S-91355A184 1/4"-28 x 1/4" Steel Flanged Button Head Hex-Drive Screws
Steel Flanged Button Head Hex-Drive 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 for extended service life in harsh industrial environments
- Precise Class 3A thread fit ensures secure, vibration-resistant connections in critical applications
- High tensile strength (120,000 psi) provides exceptional load-bearing capacity for demanding mechanical assemblies
- Flanged design with wide rounded head eliminates need for separate washers and distributes clamping force evenly
- Rockwell C32 hardness maintains structural integrity under repeated stress and torque applications
- Hex drive compatibility (5/32") enables quick installation with standard tools while preventing cam-out
- UNF fine threading delivers superior holding power compared to coarse threads in precision equipment
Professional Applications & Engineering Value
These black-oxide alloy steel rounded head screws with Class 3A UNF fine threads are engineered for precision assemblies where vibration resistance and reliable clamping force are critical. The flanged button head design provides superior bearing surface distribution, making them ideal for automotive components, industrial machinery, and electronic enclosures requiring flush mounting. The combination of 120,000 psi tensile strength and Rockwell C32 hardness ensures these fully threaded fasteners maintain integrity in high-stress applications, while the black-oxide surface treatment offers enhanced corrosion protection without compromising dimensional accuracy. The 5/32" hex drive facilitates efficient installation in confined spaces common in manufacturing and maintenance operations.
Specification Summary & Compliance
Manufactured to precise UNF 1/4"-28 thread specifications with Class 3A thread fit for superior engagement and vibration resistance. Features include right-hand threading, 0.563" flange diameter, and 1/4" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
