S-91253A012 10-32 x 1 1/4" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi provides reliable fastening under high-stress conditions, reducing failure risks in critical assemblies.
• Precision Class 3A thread fit ensures tight, secure connections with minimal backlash, enhancing assembly accuracy and vibration resistance.
• Black-oxide finish on alloy steel offers superior corrosion resistance and a professional appearance, extending service life in harsh environments.
• Fully threaded design allows for maximum grip along the entire length, improving load distribution and pull-out strength.
• 82° countersink angle and flat head enable flush mounting for streamlined surfaces, preventing snagging and meeting aesthetic requirements.
• Hex drive compatibility with 1/8" tools facilitates easy installation and removal, saving time during maintenance and repairs.
• Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interoperability, ensuring fit with standardized components.

Professional Applications & Engineering Value

These 10-32 UNF flat head screws are engineered to address common industrial challenges, such as vibration-induced loosening and corrosion in demanding settings. Made from black-oxide alloy steel, they combine high Rockwell C39 hardness with fine threading to maintain integrity in machinery, automotive, and electronics assemblies. The fully threaded Class 3A fit ensures precise engagement, reducing the need for re-tightening and minimizing downtime. Ideal for applications requiring flush mounting with an 82° countersink, these screws provide a secure, low-profile solution that enhances safety and durability in high-tensile environments, from production lines to outdoor equipment.

Specification Summary & Compliance

This screw features a 10-32 UNF fine thread with Class 3A tolerance for exact fit, a length of 1-1/4", and a right-hand thread direction. It meets ASME B18.3 and ASTM F835 specifications for dimensional accuracy and performance. Additionally, it is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to environmental and safety regulations without compromising on reliability.