Product Announcement from Henrob Corp.

Rivet Types for Many Applications-Image

Rivet Types

There are five families of Henrob Self-Pierce Rivets. Each family is defined by unique geometry and has a range of macro features including head style, stem diameter and stem length. The five groups have been specifically developed to meet different functional requirements and application performances.

Rivet Type Selection

The choice of rivet type for a given application is dependent on numerous performance criteria - see Joint Development for details. Henrob Application Engineers select a rivet, in conjunction with appropriate tooling, to match the application characteristics such as the examples listed below:

Typical Application Characteristics:

Material Types, i.e. Aluminium, Steel, Plastic, Composite

Material - High Ductility, i.e. Cold Rolled Steel Sheet, Alu Sheet

Material - Reduced Ductility, i.e .Hot Rolled Steel, Extrusions, Castings

Material - Low Tensile Properties, i.e. Mild Steel, Non-Ferrous Alloys, Plastic

Material - High Tensile Properties, i.e. HSLA Steel, DP & TRIP Steels

Total Joint Thickness, i.e. 1mm to 6mm (Steel) & 1mm to 10mm (Alu)

Mixed Material Combinations, i.e. Plastics to Metal, Alu to Steel

Structural, i.e. Vehicles, Buildings

Non-Structural, i.e. Furniture, Cabinets, Attachments

Head Styles

Head styles are selected on the basis of either functional requirements or aesthetic appeal. Functional requirements may be:

  • Head flushness (level with material surface)
  • Shear, peel and fatigue strength
  • Locator or mechanical stop
  • Large bearing surface
  • Attachment points for secondary parts

Countersunk Head

Benefits:

  • Flushness on the head side of the joint
  • Good fatigue resistance

Flat, Pan and Dome Head

Benefits:

  • Provides good peel strength, especially in plastics or thin sheet metals
  • Allows good head seating, especially when riveting thick or very hard materials
  • Accentuates the aesthetics of a riveted joint and/or covers surrounding indentation on a Class A surface

Special Head Styles

Special rivet head styles are supplied when there is a need to combine the functions of the Self-Pierce Rivet and an additional feature, such as Threaded Studs, Plain Stand Off Pins and T Studs.

Rivet Length & Stem Diameter

Rivet length is always matched to the stack thickness to be fastened. A given rivet length will cover a range of material stacks. Testing is carried out to determine the suitability of the rivet length for the material and thickness range being riveted. Henrob offers rivets in lengths of 4 to 14mm.

There are two standard diameters, 3mm and 5mm. The criteria for selecting the appropriate rivet diameter includes:

  • Required strength of joint
  • Required robustness of joint
  • Available access to joining area
  • Material thickness and hardness

Contact us for a free evaluation to confirm that our process is suitable for your application.

 
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