Rivet Parameters
Material Stack Thickness
Accepts fractions like 3/32 or decimals like 0.094
Joint Parameters
Accepts fractions like 12-1/2
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Rivet Designation Guide
AN426 / MS20426Flush (100°)
AN470 / MS20470Universal head
AD material2117-T4 aluminum
Part no. -33/32" diameter
Part no. -41/8" diameter
Length suffix16ths of an inch
Example: AN426AD3-3.5 = Flush, 2117-T4, 3/32" dia, 3.5/16" long
Rivet Length Formula
For solid rivets: L = T + 1.5 × D
T = total stack thickness, D = shank diameter. The 1.5D protrusion forms the shop head when bucked.
Spacing Rules Summary
Min edge dist (universal)2D
Min edge dist (flush)2.5D
Recommended edge dist2.5D–3D
Min pitch (single row)3D
Typical pitch (universal)3.5D–4D
Typical pitch (flush)4D–5D
Disclaimer
General calculator only — always follow Van's Aircraft plans or approved aircraft data when specific requirements differ. This tool does not replace engineering judgment or FAA-approved data. AC 43.13-1B is the primary reference for sheet metal work.