Self Clinching Nuts 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

Type NS

Steel and 300 Stainless Steel Clinch Nuts Performance

Thread code

M2|M2.5|M3

Material code

Test sheet material

Installation force (kN)

Aluminium

6 - 9

Steel

11 - 16

Push-out (N)

Torque-out (Nm)

285

410

770

485

570

1035

0.9

1.2

1.5

1.8

2.0

ALTM3|M3.5

Aluminium

11 - 14

Steel

13 - 27

290

415

850

490

580

1230

1.8

2.0

2.5

1.8

2.3

Aluminium

11 - 14

Steel

17 - 28

310

490

980

495

655

1250

2.4

2.6

4.0

3.0

4.1

5.0

Aluminium

11 - 16

Steel

18 - 40

320

510

990

535

815

1285

3.0

3.6

5.8

3.6

4.5

6.8

Aluminium

17 - 32

Steel

26 - 38

990

1590

1600

1395

1760

1775

7.9

10.1

14.3

13.0

17.1

Aluminium

18 - 33

1580

1600

1875

1890

13.5

18.2

18.9

20.1

Steel

26 - 38

M10

Aluminium

21 - 37

1690

1780

1965

2050

31.5

33.0

35.9

36.5

Steel

32 - 50

ALTM10

Aluminium

20 - 35

1910

30.0

32.5

33.0

Steel

29 - 45

1620

1695

2020

28.5

M12

Aluminium

30 - 42

2125

4700

39.0

84.0

Steel

44 - 70

400 Stainless Steel Clinch Nuts Performance

Thread code

Material code

Test sheet material

Installation force (kN)

304 Stainless Steel

Push-out (N)

Torque-out (Nm)

720

1300

820

1630

1300

1780

1.9

2.1

4.2

5.1

7.0

304 Stainless Steel

2050

2610

17.2

19.5

304 Stainless Steel

2250

4620

19.8

23.5

M10

304 Stainless Steel

2500

38.7

Aluminium Clinch Nuts Performance

Thread code

Material code

Test sheet material

Installation force (kN)

Aluminium

3.5 - 6.5

Push-out (N)

Torque-out (Nm)

440

540

530

760

0.7

1.0

3.1

3.2

4.0 - 6.8

Aluminium

4.4 - 6.9

5.7 - 8.0

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. 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 and possibly thread deformation. When installing Self-Clinching fasteners, please pay attention to the minimum hole centreline to edge and parent material hardness limitations.

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.) A minimum of 2 threads should extend past the end of the fastener.

Test panel held firmly in vice.

Applied torque from dial measuring torque wrench.

Flat washer 2 pitch min.

Push-out testing of Self-Clinching 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 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 cam-out.

√

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) part are suitable for installation in ductile panels with a maximum recommended hardness of 70 HRB. 400 Series Stainless Steel (400) parts are suitable for installation in ductile panels with a maximum recommended hardness of 90 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)-(Material code)-(Material/Finish code) For example: NS-M3-0-ZI (Clinch Nut-M3-0.8mm min. sheet thickness-electro zinc plated carbon steel) NS-M4-2-A2 (Clinch Nut-M4-1.4mm min. sheet thickness-stainless steel) NS-M5-1-AL (Clinch Nut-M5-1.0mm min. sheet thickness-aluminium)

Dimensional Data Installing 400 series parts into hard stainless steel panels Self-Clinching fastener Do’s & Don’ts Self-Clinching fastener problem solving guides Downloadable Data Sheet Back

Installation

Info

Self-Clinching 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. Like all self clinching fasteners they are installed using a parallel squeezing force so require access to both sides of the panel. Clinch Nuts are available in various thread sizes, manufactured from electro zinc plated steel, 300 and 400 series stainless steel, and aluminium and are suitable for installation in ductile steel and aluminium panels with a recommended maximum hardness of 80 HRB for steel parts, 70 HRB for 300 series stainless steel parts, 90 HRB for 400 series stainless steel parts and 50 HRB for aluminium parts.