S-91381A664 1/2"-13 x 1/2" ASME B18.3 Set Screws
Set 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
- Enhanced corrosion resistance with black-oxide coating for reliable performance in demanding industrial environments
- Precision Class 3A thread fit ensures tight, secure fastening with minimal vibration loosening in critical applications
- Brass soft tip design prevents surface damage to components while maintaining excellent holding power
- Rockwell C28 hardness rating provides superior durability and long service life under heavy loads
- 1/4" hex drive configuration offers excellent torque transmission and easy installation in confined spaces
- Headless construction allows for flush mounting where protruding fasteners are not feasible
- Coarse UNC threading enables quick assembly and disassembly while resisting cross-threading
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers exceptional engineering value in applications requiring secure positioning of components on shafts, collars, and pulleys. The 1/2"-13 UNC Class 3A threads provide precise fitment in machinery, automotive, and industrial equipment where vibration resistance is critical. The innovative brass soft tip eliminates marring of expensive shafts and precision components while maintaining firm contact pressure. The headless design with 1/4" hex drive solves space constraints in compact assemblies, making it ideal for motor mounts, gear assemblies, and rotating equipment where flush mounting is essential. The combination of Rockwell C28 hardness and corrosion-resistant black-oxide treatment ensures reliable performance in harsh operating conditions.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 standards with precision Class 3A thread fit for superior dimensional accuracy. Features 1/2"-13 UNC coarse threads with right-hand orientation and 1/2" length specification. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The black-oxide alloy steel construction meets industrial requirements for strength and corrosion resistance in demanding fastener applications.
