Self Clinching Blind Nuts Installation and Performance

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NORTHERN PRECISION LTD

Specialist Fasteners for Sheet Metal

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+44 (0) 1302 831555

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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

Performance

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)-(Material code)-(Material/Finish code) For example: NB-M3-1-A2 (Blind Nut-M3-1.0mm min sheet thickness-stainless steel) NB-M6-2-ZI (Blind Nut-M6-2.3mm min sheet thickness-electro zinc plated carbon steel)

Info

Self-Clinching Blind Nuts provide strong reusable female threads in panels that are too thin to be conventionally tapped. Utilising a special proven clinch feature, this fastener has excellent torque-out and push-out characteristics whilst providing a flush finish on the underside of the panel. The closed end (blind) feature of this fastener has the added benefit of sealing the component and threads against foreign matter and eliminates the risk of a potentially damaging incursion of extra long screws - especially useful in electronic components with a risk of shorting. Like all self clinching fasteners they are installed using a parallel squeezing action, so require access to both sides of the panel. Blind Nuts are available in various thread sizes, manufactured from electro zinc plated steel and 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 stainless steel parts.

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

Installation

Thread code

Material code

Sheet thickness

1.0

1.4

1.0

1.4

1.0

1.4

1.0

1.4

Installation (kN)

Torque-out (Nm)

Pushout (N)

Aluminium

Steel

Aluminium

Steel

Test sheet material

1.1

1.5

1.8

2.0

2.5

4.0

5.0

400

750

560

1020

480

950

640

1200

1.0

1.4

1.0

1.4

Aluminium

Steel

3.6

5.8

4.8

6.9

500

980

810

1280

1.4

2.3

1.4

2.3

Aluminium

Steel

10.1

14.0

16.0

16.2

1350

1450

1750

1790

Testing Method

L Min.

11.3

10.0

14.2

11.3

A +0.07

5.28

3.92

7.88

6.10

Thread codes

Anvil Dimensions

Bolt (Grade 5 min.) Ensure full thread engagement before applying load.

Hardened bushing with sufficient wall thickness to withstand applied compression load.

Body Dia. + 1.6mm

Test panel.

Compression rig base.

Bolt (Grade 5 min.) Ensure bolt is of sufficient length to bottom out with sufficient head-space remaining above panel. Test panel held firmly in vice. Applied torque from dial measuring torque wrench.

Push-out testing of Self-Clinching Blind 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.

Torque-out testing of Self-Clinching Blind 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. Bottom out the bolt and gradually apply torque until failure is observed and a maximum applied torque reading is recorded. Failure mode is the nut turning in the panel or cam-out.

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. Apply a parallel squeezing force until the head is seated against the panel with no serrations visible. 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.

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.

Type NB

SELF-CLINCHING BLIND NUTS