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NP - Self Clinching Fasteners - Locking Clinch Nuts
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Self Clinching Locking Nuts provide a strong reusable female thread in panels that are too thin to be conventionally tapped. This fastener features two symmetrically threaded jaws to provide a strong and effective locking action whilst minimising the risk of loosening when under heavy usage.
Utilising a special proven clinch feature, they have excellent torque out and push out characteristics whilst installing flush on the underside 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.
Available in Steel, Stainless Steel and Aluminium in threads M3 - M5.
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Thread
& Pitch |
Material
Code |
Minimum
Sheet
Thickness |
S Max |
C Max |
D Max |
F Nom |
H ± 0.4 |
Hole Size
in Panel
+ 0.08 - 0.0 |
Max Prevailing
Locking Torque
(N.m) (guide) |
Min C/L to
edge of panel |
M3 x 0.5 |
1 |
1.0 |
0.97 |
4.73 |
4.85 |
6.35 |
3.43 |
4.75 |
0.56 |
4.0 |
2 |
1.4 |
1.38 |
M4 x 0.7 |
1 |
1.0 |
0.97 |
6.73 |
6.20 |
8.73 |
4.45 |
6.76 |
1.7 |
5.2 |
2 |
1.4 |
1.38 |
M5 x 0.8 |
1 |
1.0 |
0.97 |
7.90 |
7.75 |
9.53 |
5.21 |
7.92 |
2.0 |
5.6 |
2 |
1.4 |
1.38 |
*Made to Order
Materials |
Finishes |
Carbon Steel
300 Series Stainless Steel (A2)
Aluminium (AL)*
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Bright Zinc / Clear Passivate (ZI)
Also available with a Dry Film Lubricant (MD)
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Maximum hardness of parent material : Steel and Stainless
Steel parts - 70HRB : Aluminium - 50 HRB. Please note that
Stainless Steel parts cannot usually be successfully installed
into Stainless Steel Sheet.
(See Self Clinch technical notes page for further details)
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Part Number Examples
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Type | Thread | Material Code | Finish
i.e. : LCN-M3-1-ZI
(Locking Clinch Nut-M3-1mm Min Sheet-Steel-BZP)
i.e. : LCN-M4-2-A2
(Locking Clinch Nut-M4-1.4mm Min-Sheet-Stainless)
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Installation Guide
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Thread Size |
D Dim - Add 0.13 to 0.25mm |
M3 |
4.85 |
M4 |
6.20 |
M5 |
7.40 |
First punch or drill the correct size hole. DO NOT deburr the hole prior to installation as this will remove material required during the clinching process. It is preferable to install the fastener from the side of the panel with the burring or blow through.
Place the fastener in the hole like in the diagram above making sure the part is seated squarely.
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 the threads being crushed.
When installing Self Clinching fasteners, please pay attention to the minimum hole centerline to edge and parent material hardness limitations.
For special applications or if you are unsure of any aspect about the usage or installation of this fastener, give our sales office a call and we will do our best to offer you a solution or give advice on your application.
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Performance Data
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Thread |
Material
Code |
Max prevailing
torque in locking
feature (Nm) |
Test Panel Material |
Aluminium |
Steel |
Installation
(kN) |
Pushout
(N) |
Torque out
(Nm) |
Installation
(kN) |
Pushout
(N) |
Torque out
(Nm) |
M2.5 |
1 |
0.45 |
7 |
578 |
2.8 |
13.5 |
665 |
3.4 |
2 |
9 |
890 |
3.9 |
13.5 |
1110 |
4.5 |
M3 |
1 |
0.56 |
7 |
578 |
2.8 |
13.5 |
665 |
3.4 |
2 |
9 |
890 |
3.9 |
13.5 |
1110 |
4.5 |
M4 |
1 |
1.7 |
12 |
665 |
5.0 |
18 |
845 |
5.6 |
2 |
12 |
1110 |
5.6 |
18 |
1330 |
7.9 |
M5 |
1 |
2.05 |
12 |
665 |
10.1 |
18 |
1110 |
11.3 |
2 |
12 |
1110 |
11.8 |
19 |
1330 |
13.5 |
The above data is based on average values obtained in a test environment. Variations in hole size, panel material and installation will effect performance. It is recommended that you carry out your own performance tests in the actual application. Contact our sales department who will be happy to supply samples free of charge.
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