Using the Request for Quote (RFQ) form provided on this page, you can request competitive procurement options on part number 21666 with rapid responses always offered by our staff. To ensure that you locate and procure exactly what you need with ease, we list parts with as much information as we can. For example, part number 21666 It is listed as Spring Helical Compression. component manufactured by Eaton Corporation, specifically under CAGE Code 99643. It is also accompanied by the NSN 5360005667491 for ease of organization, the first digits of the NSN indicating that the part belongs to FSC 5360 Coil Flat Leaf and Wire Springs.