S-91255A055 1/2"-20 x 1 1/2" ASTM F835 Steel Button Head Hex-Drive Screws
Steel 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 finish protects against rust and extends service life in harsh industrial environments.
- Exceptional tensile strength of 120,000 PSI ensures reliable performance under high-stress conditions without failure.
- Precision Class 3A fine threading provides tighter fit and superior vibration resistance compared to standard threads.
- Easy installation and removal with 5/16" hex drive design allows for high-torque application using common tools.
- Full compliance with industry standards including ASME B18.3 and ASTM F835 guarantees consistent quality and interchangeability.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance meets strict regulatory requirements.
- Versatile rounded button head design offers a low-profile finish that reduces snagging while maintaining structural integrity.
Professional Applications & Engineering Value
These black-oxide alloy steel rounded head screws deliver critical performance advantages in demanding applications where corrosion resistance and high tensile strength are paramount. The Class 3A UNF fine threading provides superior clamping force and vibration resistance in precision assemblies, machinery, and equipment subjected to dynamic loads. The combination of Rockwell C39 hardness and 120,000 PSI tensile strength ensures these fully threaded screws maintain integrity in high-stress environments while the 5/16" hex drive facilitates efficient installation in confined spaces. Ideal for automotive, aerospace, and heavy equipment applications requiring reliable fastening solutions that meet rigorous industry specifications.
Specification Summary & Compliance
Manufactured to precise Class 3A thread fit tolerances with 1/2"-20 UNF fine threading and 1 1/2" length. Complies with ASME B18.3 and ASTM F835 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. The black-oxide alloy steel construction provides consistent performance across industrial applications.
