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Metric 12.9 Flat Socket Cap, Din 7991, Zinc Cr+6, Alloy
Metric flat socket cap screws manufactured to DIN 7991 and rated at Class 12.9 deliver extremely high tensile strength and a fully flush, countersunk profile designed for demanding industrial, structural, and precision‑engineered applications. Made from premium alloy steel and finished with a Zinc Cr+6 (hexavalent chrome) plating, these screws provide strong corrosion resistance, a bright silver finish, and excellent durability under tough operating conditions.
The Zinc Cr+6 coating offers superior protection against oxidation and wear while maintaining consistent surface coverage around the entire fastener. Combined with the internal hex drive and flush‑mount flat head, these screws are ideal for assemblies requiring strength, security, and a clean, unobtrusive appearance.
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Class 12.9 alloy steel delivers one of the highest strength ratings available for metric socket screws, making these fasteners an excellent choice for heavy‑load machinery, mechanical systems, robotics, automotive construction, and high‑stress OEM assemblies.
The Zinc Cr+6 plating provides reliable corrosion protection for indoor and moderate outdoor environments while offering the bright, traditional appearance associated with hexavalent zinc coatings.
DIN 7991 compliance ensures precise head geometry, correct countersink angles, and accurate thread tolerances—guaranteeing proper fit in any engineered recess. These screws are available in a full range of metric diameters and lengths to meet strict specification requirements.
