S-91375A554 1/4"-20 x 3" ASME B18.3, ASTM F912 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
- Exceptional holding strength with Class 3A thread fit for secure, vibration-resistant fastening in demanding applications.
- Superior corrosion resistance thanks to the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
- High durability and wear resistance from Rockwell C45 hardness, ensuring the screw maintains its integrity under heavy loads.
- Secure and tamper-resistant installation with a headless, hex drive design that allows for flush mounting and high torque application.
- Reliable grip and minimal surface damage from the cup tip, which concentrates force for excellent component retention.
- Wide compatibility and easy assembly with UNC coarse threads, enabling quick installation and robust performance.
- Compliance with major 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 solve critical challenges in industrial assembly and machinery. The UNC coarse thread and Class 3A fit provide high precision and superior clamping force, preventing loosening under vibration—common in motors, pulleys, and gear systems. The headless hex drive design allows for a clean, flush finish, ideal for space-constrained applications where protruding fasteners are not feasible. With a Rockwell C45 hardness and corrosion-resistant black-oxide surface treatment, it delivers long-term reliability in harsh conditions, reducing maintenance needs and downtime. This makes it a trusted choice for heavy-duty set screw applications across manufacturing, automotive, and machinery sectors.
Specification Summary & Compliance
This set screw features a 1/4"-20 UNC coarse thread with a Class 3A thread fit for precise, high-strength engagement. It is manufactured in accordance with ASME B18.3 specifications, ensuring dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental standards for global industrial use.
