Product:contact washer NFE 25-511 Single side serrated lock washer 1. Standard: NFE25-511 2. Size: M4-M20 3. Material: carbon spring steel 65Mn 4. Surface treatment:zinc plated optional: black oxide, phosphate,plain,dacromet 5. Package: polybag packing ,then in carton 6. Other customer design will be produced according to the sample or drawings
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