What Is the Grip Range for Blind Rivets?
Key Points
- The grip range determines which rivet length must be selected.
- Every blind rivet has a defined minimum and maximum grip range
- Correctly determining the grip range is crucial for a load-bearing joint
- If the wrong rivet is selected, the materials may not be joined properly or the material may be damaged
What is the grip range and why is it important?
When selecting a blind rivet, sooner or later you’ll come across a specification such as “grip range 0.5–3.0 mm.” But what does this mean?
The grip range describes the total material thickness that a blind rivet can securely join. In other words: It specifies the maximum combined thickness of the material layers to be joined so that the blind rivet can be set correctly and form a secure joint.
This value is not merely a technical detail. It directly determines whether your joint will hold or not. Blind rivets will only function reliably if the grip range of the selected blind rivet matches the actual grip range of the application. If the grip range does not match the material thickness, a proper joint will not be formed, and under certain circumstances, it may even come loose.
Within the overall structure of a blind rivet, the grip range complements other parameters such as diameter and material. Only by taking all three into account can you achieve a permanently load-bearing joint.
How is the grip range structured?
Each grip range consists of two limits: the minimum grip range and the maximum grip range.
The minimum grip range specifies the thinnest material thickness at which the rivet still functions properly. If you fall below this value—because your layers are too thin overall—the rivet shank will protrude too far through the material. The closing head will then be unable to unfold properly. The rivet will sit loosely, may rattle, and will not transmit sufficient clamping force.
The maximum clamping range marks the upper limit. If you exceed this limit—because your grip range is too great—the rivet shank may break off before it fully forms the closing head. The result is a rivet that appears to be set but is actually loose and may fail under load.
Therefore, always stay within the grip range. The rivet will function as intended by the manufacturer only within the permissible range.
How do I determine the correct grip range for my application?
The first step is simple: Measure the total material thickness of all layers you want to join. Stack all the parts on top of each other and measure the combined thickness as they will be riveted later. Be sure to include any gaps, coatings, or interlayers in your measurement.
Then compare this measurement with the grip range specified in the product designation. Many manufacturers include this information directly in the product or model designation. An entry such as “3.2 x 10 / 0.5–3.0” means: blind rivet body diameter 3.2 mm, blind rivet body length 10 mm, grip range 0.5 to 3.0 mm.
On packaging and data sheets, you’ll usually find the grip range listed in a clear table, often supplemented by recommended hole diameters and maximum shear and tensile strengths. Read this information carefully before placing an order, because once installed, an incorrectly selected rivet cannot be adjusted.
What factors influence the choice of grip range?
The total material thickness is the most important factor, but not the only one. You should also consider the following points:
Material type and hardness: Soft materials such as plastic or thin aluminum behave differently under setting force than steel. With brittle materials, the wrong rivet can damage the material.
Number of layers: If you’re joining three or more layers, add up all the individual dimensions. Even small measurement inaccuracies can add up significantly here.
Type of load: Are tensile strengths, shear strengths, or vibrations acting on the joint? For dynamic loads—such as in vehicles or machinery—manufacturers often recommend a narrower grip range to achieve a tighter form fit.
Rivet material: The material of the blind rivet has no direct influence on the choice of grip range. Rather, it is crucial that the rivet is suitable for the specific application. Factors such as the properties of the materials to be joined, the required strength, corrosion resistance, or the operating environment should be taken into account during selection. Since blind rivets often consist of different materials for the blind rivet body and the mandrel, numerous material combinations are available for a wide variety of applications.
Conclusion
The grip range is one of the most important specifications when selecting blind rivets. Therefore, always check it before purchasing and carefully measure your total material thickness.
If you’re unsure which rivet is suitable for your application, choose a rivet with a slightly narrower grip range when in doubt. A narrower grip range ensures a tighter form fit and a more secure joint than a rivet that just barely falls within the limit range.
If you’d rather not search for the right rivet manually, there are several convenient alternatives. Many manufacturers offer online selection tools where you simply enter the grip range, material type, and other parameters—and the right rivet is suggested immediately. If you’d prefer personal advice, contact a specialty retailer or the manufacturer’s technical support directly.
A practical example is the Gesipa filter tool. Simply click on a rivet category, and a selection tool will guide you to the right blind rivet for your specific application.
