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
Performance & Testing Method
Steel test panel
Aluminium test panel
Push-out (N)
500
1350
575
1350
725
1900
2000
Installation (kN)
10
10
12
12
16
16
19
Push-out (N)
475
825
500
900
675
1150
1425
Thread size
M3
M4
M5
M6
Material code
1
2
1
2
1
2
1
Installation (kN)
22
22
27
27
36
36
54
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.
Hardened bushing with sufficient wall thickness to withstand applied compression load.
Body Dia. + 1.6mm
Test panel.
Applied Load from compression gauge.
Load should be applied to the shank of the fastener only.
Compression rig base.
Push-out testing of Self-Clinching Panel Fasteners 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 fastener during testing. The bushing bore must be centred on the body of the fastener.
Installation
B A
ANVIL
Thread Major Dia. +2.0mm
PUNCH
Max. screw extension
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 recessed 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 body shoulder is seated against the panel with no serrations visible. Do not over squeeze 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.
Anvil Dimensions
B ±0.5
7.87
7.49
7.87
A ±0.05
12.29
10.69
13.87
Thread size
M4
M3
M5
9.27
16.26
M6
√  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 Nickel plated Carbon Steel (CN) parts are suitable for installation in ductile panels with a maximum recommended hardness of 60 HRB.
Part Number Examples
Part number is made up as follows: (Type)-(Thread)-(Material code)-(Material/Finish Code) For example: NPFL2-M4-1-CN (Low-Profile Panel Fastener-M4 thread-1.0mm minimum sheet thickness-electro nickel plated steel)
RoHS REACH COMPLIANT
Info
Self-Clinching Low-Profile Panel Fasteners provide a captivated spring loaded screw for use in thin sheet metal where panel to panel attachment is needed and subsequent access is required. They reduce loose components and so reduce the risk of loose hardware being lost or falling out and damaging internal components. Featuring a  recessed head which sits over the body when in use, giving a lower profile. Actuation can be by tool or hand. Utilising a special proven clinch feature, this fastener has excellent pull-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 action, so require access to both sides of the panel.   Self-Clinching Low-Profile Panel Panel Fasteners are available in a range of thread sizes, manufactured from electro nickel plated carbon steel and are suitable for installation in ductile panels with a recommended maximum hardness of 60 HRB.
Self Clinching Low-Profile Panel Fasteners
Type NPFL2
SELF-CLINCHING LOW-PROFILE PANEL FASTENERS
self-clinching low profile panel fasteners ANVIL PUNCH ANVIL PUNCH