Product Name
Square Drive Pan Head Self Drilling Screws
Details Information
Introduction
Crafted from premium SCM435 alloy steel and compliant with DIN 6921 international standards, this Grade 12.9 fine thread hex head flange bolt delivers exceptional mechanical performance for high-stress connections . Undergoing precision quenching and tempering heat treatment, it achieves a minimum tensile strength of 1220MPa and a hardness range of 39-44HRC, ensuring superior load-bearing capacity and resistance to shear and vibration .
Features
Black or Plain finish is unfinished (bare steel) has no actual protective coating. There may be an oil residue which provides some shelf life but no real corrosion protection when in use. The term “black” is an old industry term for plain. Depending on the material grade and heat treatment process the colour can vary from a shiny oily finish to a dull black
Applications
Primary use for bolt is on truck cassis frames. The flange eliminates the need for a flat washer and helps compensate for a misaligned hole. When used with a proper class flange nut, the bolt system resists bolt slippage by distributing the clamp load over a wide area.
For use in low-strength applications where resistance to environmental corrosion is a primary concern.
Parameters
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