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
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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 ANVIL PUNCH ANVIL PUNCH
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 hexagon head is embedded flush with the surface of the panel.   When installing Self-Clinching fasteners, please pay attention to the minimum hole centreline to edge and parent material hardness limitations.
√  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
Bolt (Grade 5 min.) Ensure full thread engagement before applying load.
Hardened bushing with sufficient wall thickness to withstand applied compression load.
Test panel.
Head Dia. + 1.6mm
Applied Load from compression gauge.
Compression rig base.
Push-out testing of Self-Clinching Flush 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.
Testing Method
Material code
1
2
1
2
1
2
1
2
1
2
1
2
1
2
3
4
Max. recommended tightening torque for mating screw (Nm)
0.23
0.36
0.36
0.40
0.58
0.88
0.16
3.70
Thread code
M2.5
M3
ALTM3
M3.5
M4
M5
M2
M6
5
Test sheet material
Aluminium
Steel
Aluminium
Steel
Aluminium
Steel
Aluminium
Steel
Aluminium
Steel
Aluminium
Steel
Aluminium
Steel
Aluminium
Axial tensile strength (kN)
0.68
0.85
0.85
0.93
1.00
1.30
0.57
4.50
Steel
Installation force (kN)
9
14
9
14
11
16
11
16
12
18
13
19
9
14
16
21
Push-out (N)
880
950
880
950
1000
1200
1000
1200
1100
1400
1300
1500
880
950
2750
3700
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
Material & Finish
300 series Stainless Steel (A2) Suitable for installation in ductile material with a maximum recommended hardness of 70 HRB. 300 series stainless steel parts are not suitable for installation into stainless steel panels. Please give us a call if you want to discuss your specific application.
Part Number Examples
Part number is made up as follows: (Type)-(Thread code)-(Material code)-(Material/Finish code) For example: NF-M3-1-A2 (Flush Nut-M3-1.5mm min sheet thickness-stainless steel) NF-M4-2-A2 (Flush Nut-M4-2.4mm min sheet thickness-stainless steel)
RoHS REACH COMPLIANT
Info
Self-Clinching Flush 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 both sides 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.   Flush Nuts are available in various thread sizes, manufactured from 300 series stainless steel and are suitable for installation in ductile steel and aluminium panels with a recommended maximum hardness of 70 HRB.
Performance
Type NF
SELF-CLINCHING FLUSH NUTS
self-clinching flush nuts