螺母 This item was sourced on www.MFG.com as one of the items in an RFQ in CHINA for Allenuts 材料45Cr 碳钢 M30粗牙，螺纹牙型按GB/T 192-2003, 8级。 Part Part Number: 螺母1 Material: Carbon Steel Material Grade: Technical Specifications Category:Allenuts Dimensions0.0 x 0.0 inch Annual Usage:1000.0 The following suppliers (machine shops, fabricators, casters, molders, 3D printing, CNC machining, etc.) provide manufacturing services for the machine tool industry, automotive industry… For more information visit www.MFG.com. MFG.com analyzes all engineered parts and RFQs for improved manufacturability and to ensure quality and a quick quoting experience. Allenuts: An allenut is a high strength internally wrenching nut used in counter-bore applications. A standard hex key is used for wrenching.