S-91255A004 4-48 x 3/8" 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
- Exceptional tensile strength of 120,000 psi provides reliable performance in high-stress applications, reducing the risk of fastener failure.
- Precision Class 3A thread fit ensures smooth installation and secure fastening, minimizing assembly errors and rework.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for long-term use.
- Rockwell C39 hardness delivers superior wear resistance, maintaining thread integrity through repeated use and vibration.
- Fully threaded UNF fine thread design allows for maximum grip and load distribution in thin materials or precision assemblies.
- Hex drive (1/16") with rounded button head enables easy installation in confined spaces while providing a low-profile, aesthetically pleasing finish.
- Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interchangeability in industrial and engineering applications.
Professional Applications & Engineering Value
This 4-48 UNF fine thread rounded button head screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. The black-oxide alloy steel construction, combined with a Rockwell C39 hardness rating, ensures durability in demanding environments like machinery, automotive assemblies, and electronic enclosures. The fully threaded right-hand design with Class 3A fit provides precise alignment and secure fastening, reducing the need for maintenance. Ideal for applications requiring high tensile strength and fine thread engagement, this screw offers reliable performance in precision equipment and heavy-duty fastening scenarios where compliance with industry standards is critical.
Specification Summary & Compliance
This screw features a 4-48 UNF fine thread with Class 3A fit for high precision, a length of 3/8", and a head diameter of 0.213". It meets ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in industrial use.
