Blind rivets: how they work and how to install them correctly

Blind rivets are one of the most reliable methods of joining metal parts without welding, especially when it comes to car body repair, assembling metal structures or working with thin sheet metal. Their main advantage is ease of installation and high joint strength, which is not inferior to traditional rivets or even surpasses it in some cases. But how exactly do they work? Why are they called “pull” joints, and how do they differ from classic rivet joints?

In this article we will look at operating principle of blind rivet systems, their structure, types (including aluminum, steel and stainless steel options), and we will also dwell in detail on installation technologies - from choosing a tool to step-by-step instructions. We will pay special attention to typical errors that lead to weakening of the connection or damage to parts. If you do auto repair, manufacture metal structures, or just want to understand the topic, this material will be useful.

What is a blind rivet and how does it work?

Blind rivet (also called blind rivet or rivet with core) is a fastening element that allows you to connect parts with one-way access. Unlike traditional rivets, its installation does not require drilling a hole through and deforming the shank on the reverse side. This makes it indispensable in situations where it is impossible to get to the back of the part (for example, when repairing a car body or assembling closed profiles).

Structurally, the blind rivet consists of two main parts:

• 🔹 Housing (sleeve) - a hollow tube with a head (cap), which remains in the hole after installation. The sleeve material determines the strength and corrosion resistance of the joint.
• 🔹 Core (rod) - a metal rod with a thickening (embedded head), which is pulled out with a special tool, deforming the body and creating a reliable connection.

The installation process is based on plastic deformation of the rivet body under the action of pulling force. When the core is pulled out, its thickened part “expands” the sleeve, forming a so-called “closing head” on the reverse side. After this, the core breaks off at the planned location, and its remainder is removed. The result is a strong connection that can withstand significant shear and tensile loads.

Types of blind rivets: materials and designs

The choice of blind rivet type depends on material of connected parts, required joint strength and operating conditions (for example, exposure to moisture or chemicals). Let's look at the main varieties that are most often used in auto repair and metalworking.

1. According to the body material

• 🔧 Aluminum rivets — lightweight, resistant to corrosion, but have less strength compared to steel. Suitable for joining thin sheet metal (e.g. aluminum body panels).
• 🔧 Steel rivets - the most durable, but susceptible to rust. Often used to connect steel parts in structures where high load capacity is required.
• 🔧 Stainless steel rivets — the optimal option for working in aggressive environments (for example, in the engine compartment of a car). Combine strength and corrosion resistance.
• 🔧 Copper rivets - used less frequently, mainly for decorative purposes or in electrical engineering (due to high electrical conductivity).

2. According to the core design

The core can be made of the same material as the body, or from a stronger alloy. An important parameter is the availability laying head, which determines the shape of the liner deformation. For example:

• 🔨 Standard cores - form a classic closing head.
• 🔨 Cores with an enlarged head — used for joining soft materials (plastic, thin metal) to avoid pushing through.
• 🔨 Threaded cores — allow you to attach additional elements (for example, brackets) after installing the rivet.

Rivet type	Housing material	Shear strength(kgf)	Scope of application
Standard	Aluminum	100–300	Body work, thin metal
Reinforced	Steel	400–800	Load-bearing structures, frames
Stainless	A2/A4 (stainless steel)	300–600	Automotive parts, marine structures
With thread	Steel/stainless steel	200–500	Fastening brackets and electrical equipment

When choosing a rivet, also consider sleeve diameter and length. The diameter should correspond to the hole in the parts (usually 0.1–0.2 mm larger), and the length should correspond to the total thickness of the materials being joined plus the allowance for forming the closing head (about 1.5 times the diameter of the rivet).

Blind rivet installation tool

To install blind rivets, a special tool is required - riveter (or rivet gun). It can be manual, pneumatic or hydraulic. The choice depends on the amount of work and the thickness of the parts being connected.

1. Manual riveters

The most common option for home workshops and small car services. Manual models are divided into:

• 🛠️ One-handed — compact, suitable for rivets with a diameter of up to 4.8 mm. Convenient for working in hard-to-reach places.
• 🛠️ Two-handed — develop greater force, used for rivets with a diameter of 5–6.4 mm.

