Crucial for flush-head installations, this section specifies how the metal sheets should be prepped. Dimpled. C: Countersunk. D2C: Dimple the top two sheets and countersink the third. 4. Southeast (SE): Rivet Length Length is indicated in increments of 1/16th of an inch . A -6 code represents a rivet length of 6/16", or 3/8".
document is the formal standard practice for fastener codes. GlobalSpec If you'd like, I can help you decode a specific part number or provide formulas for calculating proper rivet length for your project. NAS523 Rivet Identification Guide | PDF - Scribd nas523 rivet code pdf