S-91381A353 1/4"-28 x 3/8" ASME B18.3 Set Screws
Set Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide coating on alloy steel, extending service life in demanding industrial environments.
- Enhanced component protection from the brass soft tip, preventing damage to delicate surfaces during secure fastening.
- Maximum holding power and vibration resistance achieved through Class 3A fine UNF threads for reliable, long-term assemblies.
- High-strength performance with Rockwell C28 hardness, ensuring durability under mechanical stress.
- Easy installation in confined spaces thanks to the headless design and 1/8" hex drive for straightforward tool access.
- Precise fit and reduced loosening from the right-hand fine thread design, maintaining alignment in precision applications.
- Compliance with rigorous industry standards including ASME B18.3, ensuring consistent quality and reliability.
Professional Applications & Engineering Value
This black-oxide alloy steel set screw is engineered to address critical challenges in precision assemblies, such as vibration-induced loosening and component marring. The Class 3A UNF fine threads provide a tighter fit and superior clamping force, essential for high-stress applications in machinery, automotive, and aerospace sectors. The inclusion of a brass soft tip protects sensitive surfaces from scratches and deformation, making it ideal for securing gears, pulleys, and shafts without compromising integrity. Its headless design and hex drive facilitate installation in tight spaces, enhancing efficiency in complex industrial setups while maintaining ASME B18.3 compliance for dependable performance.
Specification Summary & Compliance
This set screw adheres to Class 3A thread fit for precise dimensional accuracy and superior engagement, with a 1/4"-28 UNF fine thread and right-hand direction. It meets ASME B18.3 manufacturing specifications and is certified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for global industrial use.
