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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.
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Registered in England & Wales
Company number 3275391
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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
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SERVICES & SUPPORT
Clinch Nuts
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Self-Clinching fastener
Do’s and Don’ts
Self-Clinching fastener
problem solving guides
Self-Clinch in harder panels
Testing Method
Hardened bush.
A minimum of 6 fully
engaged threads is
recommended on
both sides.
Test panel held
firmly in vice.
Applied torque
from dial measuring
torque wrench.
Minimum grade 5
bolt (grade 8 for
NHTS & NHFE
fasteners).
Torque-out testing of Self-Clinching Thin Panel High Strength
Studs should be performed by the gradual application of
torque as shown while the test panel is securely held in a vice.
The bolt must be of a sufficient grade to resist thread
stripping.
Torque must be gradually applied until failure is observed and
a maximum applied torque reading is recorded. Failure mode
is the stud turning in the panel, cam-out, or dependent on
stud type/size, thread failure.
Pull-through test for Self-Clinching
Thin Panel High Strength
Studs should be performed by the gradual application of an
axial load as shown.
A hardened bushing with a through-hole 0.5mm greater than the diameter of the thread should be centred over the
stud and inserted into the test rig lower link. A hardened threaded bushing should be inserted into the test rig upper
link and screwed down onto the stud. An axial load is then gradually applied on a tensile testing machine to separate
the links until a failure point is reached.
Please note that the pull-through values obtained during this test do not indicate the axial strength of the stud threads.
Pull-through values pertain only to the amount of force required to pull the stud through the panel.
Tensile testing rig
upper link
Tensile testing rig
lower link
Hardened bushing
Hardened threaded bushing.
A minimum of 6 fully engaged
threads is recommended.
Applied Load.
Torque-through testing of Self-Clinching Thin Panel High Strength Studs should be performed by the gradual application of
torque as shown while the test panel is securely held in a vice. The hex nut must be of sufficient grade to resist thread
stripping.
Torque must be gradually applied until failure is observed. Failure mode may vary depending on fastener type, size, length
and the properties of the panel the part is installed into. The fastener may actually fracture instead of the head pulling
through the panel.
Please note that the torque-through values obtained during this test do not indicate the axial strength of the stud threads,
the allowable nut tightening torque or the design loading of the assembled component. Torque-through values pertain only
to the amount of torque required to pull the stud through the panel.
M5 - 7.30mm
M6 - 8.30mm
M8 - 10.30mm
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 prepared hole in the panel and then locate the fastener in the anvil like in the
diagram above.
With the panel held level, apply a parallel squeezing force until the castellations are fully embedded in the
panel. This fastener is not designed to install flush, correct installation should leave the head protruding
slightly (refer to S dimension). Do not over install 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.
Performance
Thread
size
M5
Installation
(kN)
Torque-out
(Nm)
Pushout
(N)
38
Pull-thru
(N)
690
8.1
9.7
51
1350
8.1
10.6
M6
39
750
11.8
1402
60
1400
14.4
15.5
M8
42
1230
23.5
25.0
71
2400
33.9
27.5
1.0mm Aluminium
Test sheet
material
1.0mm Steel
1.0mm Aluminium
1.0mm Steel
1.5mm Aluminium
1.5mm Steel
Max. nut
tightening
Torque (Nm)
4.4
10.0
21.7
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
Anvil Dimensions
A
+0.08
6.03
5.03
8.03
Thread
size
M6
M5
M8
C
+0.2
11.75
10.00
15.75
D
+0.03
1.39
1.17
2.00
B
+0.1
6.60
5.60
8.60
Pocket punch detail. Pocket
provides clearance for head
protrusion, minimising risk of
over installation.
Countersunk hole style anvil
for 1.50mm or less panel
thickness for thread sizes M5
and M6 and 1.90mm or less
panel thickness for thread size
M8.
Straight thru hole style anvil for
1.51mm minimum panel
thickness for thread sizes M5
and M6 and 1.90mm minimum
panel thickness for thread size
M8.
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.
Material & Finish
Electro Zinc Plated through-hardened Steel (ZI) parts are suitable for installation in
ductile panels with a maximum recommended hardness of 85 HRB.
Part Number Examples
Part number is made up as follows:
(Type)-(Thread)-(Length)-(Material/Finish code)
For example:
NHFE-M6-20-ZI (Heavy Duty Stud-M6-20mm long-electro zinc plated through-hardened
steel)
Use part designation NHTSD to specify a dog-point thread lead-in (special order).
Info
Self-Clinching Thin Panel High Strength Studs provide high strength captivated male threads in panels as thin as
1.0mm. This fastener does not install fully flush on the underside of the panel.
Utilising a special proven castellated clinch feature and a larger diameter head, this fastener has very high torque-
out, pull-through and push-out characteristics whilst providing minimal protrusion on the underside of the panel
(refer to S dimension).
Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides of
the panel.
Thin Panel High Strength Studs are available in a range of thread sizes and lengths, manufactured from electro zinc
plated through-hardened steel and are suitable for installation in ductile panels with a recommended maximum
hardness of 85 HRB.
Thin Panel High Strength Studs can also be supplied with a dog-point thread lead-in to aid component assembly.
Dimensional Data
Self-Clinching fastener
Do’s & Don’ts
Self-Clinching fastener
problem solving guides
Downloadable
Data Sheet
Back
Type NHFE
SELF-CLINCHING
THIN PANEL
HIGH STRENGTH STUDS
A
Length of stud
+3.2mm min.
A
Length of stud
+3.2mm min.
90°
B
Hardened bushing with
sufficient wall thickness
to withstand applied
compression load.
Head Dia.
+ 1.6mm
Test panel.
Compression rig base.
Push-out testing of Self-Clinching Thin Panel High Strength
Studs should be performed by the gradual application of a
load as shown above.
Bushing height should be sufficient to allow free downward
movement of the stud during testing. The bushing bore must
be centred on the head of the stud.
Major Thread
Dia. + 0.08mm
M5 - 7.30mm
M6 - 8.30mm
M8 - 10.30mm
At Least 2 x minimum
recommended panel
thickness for part.
Axial pull-through (kN) load can be calculated by dividing the torque result (Nm) by (0.2 x major dia. of thread).
Hardened Hexagon Nut
Hardened counter-bored
bushing.
Test panel held
securely in vice.