2. Pneumatic and hydraulic riveters

Used in industrial environments or for large volumes of work. Allows installation of rivets with a diameter of up to 10 mm or more. Main advantages:

• ⚡ High speed of work (up to 10–15 rivets per minute).
• ⚡ Minimum operator effort - installation force is created by compressed air or hydraulics.
• ⚡ Ability to work with thick materials (up to 10–12 mm in total).

In addition to the riveter, you will need:

• 🔨 Metal drill (diameter to match the size of the rivet).
• 🔨 Reamer or countersink for removing burrs after drilling.
• 🔨 Attachments for riveter (for different diameters of cores).
• 🔨 Protective equipment: gloves and glasses (if the core breaks, fragments may fly out).

Step-by-step instructions for installing a blind rivet

The blind rivet installation process includes several key steps. If you miss even one of them, the connection may not be reliable. Let's look at the detailed instructions using the example of a manual riveter.

Step 1: Preparing the Hole

The diameter of the hole must strictly correspond to the diameter of the rivet. For example, for a rivet 4.0 mm drill a hole 4.1–4.2 mm. A hole that is too large will weaken the connection, while a hole that is too small will make installation difficult.

After drilling, be sure to remove burrs sweep or countersink. They can interfere with the tight fit of the parts and deformation of the sleeve.

Step 2: Assembling the Parts

Align the parts to be joined and insert the rivet into the hole. Make sure that the rivet head fits snugly against the surface - no gaps are allowed. If the parts have different thicknesses, the thicker one should be on the side of the rivet head.

Step 3: Installing the Rivet

1. Insert the rivet core into riveter attachment corresponding diameter.
2. Place the tool over the mandrel and press firmly against the rivet head.
3. Start squeezing the riveter handles. The core will begin to stretch, deforming the sleeve.
4. Continue until the core breaks (you will hear a characteristic click).

Step 4: Check the connection quality

After installation, check:

• 🔍 No backlash between parts.
• 🔍 Uniform deformation of the sleeve on the reverse side (the closing head must be symmetrical).
• 🔍 No cracks or tears on the rivet head.

What to do if the core does not break?

If the core does not break at the intended location, this may mean that:

- A low-quality rivet is used (the core is too strong).

- Insufficient force of the riveter (try a two-handed model or a pneumatic tool).

- The core is jammed in the sleeve (check the compatibility of the diameters).

In this case, carefully cut the core with side cutters and replace the rivet.

Typical mistakes when working with blind rivets

Even experienced craftsmen sometimes make mistakes that lead to loose connections or damaged parts. Let's look at the most common of them and ways to avoid them.

⚠️ Attention: If the rivet is installed crookedly or skewed, it must be removed and replaced. Reusing the hole without drilling it to a larger diameter is unacceptable - this will weaken the connection by 30–50%.

1. Wrong choice of hole diameter

If the hole is too large, the rivet sleeve will not deform properly and the closing head will be weak. Too small and it makes installation difficult and can lead to cracks in the material.

Solution: Use drills with an accuracy of ±0.1 mm and check the hole diameter caliber or caliper.

2. Insufficient sleeve length

If the length of the rivet is less than the total thickness of the parts plus the allowance for the closing head, the connection will be unreliable. The optimal length of the sleeve is calculated by the formula:

Rivet length = Part thickness + (1.5 × Rivet diameter)

3. Distortion during installation

If the riveter is not perpendicular to the surface, the core is pulled out crookedly and the liner is deformed unevenly. This leads to weakening of the connection and possible formation of cracks.

Solution: Use thrust devices or magnetic holders to fix the riveter in the correct position.

4. Use of low-quality rivets

Cheap rivets often have uneven shell wall thickness or a core that is too strong and does not break in the right place. This leads to marriage and loss of time.

Solution: Buy rivets from trusted brands such as Gesipa, Avdel or Alcoa.

