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
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Hardened bush. A minimum of 6 fully engaged threads is recommended on both sides.
Test panel held firmly in vice.
Applied torque from dial measuring torque wrench.
Minimum grade 5 bolt (grade 8 for NHTS & NHFE fasteners).
Hardened bushing with sufficient wall thickness to withstand applied compression load.
Head Dia. + 1.6mm
Test panel.
Applied Load from compression gauge.
Compression rig base.
Push-out testing of Self-Clinching Thin Panel Non-Flush Head Studs 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 stud during testing. The bushing bore must be centred on the head of the stud.
Torque-out testing of Self-Clinching Thin Panel Non-Flush Head Studs 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 stud turning in the panel, cam-out, or dependent on stud type/size, thread failure.
Performance
Thread size
Max. nut tightening Torque (Nm)
M3
0.74
M4
1.7
M5
3.5
Installation (kN)
5.5
5.6
11.4
12.3
12.0
12.2
15.9
16.7
15.4
14.5
24.8
25.2
Pushout (N)
200
200
320
320
240
240
530
530
270
270
680
680
Torque-out (Nm)
0.6
0.6
1.1
1.1
0.65
0.65
2.8
2.6
1.3
1.3
3.1
3.1
Fastener Type
NTFH (ZI)
NTFH (A2)
NTFH (ZI)
NTFH (A2)
NTFH (ZI)
NTFH (A2)
NTFH (ZI)
NTFH (A2)
NTFH (ZI)
NTFH (A2)
NTFH (ZI)
NTFH (A2)
Aluminium
Test sheet material
Steel
Aluminium
Steel
Aluminium
Steel
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
Anvil Dimensions
C +0.2
6.25
4.95
6.85
A +0.08
4.03
3.03
5.03
Thread size
M4
M3
M5
B +0.1
4.6
3.6
5.6
Countersunk hole style anvil for  0.75mm or less panel thickness.
Straight thru hole style anvil for  0.76mm minimum panel thickness.
Pocket punch detail. Pocket provides clearance for head protrusion, minimising risk of over installation.
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 prepared hole in the panel and then locate the fastener in the anvil, ensuring that you are using the appropriate anvil type for the panel thickness like in the diagram above.   With the panel held level, apply a parallel squeezing force until the face of the punch meets the panel surface. This fastener is not designed to install flush, correct installation should leave the head protruding by a maximum of 0.64mm. 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
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) parts are suitable for installation in ductile panels with a maximum recommended hardness of 70 HRB.
Part Number Examples
Part number is made up as follows: (Type)-(Thread)-(Length)-(Material/Finish code) For example: NTFH-M3-10-ZI (Thin Panel Stud-M3-10mm long-electro zinc plated carbon steel) NTFH-M4-12-A2 (Thin Panel Stud-M4-12mm long-stainless steel) Use part designation NTFHD to specify a dog-point thread lead-in (special order).
RoHS REACH COMPLIANT
Info
Self-Clinching Thin Panel Studs provide strong captivated male threads in panels as thin as 0.51mm. This fastener does not install fully flush on the underside of the panel. Utilising a special proven castellated clinch feature, this fastener has good torque-out, pull-through and push-out characteristics whilst providing minimal protrusion on the underside of the panel (refer to S dimension). Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides of the panel.   Reduced Head Studs are available in a range of thread sizes and lengths, manufactured from electro zinc plated steel, 300 series stainless steel and are suitable for installation in ductile steel and aluminium panels with a recommended maximum hardness of 80 HRB for steel parts and 70 HRB for 300 series stainless steel parts. Reduced Head Studs can also be supplied with a dog-point thread lead-in to aid component assembly.
Dimensional
Self Clinching Thin Panel Non Flush Studs
Type NTFH
SELF-CLINCHING THIN PANEL NON-FLUSH  STUDS
self-clinching thin panel studs
A
Length of stud +3.2mm min.
A
Length of stud +3.2mm min.
90°
B
ANVIL ANVIL ANVIL ANVIL PUNCH PUNCH PUNCH PUNCH
C
0.51mm 0.53mm