Huck LockBolts0 pages

How It Works

Huck Tooling Systems

Huck Lockbolts

Huck Structural Blind Fasteners

Clamp Force or Pre–Load: In the initial stages of the installation process, the
tool engages and pulls on the pintail. The joint is pulled together before the conical
shaped cavity of the nose assembly is forced down the collar. This progressively locks
(swages) it into the grooves of the harder pin. The pin and swaged collar combine to
form the installed fastener.

The shear strength of structural blind fasteners is generated by the combined
resistance against failure of the pin and sleeve. This takes place along the joint’s
shear line between fastened plates.

The squeezing action reduces the diameter of the collar, increasing its length. This in
turn stretches the pin, generating a clamp force over the joint.

The tensile strength of structural blind fasteners differs to that of Lockbolts,
as they form a blind side positive lock either by bulbing or expanding of the sleeve.
The sleeve, assisted by the permanently secured pin, therefore resists failure along
its centre line.

Shear strength of Lockbolts vary according to the material strength and minimal
diameter of the fastener. By increasing the diameter or the grade of material, the
shear strength of the fastener can be increased.

Head

Tensile
Centre Line

Shear

2. Expanding – pulling on the pintail causes the head of the pin to draw into the
sleeve. This expansion causes a foot print to form against the joint material.

Installation Tool – Either pneumatic or hydraulic
Powerig® – To supply power to hydraulic tools

202V

Additional Hose Set – Sometimes required to
connect hydraulic tools to the Powerig

With production resources across the globe, AFS provide engineered,
high-quality, high-performance fastening systems for a variety of
industrial applications.

Solution Needed, Solution Provided
Make our engineers part of your team at the concept stage. Their unrivalled knowledge of advanced fastener function can make the impossible
possible. A standard fastener in our range may provide your answer. If not, we can produce a cost-effective tailor-made solution.

2628
2025LB

Shear Line

Tensile

In 2000 Alcoa, the world’s leading producer of primary aluminium,
fabricated aluminium and alumina became Huck’s parent company.
In 2002 they acquired Fairchild Fastening Systems and joined the two
fastening institutions together to create Alcoa Fastening Systems (AFS),
with Huck fasteners as a branded product.

Today the product range based on his original drawing of a Lockbolt
now known as the HuckBolt® has evolved to include small and large
diameter fasteners, medium and heavy duty blind fasteners and
associated installation tooling.

Nose Assembly – To match with the fastener and tool

Note: The pre-load of blind rivets is generally not published, as it varies widely
depending on the application
Pintail

For more than 60 years, the business Lou Huck founded and the
fasteners he designed are still solving the problem of coping with
extreme stress and vibration, providing strength and facilitating lighter,
stronger, more durable structures.

The basic tooling requirements to install Huck fasteners:

1. Bulbing – the sleeve of the fastener is compressed, causing it to fold outwards
to form a bulb. This forms itself tightly against the joint material. Once the pin is
permanently locked into place the pintail will break off, completing the installation.

The tensile strength of Lockbolts is dependent on the shear resistance of the
collar material and the number of grooves it fills.

The Unshakeable World of Huck Fastening Systems

Many different types of Huck installation tooling systems are available. Some of the most popular tools are shown below, but this is just a small
part of our range. Discuss your requirements with our dedicated Systems Engineering Team to find the optimum solution to suit your
need.

The Huck Fastening System – Key Benefits:

Pneudraulic installation tool
with vacuum pintail collection
bottle. Installs 4.8 & 6.4mm
structural blind rivets.

Shear

Centre Line

Pin

Shear Line

❚

Will not loosen even under extreme vibration

❚

High speed, easy to install systems can reduce production time by 75%

❚

Maintenance free joints – no need to torque or re-torque

❚

Improves health and safety - replace welded joints

❚

Pin

Lower lifetime total cost of joint - high shear and tensile strengths
for increased fatigue life of the joint

❚

Tamperproof – once installed cannot be removed without
specialist tooling

t
Collar

Breakneck
groove
Internal
Lock

Sleeve

Pintail

Pintail-less Lockbolt
after installation

Lockbolt after
installation

Bulbing (Magna Bulb)

Head of pin

Expanding (HuckLok)

Hydraulic installation tool.
Installs 14, 15.9,16 & 19.1
mm large diameter Lockbolts
and 15.9 & 19.1 mm BOM
structural blind rivets.

Pneudraulic compact powerful
installation tool with pintail
bottle. Installs 4.8 & 6.4 mm
small diameter Lockbolts and
structural blind rivets.

Lockbolt installation sequence

2480L
2503

2 • Tool is placed over the fastener pintail and activated
• Pin head pulled against material
• Anvil pushes collar against joint
• Initial clamp generated

3 phase electric, portable design.
The Powerig can be used will all
hydraulic installation tools.

4 • Pintail breaks, installation complete

1

2

3

• Tool activated
• Deforming of blind side begins
• Joint tightened
• Internal locking mechanism formed

4t
4

• Pintail breaks, installation complete

Hydraulic compact installation
tool; high speed & high durability.
Ideal for high volume production
to install 4.8 & 6.4 mm small
diameter Lockbolts and structural
blind rivets.

Hydraulic installation with
extra long stroke. Ideal for
installing 9.5mm Magna-Lok
and 7.9 mm Floortight.

• Pin placed into prepared hole
• Tool is placed over the fastener pintail

3t
3
t

HSSFT-M16UK

4

Blind Fastener installation sequence

2t
2
t

Contact
Alcoa Fastening Systems
Telford Operations,
Unit C, Stafford Park 7
Telford
TF3 3BQ
England
Tel : +44 (0) 1952 290011
Fax : +44 (0) 1952 204670
Email : info@huckfasteners.net
Web : www.afshuck.net

Alcoa Fastening Systems
Kelkheim Operations,
Industriestr. 6
65779 Kelkheim
Germany
Tel : +49 (0) 6195-805-0
Fax : +49 (0) 6195-2001

HK432-2 Shown cannot install Huck-Spin or BobTail

3 • Tool swages collar, increasing clamp

1
1t
t

The Huck®
Product Range

HK432 Series

Installation Sequence
1 • Pin placed into prepared hole
• Collar placed over pin

Will also install 7.9 and
9. 5mm Lockbolts &
Structural blind rivets.

1

2

3

Hydraulic installation tool,
compact swage forward
design. Installs 14 & 16 mm
Huck-Spin Lockbolts.

4

Alcoa Fastening Systems
St Cosme Operations,
9 rue de Cressonnieres
72110 Saint Cosme en Varais
France
Tel : +33 (0) 2.43.31.41.00
Fax : +33 (0) 2.43.31.41.41

TS 504575-000
FM 80437

Disclaimer:
The information contained in this publication is only for general guidance with
regard to properties of the products shown and/or the means for selecting such
products, and is not intended to create any warranty, express, implied, or statutory;
all warranties are contained only in AFS’s written quotations, acknowledgments,
and/or purchase orders. It is recommended that the user secure specific, up-todate data and information regarding each application and/or use of such products.
AFS HA16 AUG 2008
©2008 Alcoa Fastening Systems Ltd. All rights reserved.

www.afshuck.net | info@huckfasteners.net

www.afshuck.net | info@huckfasteners.net

www.afshuck.net | info@huckfasteners.net

EMS 60542