... , etc. or technical drawing.Usually we produce compression spring as below steps: winding, grinding, chamfering, shaping, quenching, forced processing, stereo type, ... .When producing, we checked every 15 minutes for every steps by professional.Before packing, we tested and checked all ... orders.Minimum quantity: usually 5000-10000pcsPayment terms: total amount below or equal to USD5000.00, 100% T/T in ...