Stainless Steel Solid Rivets

Choosing the Right Solid Rivet
1) What is a solid rivet & when to use it?

A solid rivet is a one-piece fastener with a head at one end and a plain shank at the other.
The shank is plastically deformed (upset) using a hammer or rivet gun to form a second head, permanently clamping the materials together.

Use solid rivets when you need:

A permanent, vibration-resistant joint

High shear strength with no threads

A fastener that will not loosen under shock or vibration

A solution that can work in tight, low-profile spaces once set

Typical applications:

Structural sheet joints (bridges, structures, railway, heavy fabrication)

Aerospace & automotive (skins, frames, chassis, brackets)

Crane booms, truck bodies, wagons

General sheet metal work where high shear and fatigue resistance are required

Solid rivets require access to both sides of the joint (to buck the tail), unlike pop/blind rivets.

2) Head style – appearance, clearance & load spread

Common solid rivet head types:

Snap / Round / Universal head

Dome-shaped head with good load spread and fatigue resistance.

Very common in structural and aerospace joints.

Countersunk (CSK) head

Head sits flush with the surface in a countersunk hole.

Used where aerodynamics, appearance, or clearance are important (skins, covers, sliding surfaces).

Pan / Flat head (various low-profile heads)

Lower profile than snap/universal, but still gives good bearing area.

Used where you have some but not much head height available.

Selection:

General high-shear structural joints → Snap / round / universal head.

Flush surfaces (aero skins, panels, door edges) → Countersunk.

Limited clearance, but not fully flush → Pan/flat/low-profile head.

3) Diameter & length – grip and joint thickness

Solid rivets are specified by:

Shank diameter (e.g. 3 mm, 4 mm, 5 mm, 6 mm, etc.)

Shank length (before setting)

a) Diameter (strength & hole size)

Larger diameter → higher shear and tensile capacity.

Hole size should be just over the rivet diameter (close fit) to minimise slop and improve fatigue performance.

Very rough guidance (final choice by drawing/design):

Thin sheets, light structural joints → 3–4 mm

Medium brackets, vehicle work, heavier sheet joints → 4–5 mm

Heavy structural fabrications → 5–8 mm+, as per design

b) Length (grip length + upset allowance)

Rivet length must be enough for:

Total material thickness (grip): sum of all sheets/plates

Extra shank length to form the tail head (upset)

Rule of thumb (approximate):

Shank length ≈ Grip thickness + 1.3–1.6 × rivet diameter

This provides enough material to form a proper second head.

Too short → Small or incomplete tail head → weak joint.
Too long → Excess material → distorted head, risk of bending.

Mechanical Properties (Guide) – Solid Rivets

Solid rivets are designed primarily as shear fasteners (especially in lap joints), but they also carry tensile load.
Joint strength comes from both the rivet material and the clamped plates.

1) Strength behaviour

For a given rivet size & material (e.g. Ø5 mm steel rivet):

Shear strength

Force required to shear the rivet across the joint plane.

Solid rivets can give very good shear performance due to continuous cross-section and close fit.

Tensile (pull-out) strength

Force required to tear the head off or pull the rivet through the plate.

Depends on head size, plate thickness/material, and rivet material.

In general:

Shear strength ≈ 60–70% of tensile strength for many ductile metals (very rough rule; actual values come from manufacturer data and standards).