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Np
Self Clinching Fasteners

Clinch Nuts

Flush Nuts

Blind Clinch Nuts

Mini Clinch Nuts

Nyloc Clinch Nuts

Locking Clinch Nuts

Floating Clinch Nuts

Flush Head Studs

Reduced Head Studs

Unthreaded Pins

Tapered Pins

High Strength Studs

Through Standoffs

Blind Standoffs

Snaptop Standoffs

Keyhole Standoffs

Panel Fasteners

Low Profile Panel Fasteners

Broaching Panel Fasteners

Plunger Assemblies

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NP - Self Clinching Fasteners - Flush Head Studs

Self Clinching Flush Head Studs provide a strong torque resistant captivated male thread in thin panels.

As the name suggests Flush Head Clinch Studs install fully flush on the back of the panel meaning that minimal surface finishing is required after installation. The special castellated Clinch feature provides excellent torque out and push out resistance. Available in Steel, 300 series Stainless Steel (for use in panels up to 70 HRB), 400 series stainless steel (for use in panels up to 92 HRB) and Aluminium in thread sizes M2 - M8. Like all self clinching fasteners they are installed using a parallel squeezing action so require access to both sides of the panel.

Thread
& Pitch

D
± 0.4

H
Max

Min Sheet
Thickness

Hole Size
in Panel
+ 0.08 - 0.0

Max Mating
Hole

Min C/L to
edge of panel

M2.5 x 0.45

4.1

1.95

1.0

2.5

3.1

5.4

M3 x 0.5

4.6

2.1

1.0

3.0

3.6

5.6

M3.5 x 0.6

5.3

2.25

1.0

3.5

4.1

6.4

M4 x 0.7

5.9

2.4

1.0

4.0

4.6

7.2

M5 x 0.8

6.5

2.7

1.0

5.0

5.6

7.2

M6 x 1.0

8.2

3.0

1.6

6.0

6.6

7.9

M8 x 1.25

9.6

3.7

2.4

8.0

8.6

9.6


Lengths

Thread Size

Length (L) ± 0.4

M2.5

6

8

10

12

15

-

-

-

-

-

-

-

-

M3

6

8

10

12

15

18

20

-

-

-

-

-

-

M3.5

6

8

10

12

15

18

20

22

-

-

-

-

-

M4

6

8

10

12

15

18

20

22

25

-

-

-

-

M5

-

8

10

12

15

18

20

22

25

28

-

-

-

M6

-

-

10

12

15

18

20

22

25

28

30

35

-

M8

-

-

10

12

15

18

20

22

25

28

30

35

38

This part is also available to special order with a 'Dog-Point' thread lead-in to aid nut alignment and assembly. Please contact our sales office for more information.

Materials

Finishes

Carbon Steel
300 Series Stainless Steel (A2)
400 Series Stainless Steel (400) - (Check for availability)
Aluminium (AL) (Special Order)

Bright Zinc / Trivalent Clear Passivate (ZI)
Other finishes available to order

The following installation panel material hardness
limitations apply when installing Self Clinching Studs.
Steel Clinch Studs: 80HRB Max
300 series Stainless Steel Clinch Studs: 70HRB Max
Aluminium Clinch Studs 50HRB Max
400 series Stainless Steel Clinch Studs: 92HRB Max
(A special anvil is recommended for a proper
installation, the maximum recommended panel thickness
is 2.4mm call our sales office for further information)

Part Number Examples

Type | Thread | Length | Finish
i.e. : NFH-M3-10-ZI
(Clinch Stud-M3x10mm-Steel-BZP)
i.e. : NFH-M4-20-A2
(Clinch Stud-M4x20mm-Stainless Steel)

Installation Guide for 300 Series

Thread Size

Panel Thickness

D
+ 0.08

C
+ 0.1

M2.5

1.50mm panel thicknesses & below

2.53

3.1

1.51mm panel thicknesses & over

Not Required

M3

1.5mm panel thicknesses & below

3.03

3.6

1.51mm panel thicknesses & over

Not Required

M3.5

1.50mm panel thicknesses & below

3.53

4.1

1.51mm panel thicknesses & over

Not Required

M4

1.50mm panel thicknesses & below

4.03

4.6

1.51mm panel thicknesses & over

Not Required

M5

1.50mm panel thicknesses & below

5.03

5.6

1.51mm panel thicknesses & over

Not Required

M6

2.40mm panel thicknesses & below

6.03

6.6

2.41mm panel thicknesses & over

Not Required

M8

2.41mm panel thicknesses & over

8.03

Not Required

First punch or drill the correct size hole. DO NOT deburr the hole prior to installation as this will remove material required during the clinching process. It is preferable to install the fastener from the side of the panel with the burring or blow through.

