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Aircraft Rivet Calculator

Step-by-step tool to determine the minimum rivet diameter and required rivet length for sheet metal repairs. Supports both inches and millimeters. Used by aircraft mechanics for structural repairs and modifications.

Rivet Calculator

Input Requirements: Enter thickness measurements in the selected unit. Calculator will determine minimum rivet specifications per industry standards.

Thickest Plate Thickness (in)

Total Clamping Thickness (in)

Minimum Rivet Diameter (in)

Required Rivet Length (in)

Rivet Calculation Guidelines

Follow these industry-standard formulas for structural rivet sizing:

Minimum Rivet Diameter

Minimum Diameter = 3 × Thickness of Thickest Plate

Ensures adequate shear strength for the joint

Required Rivet Length

Required Length = Clamping Thickness + (1.5 × Rivet Diameter)

Provides proper shop head formation (1.5D protrusion)

Pro Tip: Always round up to the next standard rivet size. Never use a rivet smaller than the calculated minimum diameter.

Industry Standards for Rivet Spacing

Select material type to determine proper rivet spacing and edge distance:

Material	Spacing Rule	Edge Distance Rule
Aluminum	4 × Rivet Diameter	2 × Rivet Diameter
Steel	4.5 × Rivet Diameter	2.5 × Rivet Diameter
Composite	5 × Rivet Diameter	3 × Rivet Diameter

Source: FAA AC 43.13-1B, Aircraft Structural Repair Manual (SRM).

Critical Safety Note

Always consult the specific aircraft Structural Repair Manual (SRM) for critical repairs. These calculations provide general guidance only. Factors such as material type, load bearing requirements, and environmental conditions may require adjustments to standard values.