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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
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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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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
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Self-Clinching Fasteners
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development
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Technical support
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SERVICES & SUPPORT
Clinch Nuts
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Panel Fasteners
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Self-Clinching fastener
Do’s and Don’ts
Self-Clinching fastener
problem solving guides
Self-Clinch in harder panels
Installation
ANVIL
PUNCH
ANVIL
PUNCH
Self-Clinching Flush Retainer
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 round
head is embedded flush with the surface of the panel.
Self-Clinching Receptacle Nuts
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 and possibly thread deformation.
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.
Dimensions are in mm.
B
±0.05
5.72
5.72
5.72
A
±0.05
9.17
7.57
9.60
Thread
codes
M4
M3
M5
Anvil
type
Anvil Dimensions
Self-Clinching Receptacle Nuts
Performance and Testing Method
NR
Retainer
Thread
Size
M5
M4
M3
Installation
(kN)
18.5
15.5
13.5
Installation
(kN)
10.5
9.5
9.5
Aluminium
Cold-Rolled Steel
Test Panel Material
NRN
Receptacle
Nut
Thread
Size
M5
M4
M3
Installation
(kN)
30
22
15
Pushout
(N)
530
485
420
Installation
(kN)
15.6
13.2
11.0
900
Pushout
(N)
800
575
Aluminium
Cold-Rolled Steel
Test Panel Material
Bolt (Grade 5 min.) Ensure
full thread engagement
before applying load.
Hardened bushing with
sufficient wall thickness
to withstand applied
compression load.
Body Dia.
+ 1.6mm
Test panel.
Applied Load from
compression gauge.
Compression rig base.
Push-out testing of Self-Clinching Receptacle 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.
Retainer
Installation
Receptacle Nut
Installation
Material & Finish
Flush Mounted Panel Screw
300 Series Stainless Steel (A2).
Self-Clinching Flush Mounted Retainer
300 Series Stainless Steel (A2) parts are suitable for installation in ductile panels with a
maximum recommended hardness of 70 HRB.
Self-Clinching Receptacle Nut
Electro Zinc plated Carbon Steel (ZI) parts are suitable for installation in ductile panels
with a maximum recommended hardness of 80 HRB.
Part Number Examples
Flush Mounted Panel Screw
Part number is made up as follows: (Type)-(Thread)-(Screw Length Code)-(Material/Finish)
For example: NP10-M3-40-A2 (Flush Mounted Panel Screw-M3-Screw Length Code 40-
stainless steel)
Self-Clinching Flush Mounted Retainer
Part number is made up as follows: (Type)-(Thread)-(Material/Finish)
For example: NR-M4-A2 (Self Clinching Flush Mounted Retainer-M4-stainless steel)
Self-Clinching Receptacle Nut
Part number is made up as follows: (Type)-(Thread)-(Minimum Panel)-(Material/Finish)
For example: NRN-M5-1-ZI (Self Clinching Receptacle Nut-M5-1mm minimum panel
thickness-electro-zinc plated steel)
Info
Self-Clinching Panel Screw Assemblies utilise a self-clinching Retainer (NR) to allow a Panel Screw (NP10) to be flush
mounted in thin sheet metal panels, while remaining captive in the retainer when disengaged from the mating
component. A self-clinching Receptacle Nut (NRN) is used in the mating component.
Like all self-clinching fasteners, the retainer and receptacle components are installed using a parallel squeezing
action, so require access to both sides of the panel.
Panel Screws are manufactured from 300 series stainless steel. Self-clinching Retainers are manufactured from 300
series stainless steel and are suitable for installation in ductile panels with a recommended maximum hardness of
70 HRB. Self-Clinching Receptacle Nuts are manufactured from electro-zinc plated carbon steel and are suitable for
installation in ductile panels with a recommended maximum hardness of 80 HRB.
Dimensional Data
Self-Clinching fastener
Do’s & Don’ts
Self-Clinching fastener
problem solving guides
Downloadable
Data Sheet
Back
Types NP10 | NR | NRN
SELF-CLINCHING
PANEL SCREW ASSEMBLY
