Import Din9250 Double Side Knurl Lock Washer — Buy in Bulk from Supplier in China

The Din9250 Double Side Knurl Lock Washer is a precision-engineered fastener component designed to prevent loosening under vibration and dynamic loads. It conforms to DIN 9250 standards, with outer diameters ranging from 6mm to 24mm and thicknesses between 0.8mm and 3.0mm, matching standard metric bolt sizes. The washer features knurled surfaces on both sides, creating a textured grip that increases friction against mating surfaces without requiring additional coatings or adhesives.

These washers are typically manufactured from carbon steel or stainless steel grade A2-70, with surface treatments including zinc plating or black oxide for corrosion resistance. The knurl pattern is formed through cold forging, ensuring consistent depth and angularity across batches. In industrial use, this design is preferred over split or spring washers where higher clamping stability is needed, especially in environments with frequent thermal cycling or mechanical shock.

Buyers in automotive assembly, heavy machinery, and rail transport commonly specify this washer for critical joints where bolt slippage could compromise safety. Orders are typically fulfilled in bulk quantities, packaged in polybags or cartons of 1,000 to 5,000 pieces. Standard trade terms include FOB Shanghai or CIF destination port. Lead times for standard sizes are generally 15 to 25 days after order confirmation, subject to material availability.

Suzhou Ruibo Machinery And Electronics Co., Ltd. operates from Suzhou, Jiangsu Province, China, with a focus on precision metal fasteners and mechanical components. The company is registered as a manufacturer with verified export credentials and maintains production facilities equipped for cold forging and surface treatment processes. Publicly available data confirms its active status as a supplier to industrial distributors but does not specify client names, annual output, or workforce size.

The supplier has no publicly listed certifications such as ISO or IATF, and response metrics on the platform are not available. Their listing indicates direct manufacturing capability, not trading. Buyers should request material test reports and dimensional inspection certificates for each batch. No claims about years in business, awards, or export volume are supported by the source data.