S-91381A540 1/4"-20 x 3/4" 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
- Secure Component Locking: Brass tip provides excellent grip without damaging mating surfaces, ideal for repeated adjustments.
- High Durability & Corrosion Resistance: Black-oxide finish on alloy steel enhances longevity in demanding industrial environments.
- Precise Thread Engagement: Class 3A thread fit ensures tight, reliable fastening with minimal backlash.
- Easy Installation in Confined Spaces: Headless design with 1/8" hex drive allows tool access where clearance is limited.
- Consistent Performance Under Load: Rockwell C28 hardness and UNC coarse threads deliver reliable strength for high-vibration applications.
- Broad Industrial Compliance: Meets ASME B18.3 specifications and environmental standards (RoHS 3, REACH) for global supply chain use.
- Optimized for Right-Hand Assembly: Standard thread direction simplifies installation in conventional machinery and equipment.
Professional Applications & Engineering Value
Engineered for precision fastening in industrial machinery, automotive assemblies, and motion control systems, this black-oxide alloy steel set screw addresses common challenges like component slippage and thread wear. The UNC coarse thread with Class 3A fit ensures rapid installation and vibration resistance, while the soft brass tip prevents marring of shafts or gears—critical in applications requiring frequent repositioning. Its headless, hex drive design facilitates use in compact spaces, and the Rockwell C28 hardness provides enduring performance under mechanical stress, making it a reliable choice for engineers prioritizing durability and compliance with ASME B18.3 standards.
Specification Summary & Compliance
This set screw adheres to Class 3A thread tolerances for inch-series fasteners, with UNC coarse threads (1/4"-20) and a length of 3/4". Manufacturing and quality are governed by ASME B18.3, and the product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for international industrial markets.
