Self Clinching Flush Head Pilot Pins Installation and Performance

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NORTHERN PRECISION LTD

Specialist Fasteners for Sheet Metal

+44 (0) 1302 836010

+44 (0) 1302 831555

Tel:

Fax:

sales@npfasteners.com

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SELF-CLINCHING

Clinch Nuts Flush Nuts Blind Nuts Miniature Nuts Nyloc Nuts Locking Nuts Floating Nuts Flush Head Studs Flush Head Studs for Stainless Steel Reduced Flush Head Studs Thin Panel Non-Flush Studs High Strength Studs Thin Panel High Strength Studs Flush Head Pins Flush Head Tapered Pins Concealed Head Studs Through & Blind Standoffs Grounding Standoffs Thin Panel Standoffs Quick Release Standoffs Keylock Standoffs Concealed Head Standoffs Flush Panel Screw Assembly Panel Fasteners Phillips Head Panel Fasteners Low-Profile Panel Fasteners Plunger Assembly Self-Clinching fastener Do’s and Don’ts Self-Clinching fastener problem solving guides Self-Clinch in harder panels

Testing Method

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 Flush Head Pins 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.

Performance

Body dia.

3mm

4mm

5mm

Fastener Type

NFH (ZI)

NFH (A2)

NFH (AL)

NFH (ZI)

NFH (A2)

NFH (ZI)

NFH (A2)

NFH (AL)

NFH (ZI)

NFH (A2)

NFH (ZI)

NFH (A2)

NFH (AL)

NFH (ZI)

NFH (A2)

Test sheet material

Aluminium

Steel

Aluminium

Steel

Aluminium

Steel

Installation (kN)

12.5

10.5

14.5

19.9

22.4

14.5

28.5

26.9

24.3

24.4

15.0

33.8

33.5

Pushout (N)

610

600

580

820

810

970

780

1780

1750

1080

1075

890

2050

2040

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.

Anvil Dimensions

C +0.10

5.44

4.90

6.93

A +0.05

4.10

3.10

5.10

Pin dia.

4mm

3mm

5mm

B +0.05

4.19

3.61

5.61

Countersunk hole style anvil for 1.52mm or less.

Hole style anvil for 1.53mm and over panel thickness.

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. With the panel held level, apply a parallel squeezing force until the 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.

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.

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)-(Diameter)-(Length)-(Material/Finish code) For example: NFH-3MM-10-ZI (Flush Head Pin-3.0mm diameter-10mm long-electro zinc plated steel) NFH-4MM-15-A2 (Flush Head Pin-4.0mm diameter-15mm long-stainless steel) NFH-5MM-20-AL (Flush Head Pin-5.0mm diameter-20mm long-aluminium)

Info

Self-Clinching Flush Head Pins provide a strong captivated pilot pin or pivot point in thin panels. Utilising a special proven castellated clinch feature, this fastener has excellent push-out characteristics as well as good resistance to side loadings, whilst providing a flush finish on the underside of the panel, meaning that minimal surface finishing is required after installation. Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides of the panel. Flush Head Pins are available in a range of diameters and lengths, manufactured from electro zinc plated through- hardened 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.

Dimensional Data Self-Clinching fastener Do’s & Don’ts Self-Clinching fastener problem solving guides Downloadable Data Sheet Back

Installation