Sealed [Closed] Blind Rivets
CLOSED End “CUP”
Also known as Sealed Blind Rivet.
Designed with a completely closed body, this rivet is ideal for applications that need to be water/pressure tight or where mandrel retention is paramount.
Used for providing a leak-proof joint.
Head Styles
Dome Head
Dome Headed or sometimes called Round head blind rivet is the most versatile and commonly used type whose lower profile head is approx. twice the diameter of the rivet body.
This provides adequate bearing surface for nearly all applications where metals are being joined.
Available in a number of material combinations.
Aluminium:
Aluminium-Steel – Lightweight and inexpensive. Easily available. Has low strength. Rivets can tear/fail with load.
Aluminium-Aluminium – Extremely lightweight and useful for Aerospace applications. Low strength. Usage must be carefully planned for load.
Aluminium – Stainless Steel – This combination has excellent corrosion resistance and better strength. Offers a flexible option for many situations.
Steel:
Steel-Steel – Good strength and relatively low cost of rivet. As the rivet body is Steel they are subject to corrosion.
Stainless Steel – Stainless Steel – Has excellent corrosion resistance and high strength. Rivets are relative expensive and require stronger tools for installation.
Stainless Steel – Steel – This combination permits easier installation because the steel mandrel breaks easily compared to an SS one. Reduced cost as compared with SS mandrel.
Copper:
Copper-Steel – Use where electrical conductivity is required.
Copper-Stainless Steel – Use where electrical conductivity and corrosion resistance is required.
CSK Head
Countersunk or CSK head profile provides a neat and flush finish to the joint.
This enables multiple layered assembly and also a safe surface without any projection.
Available in a number of material combinations.
Aluminium – Aluminuim Download-Datasheet AL-AL
Aluminium – Steel Download-Datasheet AL-ST
Aluminium – Stainless Steel Download-Datasheet AL-A2
Stainless Steel – Stainless Steel Download-Datasheet A2-A2
Material Usage Guide
Galvanic Corrosion • When dissimilar metals come into contact in the presence of an electrolyte, a galvanic action occurs which corrodes one metal at a faster rate and the other more slowly. This phenomenon can cause major riveted joint failures and care must be taken to avoid the occurrence. The following table is a guide.
| METAL JOINED | |||||
| RIVET MATERIAL↓ | Aluminium | Coated Steel | Stainless Steel | Copper | Brass |
| Aluminium | YES | CARE | NO | NO | NO |
| Coated Steel | NO | YES | NO | NO | NO |
| Stainless Steel | CARE | CARE | YES | YES | YES |
| Copper | NO | NO | YES | YES | YES |
| Monel | NO | NO | YES | YES | YES |
| YES | Compatible | ||||
| NO | Incompatible – Avoid contact with each other | ||||
| CARE | Use with care. Painting metals will help | ||||
Hence,
1) Select materials that are as close together as possible in the Galvanic
Series Chart
2) Provide a barrier between the two metals, such as paint, non-metallic
washer or gaskets
3) Design the fastener as the cathode so the cathodic area is small as
compared to the anodic area
4) Use a metallic finish on the fastener that is close on the chart to the
mating material