S-90289A351 1/4"-28 x 1/4" 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
- Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Exceptional holding power through serrated locking design that prevents component slippage under vibration
- Precision Class 3A thread fit ensures tight tolerances and reliable fastening in critical assemblies
- High-strength performance with Rockwell C45 hardness rating for maximum durability under load
- Space-saving headless design allows flush mounting where clearance is limited
- Easy installation and removal with standardized 1/8" hex drive compatibility
- Cup tip configuration provides concentrated contact pressure for secure component positioning
Professional Applications & Engineering Value
Engineered for precision industrial applications, this black-oxide alloy steel set screw delivers exceptional performance in machinery, automotive, and manufacturing equipment. The Class 3A UNF fine threads maintain precise alignment in assemblies subject to vibration, while the serrations locking mechanism prevents rotational loosening in dynamic environments. The headless hex drive design enables installation in confined spaces where traditional fasteners cannot operate. With Rockwell C45 hardness, this fastener withstands repeated torque applications without deformation, making it ideal for permanent positioning applications requiring reliable, long-term performance in demanding conditions.
Specification Summary & Compliance
This set screw features 1/4"-28 UNF fine threads with Class 3A precision tolerance for exacting fit requirements. Manufactured to ASME B18.3 specifications for dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations, ensuring safe use in industrial applications worldwide. The inch system measurement and right-hand thread direction follow industry-standard conventions for seamless integration into existing assemblies.
