About Us

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Donma Auto Parts Co., Ltd. is a professional manufacturer and supplier engaged in the production and sales of various bolts、nuts、 washer and Self‑drilling Screw hardware custom accessories.

The company’s core product portfolio covers high-strength bolt connection series, hex fastener series, nut series, washer series and non-standard custom fastener series.

Our products are available in compliance with multiple authoritative standards, including Chinese GB national standards, ISO international standards, German DIN standards, American ANSI standards, British BS standards and Japanese JIS standards. Custom production based on personalized professional requirements from customers is also supported.

Widely applicable across multiple fields, our products are extensively used in railway bridges, metallurgy, petrochemicals, mechanical electronics, building steel structures, shipping, aviation, wind power generation and other industrial sectors.