Hex Head Bolt 8.8 10.9 12.9 Grade, DIN931 DIN933, Carbon Steel, Black Oxide

<h2>Product Introduction</h2>
<p>High‑strength hex head bolts are manufactured from premium carbon steel and alloy steel, available in property classes 8.8, 10.9 and 12.9. Produced in strict compliance with DIN 931 standards, these hex bolts deliver outstanding mechanical performance and reliable load‑bearing capacity, widely adopted for heavy‑duty mechanical, steel‑structure and engineering connection projects. Custom specifications and special material options including <strong>45# steel, 35K</strong> are available upon customer request.</p>

<h3>Standards & Dimensions</h3>
<p>Conforms to DIN 931, DIN 933, ISO 4014, ISO 4017; also equivalent to GB/T5782, GB/T5783. Thread sizes range from M1.6 to M39, custom lengths are supported.</p>

<h3>Material & Grade</h3>
<ul>
<li>Carbon Steel / Alloy Steel</li>
<li>Strength Grade: 8.8, 10.9, 12.9</li>
<li>Special carbon steel: 45# steel, 35K available upon request</li>
</ul>

<h3>Surface Finish</h3>
<ul>
<li>Black Oxide</li>
<li>Electro Zinc Plated</li>
<li>Hot‑dip Galvanized</li>
<li>Custom finishes according to requirements</li>
</ul>

<h3>Application & Service</h3>
<p>Widely used in machinery equipment, construction, steel structures, transportation and general industrial fastening scenarios.</p>
<p>OEM & ODM are acceptable. We support custom drawings, special materials and surface treatments. Feel free to contact us for quotation and technical support.</p>

DIN931 Hex Bolt Dimensions (Unit:mm)