Rivet Size Calculator

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The head shape affects the closing-head allowance multiplier and, for countersunk heads, the grip length calculation.
Boiler and aviation applications use higher closing-head multipliers for safety margins.
Material type sets the minimum edge distance and pitch multipliers for the spacing table.
The thickness of the single thickest plate being joined. The minimum rivet diameter is 3 times this value.
mm
The combined thickness of all plates being joined. The rivet shank must span this entire distance plus the closing-head allowance.
mm
Minimum shank diameterMinimum size
9

Smallest acceptable rivet diameter: 3 x thickest-plate thickness

Recommended (standard) diameter9
Closing-head allowance13.5
Required shank length18.5
Hole diameter (minimum)9.1
Hole diameter (maximum)9.25
Minimum rivet pitch (centre-to-centre)36
Minimum edge distance18
_unitLabelmm
Min diameter9
Rec. diameter9
Closing allowance13.5
Shank length18.5

Recommended rivet: 9 mm diameter, 18.5 mm shank.

  • Use a 9 mm diameter rivet with a 18.5 mm shank (button/round head).
  • Drill holes to between 9.10 and 9.25 mm.
  • Space rivets at least 36.00 mm apart (centre to centre) and keep centres at least 18.00 mm from any plate edge.

Next stepAlways consult the relevant structural standard (ISO, ASME, BS) for your specific joint design, load case, and material combination.

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