NP
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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
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Reliability
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Push-out testing of Self-Clinching Miniature 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.
Bolt (Grade 5 min.) Ensure full thread engagement before applying load.
Hardened bushing with sufficient wall thickness to withstand applied compression load.
Collar Dia. (A) + 1.6mm
Test panel.
Applied Load from compression gauge.
Compression rig base.
Bolt (Grade 5 min.) A minimum of 2 threads should extend past the end of the fastener.
Test panel held firmly in vice.
Flat washer 2 pitch min.
Applied torque from dial measuring torque wrench.
Torque-out testing of Self-Clinching Miniature Nuts 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 nut turning in the panel or fracture of the knurled collar.
Performance
Thread code
M3
M4
M5
M6
M2
Material code
1
2
1
2
1
2
1
1
Installation force (kN)
4.0
6.7
6.7
9.4
4.0
1.35
5.42
5.42
12.43
0.45
Torque-out (Nm)
391
600
689
1134
689
1134
1423
89
Push-out (N)
Installation force (kN)
6.7
11.1
11.1
15.6
5.8
1.35
5.42
5.42
12.43
0.45
Torque-out (Nm)
622
934
1156
1601
1156
1601
1868
133
Push-out (N)
Steel test panel
Aluminium test panel
Max. rec. tightening torque for mating screw (Nm)
0.76
1.8
2.2
4.8
0.3
1.13
2.8
3.5
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
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 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.   With punch and anvil surfaces parallel, apply a squeezing force until the knurled collar is flush with the top of the panel or the shank is flush with the bottom of the panel for thinner panels. Do not over squeeze the fastener into the panel as this will result in panel deformation. It is important that a pocketed anvil is used so that force is applied to the knurled collar rather than the head of the fastener.   When installing Self-Clinching fasteners, please pay attention to the minimum hole centreline to edge and parent material hardness limitations.
L Min.
2.55
2.30
3.70
3.20
A +0.12
4.09
2.63
6.61
5.36
Thread codes
M3
M2
M5
M4
Anvil Dimensions
3.95
7.85
M6
A L ANVIL PUNCH ANVIL PUNCH √  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
Installation
Material & Finish
Type NMC (Non-Locking) - 300 Series Stainless Steel (A2) Type NMLC (Locking)- 300 Series Stainless Steel (A2) + Molybdenum Disulphide Dry Film Lubricant 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)-(Material code)-(Material/Finish code) For example: NMC-M3-1-A2 (Non-Locking Miniature Nut-M3-0.99-1.14 sheet thickness-stainless steel) NMLC M4-2-A2 (Locking Miniature Nut-M4-1.50-1.78 sheet thickness-stainless steel)
RoHS REACH COMPLIANT
Info
Self-Clinching Miniature Nuts provide strong reusable female threads in panels that are too thin to be conventionally tapped where space is at a premium or installation very close to the edge is required.   Utilising a special proven clinch feature in combination with a radially knurled collar, this fastener has excellent torque-out and push-out characteristics whilst providing a flush finish on the underside of the panel. Available in non-locking and locking versions, the locking version features an elliptically deformed body plus a dry film lubricant to provide prevailing torque locking capability to limit loosening under vibration.   Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides of the panel.   Miniature Clinch Nuts are available in various thread sizes, are 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.
Self Clinching Miniature Locking and Non-Locking Clinch Nuts
Type NMC|NMLC
SELF-CLINCHING MINIATURE NUTS
self-clinching miniature nuts