S-91255A276 10-32 x 1 3/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi provides superior resistance to mechanical stress and load failures in demanding applications.
• Class 3A thread fit ensures precise, reliable engagement with mating parts, reducing the risk of cross-threading and assembly errors.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance and a durable, wear-resistant surface for extended service life.
• Partially threaded design allows for controlled clamping force and secure fastening without unnecessary thread engagement.
• Rockwell C39 hardness maintains structural integrity under high-stress conditions, preventing deformation and stripping.
• Hex drive (1/8") with rounded button head facilitates easy installation and a low-profile, snag-resistant finish for streamlined assemblies.
• Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality, dimensional accuracy, and interoperability with standardized components.

Professional Applications & Engineering Value

These 10-32 UNF screws with fine thread spacing and black-oxide alloy steel construction are engineered to address critical challenges in industrial settings, such as vibration-induced loosening and environmental wear. The rounded button head and partial threading provide optimal clamping in machinery, electronics, and automotive assemblies, where precise torque control and space efficiency are paramount. By combining high tensile strength with a Class 3A thread fit, these screws deliver reliable performance in high-stress applications, reducing maintenance downtime and ensuring long-term operational safety. Ideal for use in enclosures, brackets, and precision equipment, they meet rigorous standards for durability and compatibility.

Specification Summary & Compliance

This screw adheres to Class 3A thread tolerance per UNF standards, with a length of 1 3/4" and minimum thread length of 7/8". It conforms to ASME B18.3 and ASTM F835 specifications for dimensional consistency and mechanical properties. The product is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets environmental and safety regulations for hazardous substance restrictions.