The LD-394 carbon steel washer series provides flat and fender washers engineered to distribute clamping load, protect mating surfaces, and prevent fastener pull-through across a wide range of metric assemblies. Covering inner diameters from M3 to M20, the series includes standard flat washers to DIN 125 and large outer-diameter fender washers to DIN 9021, with thicknesses ranging from 0.5 to 4mm. This variety allows buyers to specify the correct bearing area and thickness for each joint, whether securing a small electronic enclosure or reinforcing a structural connection in soft material.

The primary function of any washer is load distribution. A flat washer placed under a nut or bolt head spreads the clamping force over a larger area than the fastener alone, reducing surface damage, preventing embedding into soft materials, and helping maintain tension in the joint. In applications where the hole is oversized or the substrate is thin or soft, a standard washer may be insufficient, and the larger bearing area of a fender washer becomes essential. By spanning a wider diameter, the fender washer resists pull-through and provides a stable bearing surface even in compromised or worn holes, which is why these washers are widely used in automotive body repair, sheet metal work, and timber construction.

Dimensional control and corrosion protection are governed by recognized standards throughout the series. Standard flat washers are produced to DIN 125 with controlled inner diameter, outer diameter, and thickness tolerances, while fender washers conform to DIN 9021 with a characteristically large outer diameter relative to the bore. The carbon steel substrate is finished with white/blue or yellow zinc plating, providing corrosion resistance for indoor and covered outdoor service. A plain (unplated) finish and stainless steel 304/316 options are available for environments where rust prevention is critical, such as food processing, marine, and outdoor structures.

For wholesale buyers and OEM accounts, the LD-394 series supports flexible customization and packaging. OEM sizes, inner and outer diameters, and thicknesses can be produced to specification, along with custom plating, stainless steel variants, private-label branding, and custom retail packaging. With a minimum order quantity of 5000 pieces, mixed orders across sizes and types supported, and a production lead time of 5 to 12 days, the series offers importers, assemblers, and distributors a dependable, standards-compliant source of carbon steel flat and fender washers at competitive wholesale pricing.