S-91355A187 1/4"-28 x 1" Steel Flanged Button Head Hex-Drive Screws
Steel Flanged Button Head Hex-Drive 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, extending service life in demanding industrial environments
- Exceptional load-bearing capacity from 120,000 psi tensile strength, preventing fastener failure under high stress
- Precision fine threading (UNF Class 3A) ensures secure, vibration-resistant connections in critical assemblies
- Enhanced installation efficiency with 5/32" hex drive and flanged design, eliminating need for separate washers
- Full thread engagement along the 1" length provides maximum grip strength and distribution of clamping forces
- Consistent performance maintained through Rockwell C32 hardness, resisting wear and deformation
- Regulatory compliance assurance with RoHS 3 and REACH standards, meeting international environmental directives
Professional Applications & Engineering Value
Engineered for precision assemblies requiring reliable fastening under dynamic loads, this black-oxide alloy steel rounded head screw combines Class 3A UNF fine threading with a flanged button head design to solve common industrial challenges. The fully threaded 1" length ensures maximum thread contact in thin materials and deep tapped holes, while the 120,000 psi tensile strength prevents shear failure in high-vibration applications like machinery frames, automotive components, and electrical enclosures. The 5/32" hex drive facilitates quick installation with standard tools, and the black-oxide surface treatment provides essential corrosion protection without compromising dimensional accuracy, making it ideal for OEM production lines and maintenance operations where durability and compliance are critical.
Specification Summary & Compliance
This precision fastener maintains Class 3A thread fit per UNF standards with 1/4"-28 fine threading and fully threaded construction. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring hazardous substance restrictions are met. The alloy steel composition achieves consistent Rockwell C32 hardness and 120,000 psi tensile strength, with dimensional controls including 0.563" flange diameter and 0.132" head height for reliable mating with standard components.
