... -No.12 , 1/4"-1/2" Certification: ISO9001, ISO14001 Features: hard washer 1.StandardDIN137, DIN 6797. DIN6798, ANSI B 18.21 ... .Lead time10- 15 days 9.Sample lead time5- 6 days 10.inside packingInside is punny bag packing to avoide the wet ... in manufacturing industrial fastening pieces and machinery parts for about 10 years. It integrates exploitation, design, sales and service into one ...