Rivet This item was sourced on www.MFG.com as one of the items in an RFQ in USA for Rivets Buyer is in search of some Alcoa rivets, NAS1921M06S04 - Certificate of Conformance Needed. Part Part Number: NAS1921M06S04 Material: Material Grade: Technical Specifications Category:Rivets Dimensions0.0 x 0.0 inch Annual Usage:50000.0 The following suppliers (machine shops, fabricators, casters, molders, 3D printing, CNC machining, etc.) provide manufacturing services and are members of the MFG.com community. For more information visit http://www.mfg.com. MFG.com performs a 5-point inspection on all engineered parts and RFQs to ensure quality and enhance your quoting experience Rivets: A rivet is a mechanical fastener consisting of a smooth cylindrical shaft with heads on either end, the second one formed in position when installed. Rivets are used to provide a permanent, secure stationary joint for various materials.