S-91266A716 1/2"-13 x 1 1/2" ASTM F835 Alloy Steel Thread-Locking Hex Drive Flat Head Screws
Alloy Steel Thread-Locking Hex Drive Flat 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
- Vibration-resistant locking with nylon patch thread locker maintains secure fastening in temperatures from -65° to 250° F
- Exceptional tensile strength of 130,000 psi provides reliable performance in high-stress industrial applications
- Precise Class 3A thread fit ensures smooth installation and superior engagement in demanding environments
- Corrosion-resistant black-oxide coating on alloy steel extends service life in challenging operating conditions
- Standard 82° countersink angle enables flush mounting for clean, professional finishes
- Heavy-duty hex drive (5/16") allows for high-torque installation without cam-out issues
- Fully threaded UNC coarse spacing delivers faster assembly and improved holding power
Professional Applications & Engineering Value
This black-oxide alloy steel flat head hex screw addresses critical industrial fastening challenges where vibration resistance, high tensile strength, and reliable performance are paramount. The nylon patch thread locking feature prevents loosening under dynamic loads, making it ideal for machinery, heavy equipment, and structural applications subject to constant stress. The UNC coarse thread configuration provides superior pull-out resistance in softer materials while the 82° countersink creates seamless surface integration. Engineered for industrial environments, this Class 3A thread fit screw ensures precise tolerances and consistent performance in manufacturing, construction, and maintenance operations where fastener integrity cannot be compromised.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerances with UNC coarse spacing (1/2"-13), this flat head hex screw meets ASTM F835 specifications for mechanical properties and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors. The black-oxide surface treatment on alloy steel provides additional corrosion protection while maintaining the 130,000 psi tensile strength and Rockwell C39 hardness required for demanding applications.
