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
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Performance & Testing Method
Thread size
Max. nut tightening Torque (Nm)
M3
M4
M5
Pull-out (N)
1050
1100
n/a
n/a
1200
2000
n/a
n/a
1300
3100
n/a
n/a
Installation (kN)
6.2
6.5
6.0
6.3
12.5
13.5
12.0
13.0
15.0
18.0
15.0
17.0
Pull-out (N)
580
900
555
850
800
1350
650
1100
920
1600
750
1350
Fastener Type
NCH (A2)
NCFH (A2)
NCH (AL)
NCFH (AL)
NCH (A2)
NCFH (A2)
NCH (AL)
NCFH (AL)
NCH (A2)
NCFH (A2)
NCH (AL)
NCFH (AL)
Installation (kN)
0.50
0.50
0.30
0.30
2.00
2.00
1.20
1.20
3.60
3.60
2.16
2.16
8.0
8.9
n/a
n/a
15.0
16.0
n/a
n/a
19.0
21.0
n/a
n/a
Steel test panel
Aluminium test panel
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.
Pull-out test for Self-Clinching Concealed Head Studs should be performed by the gradual application of an axial load as shown. A hardened bushing should be centred over the stud collar and inserted into the test rig lower link. A hardened threaded bushing should be inserted into the test rig upper link and screwed down onto the stud. An axial load is then gradually applied on a tensile testing machine to separate the links until a failure point is reached. Please note that the pull-out values obtained during this test do not indicate the axial strength of the  threads. Pull-out values pertain only to the amount of force required to pull the stud out of the panel.
Tensile testing rig upper link
Tensile testing rig lower link
Hardened bushing
Hardened threaded bushing. A minimum of 6 fully engaged threads is recommended.
Applied Load.
Max Head Dia. +1.0mm to +1.5mm
ANVIL PUNCH
A
Length of stud +6.35mm min.
ANVIL PUNCH
Anvil Dimensions
A +0.08
4.40
3.40
5.40
Thread size
M4
M3
M5
First mill a blind hole in the panel to the correct diameter and depth.   Place the fastener in to the anvil, then locate the hole over the shank of the fastener.   With the panel held level, apply a parallel squeezing force until the knurled collar is installed flush to the panel surface. 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.
√  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
300 Series Stainless Steel (A2) parts are suitable for installation in ductile panels with a maximum recommended hardness of 70 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)-(Length)-(Material/Finish code) For example: NCH-M3-10-A2 (Concealed Head Stud-1.6mm minimum panel-M3 thread-10mm long- stainless steel) NCH-M4-16-AL (Concealed Head Stud-1.6mm minimum panel-M4 thread-16mm long- aluminium) NCFH-M4-20-A2 (Concealed Head Stud-2.4mm minimum panel-M4 thread-20mm long- stainless steel)
RoHS REACH COMPLIANT
Info
Self-Clinching Concealed Head Studs provide strong captivated male threads in panels as thin as 1.60mm. Utilising a special proven clinch feature, this fastener has excellent pull-out and torque-out characteristics. Installed into a pre-prepared milled blind hole, it leaves the underside of the panel intact. Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides of the panel.   Concealed Head Studs  are available in a range of thread sizes and lengths, manufactured from 300 series stainless steel, aluminium and are suitable for installation in ductile panels with a recommended maximum hardness of 70 HRB for stainless steel parts and 50 HRB for aluminium parts.
Installation
Self Clinching Concealed Head Studs
Type NCH & NCFH
SELF-CLINCHING CONCEALED HEAD STUDS
self-clinching concealed head studs