NP
Contact us You can contact us using any of the methods below. Unit 3 Durham Lane Armthorpe Doncaster South Yorkshire DN3 3FE England +44 (0)1302 836010 +44 (0)1302 836012 sales@npfasteners.com
All rights reserved © Northern Precision Ltd.
NORTHERN PRECISION LTD
Accreditations Northern Precision Ltd operate a quality management system in accordance with ISO 9001:2008. The ISO 9001:2008 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.
Registered in England & Wales Company number 3275391
V.A.T Registration number GB 684 1384 17
NP
NORTHERN PRECISION LTD
Specialist Fasteners for Sheet Metal
+44 (0) 1302 836010
+44 (0) 1302 836012
Tel:
Fax:
sales@npfasteners.com
Quality
Service
Reliability
Northern Precision Ltd YouTube Channel Self Clinching Nuts
Type NS
Steel and 300 Stainless Steel Clinch Nuts Performance
Thread code
M2|M2.5|M3
Material code
Test sheet material
Installation force (kN)
0
1
Aluminium
6 - 9
2
0
1
Steel
11 - 16
2
Push-out (N)
Torque-out (Nm)
285
410
770
485
570
1035
0.9
1.2
1.5
1.5
1.8
2.0
ALTM3|M3.5
0
1
Aluminium
11 - 14
2
0
1
Steel
13 - 27
2
290
415
850
490
580
1230
1.8
2.0
2.5
1.8
2.3
2.3
M4
0
1
Aluminium
11 - 14
2
0
1
Steel
17 - 28
2
310
490
980
495
655
1250
2.4
2.6
4.0
3.0
4.1
5.0
M5
0
1
Aluminium
11 - 16
2
0
1
Steel
18 - 40
2
320
510
990
535
815
1285
3.0
3.6
5.8
3.6
4.5
6.8
M6
0
1
Aluminium
17 - 32
2
0
1
Steel
26 - 38
2
990
1590
1600
1395
1760
1775
7.9
10.1
14.3
13.0
17.1
17.1
M8
1
2
Aluminium
18 - 33
1
2
1580
1600
1875
1890
13.5
18.2
18.9
20.1
Steel
26 - 38
2
M10
1
2
Aluminium
21 - 37
1
2
1690
1780
1965
2050
31.5
33.0
35.9
36.5
Steel
32 - 50
ALTM10
1
2
Aluminium
20 - 35
1
2
-
-
1910
-
-
30.0
32.5
33.0
Steel
29 - 45
1620
1695
2020
28.5
M12
1
1
Aluminium
30 - 42
2125
4700
39.0
84.0
Steel
44 - 70
400 Stainless Steel Clinch Nuts Performance
Thread code
M3
Material code
Test sheet material
Installation force (kN)
1
2
304 Stainless Steel
40
1
2
1
46
2
Push-out (N)
Torque-out (Nm)
720
1300
820
1630
1300
1780
1.9
2.1
4.2
5.1
5.1
7.0
44
304 Stainless Steel
M4
M5
304 Stainless Steel
44
50
51
1
60
2
M6
304 Stainless Steel
65
2050
2610
17.2
19.5
1
66
2
M8
304 Stainless Steel
80
2250
4620
19.8
23.5
1
80
M10
304 Stainless Steel
2500
38.7
Aluminium Clinch Nuts Performance
Thread code
M3
Material code
Test sheet material
Installation force (kN)
1
2
Aluminium
3.5 - 6.5
1
2
Push-out (N)
Torque-out (Nm)
440
540
530
760
0.7
1.0
3.1
3.2
4.0 - 6.8
Aluminium
M4
4.4 - 6.9
5.7 - 8.0
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.
Testing Method
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.
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.
Bolt (Grade 5 min.) A minimum of 2 threads should extend past the end of the fastener.
Test panel held firmly in vice.
Applied torque from dial measuring torque wrench.
Flat washer 2 pitch min.
Push-out testing of Self-Clinching 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.
Torque-out testing of Self-Clinching Nuts 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 nut turning in the panel or cam-out.
X
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.
X  √  Min C/L to Edge Min C/L to Edge
Material & Finish
Electro Zinc Plated Carbon Steel (ZI) parts are suitable for installation in ductile panels with a maximum recommended hardness of 80 HRB. 300 Series Stainless Steel (A2) part are suitable for installation in ductile panels with a maximum recommended hardness of 70 HRB. 400 Series Stainless Steel (400) parts are suitable for installation in ductile panels with a maximum recommended hardness of 90 HRB. Aluminium (AL) parts are suitable for installation in ductile panels with a maximum recommended hardness of 50 HRB.
Part Number Examples
Part number is made up as follows: (Type)-(Thread code)-(Material code)-(Material/Finish code) For example: NS-M3-0-ZI (Clinch Nut-M3-0.8mm min. sheet thickness-electro zinc plated carbon steel) NS-M4-2-A2 (Clinch Nut-M4-1.4mm min. sheet thickness-stainless steel) NS-M5-1-AL (Clinch Nut-M5-1.0mm min. sheet thickness-aluminium)
RoHS REACH COMPLIANT
Installation
Info
Self-Clinching 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 the underside of the panel.   Like all self clinching fasteners they are installed using a parallel squeezing force so require access to both sides of the panel.   Clinch Nuts are available in various thread sizes, manufactured from electro zinc plated steel, 300 and 400 series stainless steel, and aluminium and are suitable for installation in ductile steel and aluminium panels with a recommended maximum hardness of 80 HRB for steel parts, 70 HRB for 300 series stainless steel parts, 90 HRB for 400 series stainless steel parts and 50 HRB for aluminium parts.
B -0.03
1.35
1.15
1.75
1.15
3.80
1.75
6.35
5.00
8.75
5.75
A ±0.05
7.57
6.78
8.38
7.57
11.53
9.17
7.62
13.13
9.53
7.62
Thread codes
ALTM3
M2|M2.5|M3
M4
M3.5
M6
M5
M10
M8
M12
ALTM10
Anvil type
Pocket Protrusion
Anvil Dimensions Steel & Stainless Steel Clinch Nuts
Dimensions are in mm.
B -0.03
1.15
1.15
3.55
1.75
3.80
A ±0.05
7.57
6.78
9.96
8.38
11.53
Thread codes
M3.5
M2|M2.5|M3
M5
M4
M6
Anvil type
Pocket
Anvil Dimensions Aluminium Clinch Nuts
Performance
clinch nuts
SELF-CLINCHING NUTS
A B A B
Pocket Anvil
Protrusion Anvil
ANVIL PUNCH ANVIL PUNCH