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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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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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Inserts for Stone, Solid
Materials, Composites &
Sandwich Panels
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Fast-Con
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
REACH Compliance
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
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 hole with the shank facing down like in
the diagram above.
Ensuring the panel is held level, using a flat punch and flat anvil
apply a parallel squeezing force until the hexagon head is
embedded flush with the surface of the panel.
When installing Self-Clinching fasteners, please pay attention to
the minimum hole centreline to edge and parent material
hardness limitations.
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.
Bolt (Grade 5 min.) Ensure
full thread engagement
before applying load.
Hardened bushing with
sufficient wall thickness
to withstand applied
compression load.
Test panel.
Head Dia.
+ 1.6mm
Compression rig base.
Push-out testing of Self-Clinching Flush 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.
Testing Method
Material
code
1
2
1
2
1
2
1
2
1
2
1
2
1
2
3
4
Max. recommended
tightening torque for
mating screw (Nm)
0.23
0.36
0.36
0.40
0.58
0.88
0.16
3.70
Thread code
M2.5
M3
ALTM3
M3.5
M4
M5
M2
M6
5
Test sheet
material
Aluminium
Steel
Aluminium
Steel
Aluminium
Steel
Aluminium
Steel
Aluminium
Steel
Aluminium
Steel
Aluminium
Steel
Aluminium
Axial tensile
strength
(kN)
0.68
0.85
0.85
0.93
1.00
1.30
0.57
4.50
Steel
Installation
force (kN)
9
14
9
14
11
16
11
16
12
18
13
19
9
14
16
21
Push-out
(N)
880
950
880
950
1000
1200
1000
1200
1100
1400
1300
1500
880
950
2750
3700
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.
Installation
Material & Finish
300 series Stainless Steel (A2)
Suitable for installation in ductile material with a maximum recommended hardness of
70 HRB.
300 series stainless steel parts are not suitable for installation into stainless steel panels.
Please give us a call if you want to discuss your specific application.
Part Number Examples
Part number is made up as follows:
(Type)-(Thread code)-(Material code)-(Material/Finish code)
For example:
NF-M3-1-A2 (Flush Nut-M3-1.5mm min sheet thickness-stainless steel)
NF-M4-2-A2 (Flush Nut-M4-2.4mm min sheet thickness-stainless steel)
Info
Self-Clinching Flush Nuts provide strong reusable female 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 both sides of the panel.
Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides
of the panel.
Flush Nuts are available in various thread sizes, manufactured from 300 series stainless steel and are suitable for
installation in ductile steel and aluminium panels with a recommended maximum hardness of 70 HRB.
Dimensional Data
Self-Clinching fastener
Do’s & Don’ts
Self-Clinching fastener
problem solving guides
Downloadable
Data Sheet
Back
Performance
Type NF
SELF-CLINCHING
FLUSH NUTS
