A one-piece hex washer head bolt with a flat bearing surface, made of high-alloy steel. Class 10.9 frame bolts are often used on truck 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.
Has greater tensile strength than Class 8.8 bolts. Metric Class 10.9 bolts are most comparable to U.S. Grade 8 cap screws.
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