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Product Tutorials: Lockbolts

What They Are

Designed for high strength, secure assembly.

Lockbolt systems are high strength, structural fasteners that are quick and simple to place yet last for years. They are the ideal solution where spot welding is not practical or possible and have been widely used for many years in demanding engineering industries throughout the world, including vehicle body building, railways, construction and containers.

  • High speed assembly
  • High shear and tensile strength
  • Consistent, high performance
  • Robust and rugged tools
  • Excellent vibration resistance
  • Ease of inspection



Lockbolts consist of these features:
Avdelok® / Maxlok®
A. Collar
B. Lockbolt (a.k.a. Pin)
C. Head (a.k.a. Flange)
Avbolt®
A. Collar
B. Sleeve
C. Stem (a.k.a. Mandrel)
D. Stem Head (a.k.a. Mandrel Head)



How They Work

Avbolt®
View an interactive demo

  1. The Avbolt® fastener is inserted into a prepared hole in the workpiece and the tool nose piece is placed over the Avbolt® stem.
  2. When the tool is activated, the jaws of the placing tool lock onto pulling serations on the stem and pull the stem axially forcing the outer nose casing against the collar.
  3. As the placing tool continues to pull the stem, the stem head is forced against the sleeve of the fastener causing the sleeve to collapse toward the rear sheet. A bulb formation forms against the rear application piece, firmly pulling/clamping the material sheets together.
  4. The nose casing then moves over the collar and toward the application. The collar is pressed against the grooves in the stem and material from the collar flows into the grooves locking the collar onto the stem.
  5. Additionally, material from the collar flows down the length of the collar toward the application to form a flange.
  6. The force required for the nose casing to travel over the collar increases throughout the placing action and accumulates at the stem breaker groove until finally the stress is so high that the stem breaks.


Avdelok® / Maxlok®
View an interactive demo

  1. The pin of the bolt is inserted into a prepared hole in the workpiece and the collar is placed over the pin from the other side.
  2. The tool nose piece is placed over the pin and when activated, the jaws of the placing tool lock onto pulling serations at the tail of the bolt and pull the bolt axially forcing the outer nose casing against the mating collar.
  3. As the placing tool continues to pull the bolt, the nose casing pushes the collar against the rear application sheet firmly pulling/clamping the material sheets together.
  4. The nose casing then moves over the collar and toward the application rear sheet.
  5. The collar is pressed against the rolled grooves and material from the collar flows into the grooves locking the collar onto the bolt.
  6. Additionally, material from the collar moves down the length of the collar toward the rear sheet to form a flange.
  7. The force required for the nose casing to travel over the collar increases throughout the placing action and accumulates at the break notch (Avdelok®) or at the groove closest to the collar (Maxlok®) until finally the stress is so high that the bolt breaks.



Lockbolt Styles

Avbolt®
The Avbolt® lockbolt combines the installation speed of blind products with the high tensile and shear strength normally only possible with non-blind lockbolts. The Avbolt® lockbolt is a high strength, tamper resistant structural fastener ideal for areas with restircted access or for use on blind sided applications. It's high grip capability suits a wide variety of material thicknesses, however, the application hole size and grip range must meet the specified ranges to ensure proper installation and performance.
  • Applications with restricted access
  • Blind sided applications
  • Varying grip range

Avdelok®
The Avdelok® lockbolt has a breaknotch (much like a breakstem rivet), which means it breaks at the same spot along the bolt length each time. In thin applications, the break surface may protrude outside the collar. The application hole size and grip range must meet the specified ranges to ensure proper installation and performance.
  • Controlled grip range
  • Strength critical applications



Avdelok® LD
The Avdelok® LD (Avdelok® Large Diameter) lockbolts are heavy duty, two piece fasteners designed to provide a high strength, secure assembly. The Avdelok® LD fastener is the perfect alternative to grade 8.8 threaded fasteners, providing a permanent, high tensile friction grip joint but without the risk of loosening.
  • Exceptional shear and tensile strength
  • Tamper resistant



Maxlok®
The Maxlok® lockbolt does not contain a break notch so it is a multi-grip fastener and is designed to break near flush with no more than 2 grooves within collar. Multi-grip means the bolt can accomodate materials or application components with widely varying thicknesses. This allows one bolt to do the job of two or more single grip range fasteners, thus reducing inventory, assembly time and cost.
  • Varying grip range
  • Replaces several single grip lockbolts (inventory reduction/cost savings)




Lockbolts

Brand Material Key Features
Steel Avbolt®
  • Blind rivet functionality in a structural bolt style fastener
  • Ideal for heavy duty applications

Aluminium
Steel
Stainless
Avdelok®
  • High shear strength
  • High controlled clamp

Steel Avdelok® LD
  • Large Diameter (LD) sizes from 13mm (1/2") to 28.6mm (1")
  • Exceptional shear and tensile strength

Aluminium
Steel
Maxlok®
  • Wide grip range
  • High shear strength



Lockbolt Selection

Accessibility
If there is only access from one side of the application, the Avbolt® lockbolt is the only choice. Avdelok® and Maxlok® lockbolts require access to both sides of the component.

Grip Range
The thickness of the parent material(s) must fall within the grip range of the lockbolt.

Hole Size
It is important to control the hole size accurately in order to ensure optimum lockbolt performance.

Corrosion Resistance
Corrosion is best reduced by selecting a lockbolt material which is the same as the parent material(s).

Strength Characteristics
Shear and tensile values for the selected lockbolt must fall within the application requirements.

Load Spreading
Select a lockbolt with a large flange head for use in thin or low strength materials.



Application

























Installation Tools

Tool Description
722 (Hydro-Pneumatic)
Places all 4.8mm (3/16) to 9.6mm (3/8) Avdelok® lockbolts and 6.4mm (1/4) Avbolt®.

73410 (Hydro-Electric)
Places all 22mm (7/8) to 25mm (1") Avdelok® lockbolts.

73411 (Hydro-Electric)
Places 4.8mm (3/16) to 9.5mm (3/8) Avdelok® lockbolts and 9.6mm (3/8) Avbolt®.

73412 (Hydro-Electric)
Places 13mm (1/2) to 19mm (3/4) Avdelok® lockbolts and 16mm (5/8) Avbolt®.

G2LB (Hydro-Pneumatic)
Places all 4.8mm (3/16") and 6.4mm (1/4") Avdelok® and Maxlok® lockbolts.

nG4 (Hydro-Pneumatic)
Places Up to 6.4mm (1/4") breakstem rivets produced by Avdel except Monobolt® structural rivets. Can also place: Avseal® II sealing plugs, up to 12 mm Avtainer® lockbolts, 9.5mm (3/8")Avdelok® and Maxlok® lockbolts 4.8mm (3/16") and 6.4mm (1/4")Hemlok® structural rivets 6.4mm (1/4").







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