S-91465A176 1/2"-13 x 3" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• High torque application capability with external square drive for secure, slip-resistant tightening in demanding environments
• Reliable performance in low-strength applications through ASTM Grade A steel construction with 60,000 psi tensile strength
• Quick installation and removal with coarse UNC threads that resist cross-threading and enable faster assembly
• Precise thread engagement ensured by Unified Standard Class 2A fit for consistent performance across industrial applications
• Versatile partial threading design allowing both clamping and alignment functions in construction and mechanical assemblies
• Environmental compliance assurance with RoHS 3 (2015/863/EU) compliance for use in regulated industries
• Durable surface hardness with Rockwell B69 rating providing resistance to wear during repeated installations

Professional Applications & Engineering Value

This 1/2"-13 UNC square head screw delivers exceptional value in industrial fastening applications where reliable clamping force and easy maintenance access are critical. The ASTM A307 Grade A steel construction provides optimal strength-to-weight ratio for structural connections in construction frameworks, machinery bases, and equipment assemblies. The coarse thread pattern ensures rapid installation while resisting vibration-induced loosening, making it ideal for agricultural equipment, conveyor systems, and temporary structural supports. The external square drive design allows for high-torque application with standard tools, preventing cam-out issues common in Phillips or slotted drives. With partial threading, this fastener efficiently bridges gap variations while maintaining alignment precision in mechanical joints and structural steel connections.

Specification Summary & Compliance

This square head screw maintains Unified Standard Class 2A thread tolerances for consistent fit across industrial applications. Manufactured to ASTM A307 specifications for low-carbon steel fasteners, it delivers reliable performance in non-critical structural applications. The inch-system measurement ensures compatibility with North American machinery and equipment standards. Compliant with RoHS 3 (2015/863/EU) regulations, this fastener meets environmental requirements for hazardous substance restrictions. Thread specifications include 1/2"-13 UNC coarse thread with right-hand direction and minimum 1-1/4" thread length, providing optimal engagement for most industrial fastening scenarios.