Place the fastener in the hole like in the diagram above making sure the part is seated squarely. Apply a parallel squeezing force until the head is embedded flush in the panel.

When installing Self Clinching fasteners, please pay attention to the minimum hole centerline to edge and parent material hardness limitations.

For special applications or if you are unsure of any aspect about the usage or installation of this fastener, give our sales office a call and we will do our best to offer you a solution or give advice on your application.

Installation Guide for 400 Series

Thread Size

A
± 0.025

B
± 0.05

C
± 0.05

D
± 0.08

R1 Max

R2 Max

M3

0.25

4.57

3.81

3.05

0.08

0.13

M4

0.25

5.82

4.95

4.04

0.08

0.13

M5

0.25

7.16

6.15

5.08

0.08

0.13

400 Series Stainless Steel Studs require a special anvil to achieve a proper installation. This utilises a staking ring to help displace the panel material into the annular groove of the stud. It is recommended that 400 series studs are not installed into panel thicknesses greater than 2.4mm as the effect of the special anvil is reduced.

The anvil should be manufactured from tooling steel and should be hardened to a minimum of 55 Rockwell C to provide a satisfactory anvil life. It is recommended that the A dimension be measured every 5000 installations to ensure the anvil remains within specification. A worn anvil will reduce installation effectiveness and could compromise performance of the part.

First punch or drill the correct size hole. DO NOT deburr the hole prior to installation as this will remove material required during the clinching process. It is preferable to install the fastener from the side of the panel with the burring or blow through.

Place the fastener in the hole like in the diagram above making sure the part is seated squarely.

Apply a parallel squeezing force until the head is embedded flush in the panel.

When installing Self Clinching fasteners, please pay attention to the minimum hole centerline to edge and parent material hardness limitations.

For special applications or if you are unsure of any aspect about the usage or installation of this fastener, give our sales office a call and we will do our best to offer you a solution or give advice on your application.

Performance Data

Thread
Size

Max Nut
Tightening
Torque (Nm)

Fastener
Type

Test Panel

Installation
(kN)

Pushout
(N)

Torque Out
(N)

Pull Thru
(N)

M2.5

0.42

NFH - ZI

1.5mm Aluminium

8.87

463

1.07

2612

NFH - A2

11.65

467

0.82

1830

NFH - ZI

1.5mm Steel

11.01

472

1.09

2792

NFH - A2

13.94

474

0.84

1815

M3

0.75

NFH - ZI

1.5mm Aluminium

12.79

598

1.74

3157

NFH - A2

12.82

604

1.38

2569

NFH - ZI

1.5mm Steel

14.68

817

1.73

3838

NFH - A2

14.71

822

1.35

2443

0.95

NFH - 400

1.5mm
Stainless Steel*

40.26

3319

1.87

3528

M3.5

1.20

NFH - ZI

1.5mm Aluminium

15.66

795

1.72

3792

NFH - A2

15.65

798

1.68

3440

NFH - ZI

1.5mm Steel

22.42

1342

2.87

3783

NFH - A2

22.44

1339

2.15

3439

M4

1.75

NFH - ZI

1.5mm Aluminium

19.89

974

2.89

4451

NFH - A2

22.40

975

2.87

4176

NFH - ZI

1.5mm Steel

28.51

1782

4.25

5661

NFH - A2

26.92

1780

2.98

4772

2.15

NFH - 400

1.5mm
Stainless Steel*

49.95

4387

6.75

8095

M5

3.75

NFH - ZI

1.5mm Aluminium

24.35

1082

3.63

5169

NFH - A2

24.39

1075

3.61

4763

NFH - ZI

1.5mm Steel

33.75

2043

6.62

6275

NFH - A2

33.49

2041

6.35

6013

4.35

NFH - 400

1.5mm
Stainless Steel*

53.42

4936

10.71

10017

M6

5.95

NFH - ZI

2.5mm Aluminium

29.89

1668

7.39

10197

NFH - A2

28.76

1663

7.32

9083

NFH - ZI

2.5mm Steel

44.60

2561

11.45

11384

NFH - A2

44.36

2558

10.09

10653

M8

14.50

NFH - ZI

2.5mm Aluminium

29.70

1918

11.38

10585

NFH - A2

29.75

1911

11.32

9534

NFH - ZI

2.5mm Steel

44.97

2897

19.82

15462

NFH - A2

49.75

2879

17.65

13621

*Maximum hardness 92 HRB.

The above data is based on average values obtained in a test environment. Variations in hole size, panel material and installation will effect performance. It is recommended that you carry out your own performance tests in the actual application. Contact our sales department who will be happy to supply samples free of charge.

Performance shown for 400 Series Stainless Steel Studs is typical when parts are installed using an anvil with a staking ring as specified

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