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You can contact us using any
of the methods below.
Unit 3 Durham Lane
Armthorpe
Doncaster
South Yorkshire DN3 3FE
England
+44 (0)1302 836010
+44 (0)1302 831555
sales@npfasteners.com
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© Northern Precision Ltd.
NORTHERN PRECISION LTD
Accreditations
Northern Precision Ltd operate a quality management
system in accordance with ISO 9001.
The ISO 9001 standard is recognised worldwide and
you can be assured of the benefits of working with a
certified company knowing that our management
systems are constantly assessed and improved.
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RoHS|WEEE Compliance
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statement
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Opening Hours
Mon - Fri 08:00 - 17:00
Registered in England & Wales
Company number 3275391
V.A.T Registration number
GB 684 1384 17
NORTHERN PRECISION LTD
Specialist Fasteners
for Sheet Metal
+44 (0) 1302 836010
+44 (0) 1302 831555
Tel:
Fax:
sales@npfasteners.com
Quality
Service
Reliability
Self-Clinching Fasteners
Broaching Fasteners
Arnold & Shinjo Fasteners
Rivet Bushes
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Materials, Composites &
Sandwich Panels
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Installation Equipment
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special parts made to order
Bespoke fastener design &
development
Fastener & Application
testing
Technical support
ISO 9001
RoHS|WEEE Compliance
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Conflict minerals
Environmental Policy
SERVICES & SUPPORT
Clinch Nuts
Flush Nuts
Blind Nuts
Miniature Nuts
Nyloc Nuts
Locking Nuts
Floating Nuts
Flush Head Studs
Flush Head Studs for
Stainless Steel
Reduced Flush Head Studs
Thin Panel Non-Flush Studs
High Strength Studs
Thin Panel High Strength
Studs
Flush Head Pins
Flush Head Tapered Pins
Concealed Head Studs
Through & Blind Standoffs
Grounding Standoffs
Thin Panel Standoffs
Quick Release Standoffs
Keylock Standoffs
Concealed Head Standoffs
Flush Panel Screw Assembly
Panel Fasteners
Phillips Head Panel Fasteners
Low-Profile Panel Fasteners
Plunger Assembly
Self-Clinching fastener
Do’s and Don’ts
Self-Clinching fastener
problem solving guides
Self-Clinch in harder panels
Performance
Testing Method
Push-out testing of Self-Clinching Locking Nuts should be performed
by the gradual application of a load as shown.
Bushing height should be sufficient to allow free downward
movement of the nut during testing. The bushing bore must be
centred on the head of the nut.
Torque-out testing of Self-Clinching Nuts should be performed
by the gradual application of torque as shown, while the test
panel is securely held in a vice.
Torque must be gradually applied until failure is observed and
a maximum applied torque reading is recorded. Failure mode
is the nut turning in the panel or cam-out.
All performance figures are averages obtained over a range of installations and should be used as
an indicator only. Panel material, hole preparation, installation tooling and method can affect part
performance. We always recommend that you carry out your own tests in the actual application.
Please call our sales team and we will be happy to provide you with samples as well as offering
technical assistance.
L
Min.
5.5
5.5
5.5
A
+0.12
6.33
4.98
7.88
Thread codes
M4
M3
M5
Anvil Dimensions
First punch or drill the correct size hole. Do not deburr or chamfer the
hole prior to installation as this will remove material required during
the clinching process. It is preferable to install the fastener from the
punch side of the panel.
Place the fastener in the anvil with the shank facing up like in the diagram above. Locate the panel mounting hole
over the shank ensuring the panel is held level.
Apply a parallel squeezing force until the head is seated against the panel with no serrations visible. Do not over
squeeze the fastener into the panel as this will result in panel deformation.
When installing Self-Clinching fasteners, please pay attention to the minimum hole centreline to edge and parent
material hardness limitations.
A
L
Break edge
0.13 x 45° Max.
Do not remove any extra material or
chamfer the hole as this could result in
improper installation or reduced
performance.
HRB (ROCKWELL HARDNESS B SCALE)
Ensure that you are installing into a
panel that is ductile and at or below the
published maximum recommended
hardness for the fastener.
Ensure that attention is paid to the
minimum hole centreline to edge
dimension for each fastener. Installing
too close to an edge or bend could result
in improper installation or reduced
performance. Minimum centreline to
edge dimensions shown for each
fastener apply to one edge only. If this
distance is applied on multiple sides
there will be significant panel distortion
unless the panel edges are supported
during installation.
Installation
Material & Finish
Zinc Plated Carbon Steel + Dry Film Lubricant coating (MD) parts are suitable for
installation in ductile panels with a maximum recommended hardness of 70 HRB.
300 Series Stainless Steel + Dry Film Lubricant coating (A2) parts are suitable for
installation in ductile panels with a maximum recommended hardness of 70 HRB.
Aluminium (AL) arts are suitable for installation in ductile panels with a maximum
recommended hardness of 50 HRB.
Part Number Examples
Part number is made up as follows:
(Type)-(Thread)-(Material code)-(Material/Finish code)
For example:
LCN-M3-1-MD (Locking Nut-M3-1.0mm min sheet thickness-zinc plated carbon steel plus
Dry Film Lubricant coating)
LCN-M4-2-A2 (Locking Nut-M4-1.4mm min sheet thickness-stainless steel plus Dry Film
Lubricant coating)
LCN-M5-2-AL (Locking Nut-M5-1.4mm min sheet thickness-aluminium)
Info
Self-Clinching Locking Nuts provide strong female prevailing torque locking threads in panels that are too thin to be
conventionally tapped.
Utilising a special proven clinch feature, this fastener has excellent torque-out and push-out characteristics whilst
providing a flush finish on the underside of the panel.
Featuring two symmetrically threaded jaws and a dry film lubricant coating to provide a strong and effective
prevailing torque locking action to minimise the risk of loosening when under heavy usage.
Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides of
the panel.
Locking Nuts are available in various thread sizes, manufactured from zinc plated steel and 300 series stainless
steel plus a dry film lubricant coating and are suitable for installation in ductile steel and aluminium panels with a
recommended maximum hardness of 70 HRB and aluminium with no dry film lubricant which are suitable for
installation in ductile aluminium panels with a recommended maximum hardness of 50 HRB.
Dimensional Data
Self-Clinching fastener
Do’s & Don’ts
Self-Clinching fastener
problem solving guides
Downloadable
Data Sheet
Back
SELF-CLINCHING
LOCKING NUTS
