10.9 Metric fasteners, resembling inch fasteners in style and use, require careful identification to avoid mix-ups. They're measured in millimeters, with distinctive head markings. Yellow zinc plated fasteners have good corrosion resistant qualities and are a good choice for indoor and industrial applications. The 10.9 class, similar to SAE Grade 8, indicates alloy steel, quenched, and tempered steel fasteners with notable tensile strength, used across contractors, designers, OEMs, and maintenance staff for critical joints and high stress applications. Thread FT/PT: Full Thread; Threads Per Inc: 1.75; Thread Type: Coarse; Head Type: Hex; Product Base Material: Steel