S-91385A533 1/4"-20 x 1/4" 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 vibration resistance through the integrated nylon patch thread locker, preventing loosening in high-stress environments
- Superior corrosion protection with the black-oxide finish on alloy steel, extending service life in demanding industrial conditions
- High-strength performance backed by Rockwell C45 hardness, ensuring reliable clamping force and durability
- Wide temperature tolerance from -50°F to 250°F, maintaining locking integrity in extreme thermal applications
- Precise thread engagement with UNC Class 3A fit, providing secure fastening and reduced risk of cross-threading
- Easy installation and removal using the 1/8" hex drive, allowing for efficient assembly in confined spaces
- Secure component positioning with the cup tip design, minimizing surface damage while ensuring firm grip
Professional Applications & Engineering Value
This 1/4"-20 UNC Class 3A set screw is engineered to address critical challenges in industrial assembly, where vibration-induced loosening and thermal cycling compromise fastener integrity. The black-oxide alloy steel construction provides robust resistance to wear and environmental factors, while the nylon patch thread locker actively counters rotational forces without requiring additional adhesives. Its headless design and hex drive facilitate seamless integration into machinery, shafts, and precision equipment, ensuring components remain securely aligned under dynamic loads. Ideal for automotive, aerospace, and heavy machinery applications, this set screw delivers consistent holding power and reduces maintenance intervals, enhancing overall operational reliability.
Specification Summary & Compliance
This set screw adheres to UNC coarse thread standards with a Class 3A thread fit for precise dimensional accuracy. It conforms to ASME B18.3 manufacturing specifications and is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental and safety regulations are met for global industrial use.
