Self Clinching Thin Panel Non Flush Studs Installation and Performance

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NORTHERN PRECISION LTD

Specialist Fasteners for Sheet Metal

+44 (0) 1302 836010

+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

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.

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)

0.74

1.7

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

320

240

530

270

680

Torque-out (Nm)

0.6

1.1

0.65

2.8

2.6

1.3

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

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.

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 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).

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

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