Error	Consequences	How to avoid
Hole too big	Weak closing head, backlash	Use a drill of the exact diameter
Short rivet	Incomplete deformation of the sleeve	Calculate length using formula
Tool misalignment	Uneven load distribution	Fix the rivet gun perpendicularly
Poor quality rivets	Core breakage is not in the intended location	Choose products from trusted manufacturers

Application of blind rivets in auto repair

In body repair, blind rivets are used for:

• 🚗 Fastening trims and moldings (for example, when repairing bumpers or thresholds).
• 🚗 Body panel assemblies after straightening or replacing parts.
• 🚗 Mounting accessories (towbars, crankcase guards, brackets).
• 🚗 Repair of corrosion damage (patches on the arches or bottom).

Advantages over welding:

• ✅ There is no risk of burning metal (relevant for thin panels).
• ✅ No deformation of parts due to heating.
• ✅ Ability to work with galvanized and aluminum parts without damaging the protective layer.

⚠️ Attention: When repairing a body, do not use steel rivets to connect aluminum parts without anti-corrosion treatment. Contact of different metals will lead to electrochemical corrosion and destruction of the connection within 1–2 years.

For body work the following are most often used:

• 🔧 Aluminum rivets diameter 3.2–4.8 mm (for thin metal).
• 🔧 Stainless steel rivets diameter 4.0–6.4 mm (for load-bearing elements).
• 🔧 Large head rivets (for plastic linings).

Alternatives to blind rivets: when not to use them

Despite their versatility, blind rivets are not always the optimal solution. Let's look at cases where it is worth considering alternative fastening methods.

1. Connections with high dynamic loads

If parts are subject to constant vibration or shock loads (for example, suspension elements), it is better to use:

• 🔩 Bolted connections with groovers or lock washers.
• 🔩 Threaded rivets (if you need removable fasteners).

2. Working with very thick materials

For metal with a total thickness of more than 10 mm, blind rivets are ineffective - a sleeve that is too long is required, which is difficult to deform evenly. In such cases apply:

• 🔧 Classic rivets (with two-way access).
• 🔧 Welding (if heating of parts is allowed).

3. Sealed connections

Blind rivets do not provide a complete seal (unlike welding or soldering). If protection from moisture or gases is required, use:

• 🛡️ Rivets with sealing coating (for example, with rubber gaskets).
• 🛡️ Adhesive-rivet joints (combination of glue and rivet).

Also, blind rivets are not suitable for joining soft materials (for example, plastic without reinforcement) - the sleeve may simply break out. In such cases use rivets with enlarged head or self-tapping screws with press washer.

FAQ: Frequently asked questions about blind rivets

Can the blind rivet be removed after installation?

Yes, but it is a labor-intensive process. To remove it, you need to drill out the rivet head with a drill slightly larger in diameter than the sleeve, and then knock out the remaining core. An alternative is to use a special drilling tool for removing rivets (for example, from Gesipa). Once removed, the hole can be reused, but only for a larger diameter rivet.

Which riveter to choose for home use?

Suitable for periodic work manual two-handed riveter with a set of attachments (for example, KING TONY 93917 or Yato YT-0939). It handles rivets with a diameter of up to 6.4 mm. For professional use it is better to choose pneumatic riveter (for example, Gesipa Accubird), which reduces installation time and reduces hand fatigue.

Can blind rivets be used to fasten glass or ceramics?

No, this is unacceptable. Glass and ceramics do not have sufficient ductility, and when the sleeve is deformed, they will crack. For such materials use special adhesives (for example, epoxy or polyurethane) or mechanical fastenings with gaskets (for example, through rubber seals).

How to check the strength of an installed rivet?

The strength of the connection can be assessed visually and mechanically:

1. Check the symmetry of the closing head on the reverse side - it should be evenly deformed.
2. Try moving the parts by hand - play or displacement is unacceptable.
3. For critical connections use torque wrenchto check the tensile strength (must correspond to the rivet’s data sheet).

What is the difference between blind rivets and rivet nuts?

Blind rivets are designed for permanent connection details, while rivet nuts (or ringayki) allow you to create threaded connections in thin sheet metal. The rivet nut has an internal thread and is installed in the same way as a blind rivet, but after installation, bolts or studs can be screwed into it.