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NP - Self Clinching Fasteners - Reduced Head Studs
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Self Clinching Reduced Flush Head Studs provide a strong torque resistant captivated male thread in thin panels.
Designed especially for applications requiring stud installation close to a bend or the edge of the panel.
As the name suggests Flush Head Clinch Studs install fully flush on the back of the panel meaning that minimal surface finishing is required after installation. The special castellated Clinch feature provides excellent torque out and push out resistance.
Available in Steel and Stainless Steel sizes M2.5 - M5.
Like all self clinching fasteners they are installed using a parallel squeezing action so require access to both sides of the panel.
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Thread
& Pitch |
D
± 0.4 |
H
Max |
Min Sheet
Thickness |
Hole Size
in Panel
+0.08 -0.0 |
Max
Mating Hole |
Min C/L to
edge of panel |
M2.5 x 0.45 |
3.15 |
2.1 |
1.0 |
2.5 |
2.9 |
2.8 |
M3 x 0.5 |
3.65 |
2.1 |
1.0 |
3.0 |
3.4 |
3.3 |
M3.5 x 0.6 |
4.15 |
2.3 |
1.0 |
3.5 |
3.9 |
3.8 |
M4 x 0.7 |
4.65 |
2.4 |
1.0 |
4.0 |
4.4 |
4.3 |
M5 x 0.8 |
5.90 |
2.7 |
1.0 |
5.0 |
5.4 |
5.6 |
Lengths |
Thread Size |
Length (L) ± 0.4 |
M2.5 |
6 |
8 |
10 |
12 |
15 |
18 |
- |
- |
- |
- |
M3 |
6 |
8 |
10 |
12 |
15 |
18 |
20 |
25 |
- |
- |
M3.5 |
6 |
8 |
10 |
12 |
15 |
18 |
20 |
25 |
30 |
- |
M4 |
6 |
8 |
10 |
12 |
15 |
18 |
20 |
25 |
30 |
35 |
M5 |
- |
8 |
10 |
12 |
15 |
18 |
20 |
25 |
30 |
35 |
Materials |
Finishes |
Carbon Steel
300 Series Stainless Steel (A2)
Aluminium (AL) (Special Order)
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Bright Zinc / Trivalent Clear Passivate (ZI)
Other finishes available to order
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The following installation panel material hardness
limitations apply when installing Self Clinching Studs.
Steel Clinch Studs: 80HRB Max
300 series Stainless Steel Clinch Studs: 70HRB Max
Aluminium Clinch Studs 50HRB Max
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Part Number Examples
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Type | Thread | Length | Finish
i.e. : NFHL-M3-10-ZI
(Reduced Clinch Stud-M3x10mm-Steel-BZP)
i.e. : NFHL-M4-20-A2
(Reduced Clinch Stud-M4x20mm-Stainless Steel)
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Installation Guide
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Thread Size |
Panel Thickness |
D
+ 0.08 |
C
+ 0.1 |
M2.5 |
1.50mm panel thicknesses & below
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2.53 |
3.1 |
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1.51mm panel thicknesses & over
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Not Required |
M3 |
1.5mm panel thicknesses & below
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3.03 |
3.6 |
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1.51mm panel thicknesses & over
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Not Required |
M3.5 |
1.50mm panel thicknesses & below
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3.53 |
4.1 |
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1.51mm panel thicknesses & over
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Not Required |
M4 |
1.50mm panel thicknesses & below
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4.03 |
4.6 |
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1.51mm panel thicknesses & over
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Not Required |
M5 |
1.50mm panel thicknesses & below
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5.03 |
5.6 |
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1.51mm panel thicknesses & over
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Not Required |
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 embedded flush in the panel.
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
Size |
Test
Panel |
Panel
Hardness
(HRB) |
Installation
(kN) |
Max Nut
Tightening
Torque (Nm) |
Torque
Out
(Nm) |
Pushout
(N) |
Pull
Through
(N) |
Pull Through
Test Bushing
Hole Size |
M2.5 |
1.1mm Steel |
53 |
5.2 |
0.41 |
1.12 |
454 |
2247 |
3.0mm |
1.2mm Aluminium |
33 |
3.0 |
0.41 |
0.53 |
289 |
1193 |
M3 |
1.1mm Steel |
53 |
5.3 |
0.74 |
1.31 |
471 |
2491 |
3.5mm |
1.2mm Aluminium |
33 |
4.4 |
0.46 |
0.62 |
288 |
1307 |
M3.5 |
1.1mm Steel |
53 |
6.5 |
1.15 |
1.76 |
498 |
2789 |
4.0mm |
1.2mm Aluminium |
33 |
4.5 |
0.58 |
0.80 |
292 |
1396 |
M4 |
1.1mm Steel |
53 |
6.7 |
1.70 |
2.08 |
551 |
3312 |
4.5mm |
1.2mm Aluminium |
33 |
5.3 |
0.75 |
1.21 |
368 |
1545 |
M5 |
1.1mm Steel |
53 |
19.8 |
2.25 |
4.36 |
994 |
3753 |
5.5mm |
1.2mm Aluminium |
33 |
11.4 |
1.11 |
2.21 |
532 |
1846 |
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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