Rivet Strength Calculator – Calculate Rivet Shear Capacity

Calculate the shear and bearing capacity of riveted joints. Essential for structural steel design.

Rivet Diameter (mm)

Shear Strength (MPa)

Number of Rivets

How to Use This Rivet Strength Calculator

Enter rivet diameter

Input the diameter of the rivet in millimeters. Common sizes range from 3mm to 20mm depending on application.

Enter shear strength

Input the material's shear strength in MPa. Steel rivets typically range from 300-800 MPa.

Enter number of rivets

Specify how many rivets share the load. The calculator shows per-rivet capacity and total joint strength.

Rivet Material Properties

Material	Shear Strength (MPa)	Tensile Strength (MPa)	Common Uses
Aluminum (2117)	200-250	270	Aircraft, light structures
Steel (Mild)	300-400	400-500	General construction
Steel (High Strength)	500-700	700-900	Bridges, heavy structures
Stainless Steel	400-600	550-750	Marine, food processing
Monel	350-450	500-650	Corrosive environments

Understanding Rivet Strength

Rivets transfer load through shear — the force trying to slide connected plates past each other. The rivet resists this by its cross-sectional area and material strength. Single shear means one shear plane; double shear (rivet through three plates) doubles capacity.

The shear capacity formula is straightforward: Area x Shear Strength. Area equals π x (diameter/2)². A 10mm steel rivet with 400 MPa shear strength has a cross-section of 78.5 mm², giving about 31.4 kN single shear capacity.

Bearing strength — the plate material crushing around the rivet — often governs before the rivet itself fails. Bearing capacity depends on plate thickness, material strength, and edge distance. As a rule of thumb, bearing strength is roughly 2x shear strength for steel.

Design tip: Always apply a safety factor. For structural applications, use 2.0-3.0. For critical aerospace applications, factors of 1.5-2.0 are common with rigorous quality control.

Rivet Design Best Practices

Edge Distance

Keep rivets at least 2x diameter from plate edges. Closer edges risk tear-out failure. For highly loaded joints, use 2.5-3x diameter.

Pitch (Spacing)

Space rivets 3-4x diameter apart along the load direction. Closer spacing weakens the plate; wider spacing allows plates to separate between rivets.

Row Spacing

For multiple rows, space them 2.5-3x diameter apart. Staggered (zigzag) patterns distribute load better than straight rows.

Hole Tolerance

Rivet holes should be 0.1-0.2mm larger than the rivet diameter for proper installation. Oversized holes reduce shear capacity and allow movement.

Frequently Asked Questions

What's the difference between single and double shear?

Single shear has one failure plane (two plates). Double shear has two failure planes (three plates), doubling capacity. A rivet through a lap joint is single shear; through a butt joint with cover plates is double shear.

How do I choose rivet diameter?

Match diameter to plate thickness — typically 3x the thinner plate thickness. A 6mm plate needs roughly an 18mm rivet. Also consider available space and edge distance requirements.

Are bolts stronger than rivets?

High-strength bolts generally have higher capacity than rivets of the same diameter. But rivets excel in fatigue resistance and don't loosen under vibration. Choice depends on application requirements.

What safety factor should I use?

Structural steel: 2.0-2.5. Bridges: 2.5-3.0. Aircraft: 1.5-2.0 (with strict quality control). Pressure vessels: 3.0-4.0. Higher factors for dynamic loads, corrosion, or uncertain conditions.

How do I calculate rivet group capacity?

For concentric loading, multiply single rivet capacity by the number of rivets. For eccentric loading, the outermost rivets carry more load — use vector analysis or finite element methods for accurate results.

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