Import Din 7991 Hex Socket Countersunk Head Cap Screws — Buy in wholesale FOB from Supplier in China

Din 7991 hex socket countersunk head cap screws from Ningbo Steel Bolt Co., Ltd are manufactured to DIN 7991 and ISO standards, with metric thread sizes ranging from M2 to M12 and lengths from 3mm to 100mm. The screws feature a countersunk head with a hexagonal socket drive, designed for flush mounting in applications requiring low profile fastening. Material options include carbon steel, alloy steel, and stainless steel, with mechanical grades 8.8, 10.9, and 12.9 available as specified. Surface finishes include plain, zinc-plated, and black oxide, each offering distinct corrosion resistance levels for different environments.

Carbon steel screws in grade 8.8 are typical for general mechanical assemblies, while 10.9 and 12.9 grades are used in high-stress applications such as automotive and heavy machinery. Stainless steel variants, typically AISI 304 or 316, are selected for corrosion-prone environments like marine or chemical processing. The dimensional tolerances follow ISO 888 for hex socket dimensions and DIN 7991 for head geometry. Packaging is in plastic bags inside cartons, stacked on wooden pallets for bulk shipping, with each carton holding between 1,000 and 5,000 pieces depending on size.

These screws are commonly sourced by manufacturers of industrial equipment, aerospace components, and precision machinery requiring reliable, flush-mounted fasteners. Buyers in Europe, North America, and Southeast Asia typically order quantities from 5,000 to 50,000 pieces per shipment. Trade terms are usually FOB Shanghai or Ningbo, with payment by T/T in advance or against copy of B/L. Lead time is typically 15 to 25 days after order confirmation, subject to material availability and order volume.

Ningbo Steel Bolt Co., Ltd is based in Zhenhai District, Ningbo, Zhejiang Province, China, and operates as a manufacturer and exporter of industrial fasteners. The company is registered with the local trade authority and holds harbor-tier verification, indicating active export activity and compliance with basic customs documentation. The listing confirms production capacity of 100,000 pieces per month and availability of multiple finishes and grades, but provides no details on workforce size, founding date, or client list.

The supplier does not claim certifications such as ISO 9001 or material test reports, nor does it specify in-house testing capabilities. Its operational focus appears to be on volume production and export logistics, with shipments routed through Shanghai and Ningbo ports. Response rate and average response time are not tracked in the platform data, suggesting limited direct buyer engagement. Buyers should verify material certifications and dimensional compliance directly with the supplier before placing orders.