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)
Installation (kN)
Torque-out (Nm)
Pushout (N)
Test sheet material
Pull-thru (N)
Standoff material
5.4M3
0.33
Aluminium
Steel
0.44
0.55
7.5
7.5
7.5
15.0
15.0
0.55
0.44
1350
1350
1350
1860
1860
2.85
2.85
2.85
3.95
3.95
825
1100
830
1700
1350
Aluminium
Steel
Stainless
Steel
Stainless
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.
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.    With the panel held level, apply a parallel squeezing force until the hexagon head 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.
5.50 +0.8
Length of standoff +6.35mm min.
√  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 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. 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)-(Length)-(Material/Finish code) For example: NSOG-5.4M3-8-A2 (Thru-threaded grounding standoff-M3 thread (larger body)-8mm long-stainless steel) NSOG-5.4M3-12-ZI (Thru-threaded grounding standoff-M3 thread (larger body)-12mm long-electro zinc plated steel) NSOG-5.4M3-6-AL (Thru-threaded grounding standoff-M3 thread (larger body)-6mm long-aluminium)
RoHS REACH COMPLIANT
Info
Self-Clinching Grounding Standoffs provide strong captivated reusable female threads in a spacer format in panels as thin as 1.0mm. Utilising a hexagon head and a special proven clinch feature, this fastener has excellent torque-out, pull-through and push-out characteristics whilst providing a flush finish on the underside of the panel, meaning that minimal surface finishing is required after installation. This thru-threaded standoff is ideal for use in applications with chassis-to-ground printed circuit boards, featuring projecting teeth that ensure strong electrical conductivity with the board’s circuitry, thereby eliminating the need for additional loose hardware such as serrated or star washers for example.   Self-Clinching Grounding Standoffs are available in a range of thread sizes and lengths. Manufactured from electro zinc plated carbon steel, 300 series stainless steel, aluminium and are suitable for installation in ductile panels with a recommended maximum hardness of 80 HRB for steel parts, 70 HRB for 300 series stainless steel parts and 50 HRB for aluminium parts.
Installation
Self Clinching Grounding Standoffs
Type NSOG
SELF-CLINCHING GROUNDING STANDOFFS
self-clinching grounding standoffs ANVIL ANVIL PUNCH ANVIL ANVIL PUNCH
Test panel held firmly in vice.
Applied torque from dial measuring torque wrench.
Flat washer 2 pitch min.
Bolt (Grade 5 min.) Ensure full thread engagement (min. 6 threads recommended).
Torque-out testing of Self-Clinching Standoffs 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 standoff turning in the panel or cam-out.
Pull-through test for Self-Clinching Standoffs should be performed by the gradual application of an axial load as shown. A hardened bushing with a through-hole 0.5mm greater than the diameter of the thread should be centred over the hexagon head and inserted into the test rig lower link. A hardened bushing should be inserted into the test rig upper link and a bolt screwed down into the standoff. 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-through values obtained during this test do not indicate the axial strength of the threads. Pull-through values pertain only to the amount of force required to pull the hexagon head through the panel or for head failure.
Tensile testing rig upper link
Tensile testing Rig lower link
Hardened bushing
Hardened bushing.
Applied Load.
Body dia. + 0.5mm
Bolt (Grade 5 min.) Ensure full thread engagement (min. 6 threads recommended).
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 Standoffs 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 standoff during testing. The bushing bore must be centred on the hexagon head of the standoff.