dependable strength for moderate stress applications, while the coarse UNC threading prevents binding in softer materials and contaminated environments. The external square drive design offers superior torque transmission compared to standard hex heads, reducing tool slippage during high-torque applications. Fully threaded along its 1" length, this fastener ensures maximum engagement in thick materials and provides consistent clamping force across joints. Manufactured to ASTM A307 specifications, these screws meet rigorous industrial standards for construction and maintenance applications where reliability is paramount.
Specification Summary & Compliance
This square head screw features Unified Standard Class 2A thread fit with 1/2"-13 UNC coarse threading in right-hand direction. Manufactured from ASTM Grade A steel with Rockwell B69 hardness and 60,000 PSI tensile strength rating. Complies with ASTM A307 specifications for low carbon steel fasteners and meets RoHS 3 (2015/863/EU) environmental standards. Dimensions include 1" length, 3/4" head width, and 21/64" head height in inch system measurements.
