Stainless steel cap material is SUS304 - DIN1587 (M3X0.5, M4X0.7, M5X0.8 other standard models Dongguan City Hardware Machinery Co., Ltd. engaged in standard machines and Nut Nut manufacture for over twenty years, has accumulated a wealth of production experience and strong technical force. Our main products include K cap, disc-shaped cap, flange cap, nylon nuts, hex cap, square cap and a variety of non-standard shaped pieces. Material titanium, copper, iron, aluminum , stainless steel and other products are used in electronic equipment, medical equipment, automotive, etc. The company is currently locking, shock nut series of the most professional, the product of the most competitive manufacturers. external gear nut first sales, price the national minimum.