Rivet selection factors to consider

 

1. Joint Strength

Shear and tensile force values are two factors for total joint strength. Refer to the “Shear”     and

“Tensile”   columns on each product, and select a FAST-TECH rivet that provides the values you require. Rivet material and size are also key factors affecting joint strength.

 

2. Joint Thickness

Measure the total thickness of the materials to be joined. This determines the required grip of the rivet you select. Refer to the “Grip Range”    column and select a FAST-TECH rivet with a grip range that includes the work thickness required. Remember that insufficient grip

 

range selection will not allow proper formation of the secondary head at the back of the work.

 

3. Nature Of Materials

Both the rivet and the materials to be fastened will affect the ultimate joint strength. As a general rule the rivet and materials to be fastened should have the same physical and mechanical properties. Dissimilarity between rivet and materials to be fastened may cause joint failure due to material fatigue or galvanic corrosion.

 

4. Hole Size

Hole size is an important factor to consider. Too small hole makes rivet insertion difficult. Too large hole will reduce the shear and tensile strengths and it may even cause bulging or separation of the members by allowing the rivet to expand between them instead of on the blind side. Best practice is to follow the “Hole Size”   recommendations provided. Also it is recommended to avoid burrs in and around the holes.

 

5. Head Style

The low-profile dome head is appropriate for most applications. However, when soft or brittle materials are fastened to a rigid backing member, the large flange head should be considered. When a flat surface is required, countersunk head style should be selected.

 

Dome Head Rivet

With its neat appearance and low profile, this is the most versatile and most commonly specified head style. The dome head has twice the diameter of the rivet body, providing enough bearing surface for use in all but extremely soft or brittle materials.

 

Large Flange Rivet

Large Flange rivets have twice the under-head bearing surfaces of comparable dome head rivets and are designed for applications where soft or brittle materials must be assembled to a rigid backing material.

 

Countersunk Rivet

This head design is specified wherever a flat surface is required.