Description
The 1-1/4"-7 Socket Head Cap Screw is an extreme-duty industrial fastener engineered for the highest-load, highest-torque applications where strength, structural stability, and compact head design are essential. With a cylindrical socket head and internal hex drive, this fastener delivers outstanding torque transmission, precision alignment, and clamping performance—ideal for critical infrastructure and massive mechanical assemblies.
Specifications
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Thread Size: 1-1/4"-7 (Unified National Coarse)
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Head Type: Cylindrical socket head with internal hex drive
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Drive Type: Hex socket (Allen)
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Length: Available in extended standard lengths (typically from 2" to 12"+)
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Material: High-strength alloy steel; also available in stainless steel, black oxide, or zinc-plated finishes
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Finish Options: Black oxide, plain, zinc-plated, or stainless
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Grade: Typically Grade 8 (hardened alloy steel) or 18-8 / 316 stainless steel for corrosion resistance
Key Features
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Extreme Load-Bearing Power: The large 1-1/4" diameter and coarse 7 TPI thread deliver massive tensile and shear strength for industrial-scale structural integrity.
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Precision Machining: Threads are cut to UNC specifications to ensure tight, vibration-resistant engagement with tapped holes or heavy-duty nuts.
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High Torque with Compact Form: The internal hex drive enables strong torque application in confined spaces without compromising on fastener strength.
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Flush-Mount Capability: The low-profile cylindrical socket head allows use in counterbored or flush applications where clearance is limited.
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Environment-Resistant Finishes: Stainless steel and coated options provide long-term performance in wet, corrosive, or marine-grade conditions.
Typical Applications
The 1-1/4"-7 Socket Head Cap Screw is engineered for ultra-heavy-duty and mission-critical applications, including:
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Steel Bridge and Highway Structural Connections
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Wind Turbines, Tower, and Infrastructure Bases
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Mining Equipment and Excavation Machinery
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Large-Scale Industrial Machines and Frames
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Offshore Drilling Rigs and Marine Construction
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Military Vehicle Chassis and High-Impact Ground Systems
