User Guide for PEM models including: F4 Self Clinching Flush Nuts, F4, Self Clinching Flush Nuts, Clinching Flush Nuts, Flush Nuts, Nuts

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FTM
PEMSERT® SELF-CLINCHING FASTENERS

H

A

C

PEM® self-clinching flush nuts are flush with both sides of the sheet.

Pemsert® Self-Clinching Flush Fasteners PEMSERT® self-clinching flush nuts are designed to be installed into sheets as thin as .060"/1.5 mm. FTM and F4TM fasteners are ideal for applications where a thin sheet requires threads stronger than a tapped hole but still must remain flat, with no protrusions on either surface, enhancing the functional and cosmetic qualities of the entire assembly. PEMSERT® flush nuts are installed easily by squeezing them into a round hole in metal sheets. They can be installed before bending and forming to provide threads in places which would be inaccessible for installation after chassis are formed. The hexagonal head along with the proven PEM® self-clinching design ensures high axial and torsional strength. F4TM flush nuts are specifically designed to be installed into stainless steel sheets. PEMSERT® FTM fasteners can be ordered to conform to US NASM45938/4 specifications.* Fastener drawings and models are available at www.pemnet.com. Custom sizes are available on special order. Contact us for more information.
*To meet national aerospace standards and to obtain testing documentation, product must be ordered to NASM45938/4 specifications. Consult our Marketing department for a complete Military Specification and National Aerospace Standards Reference Guide (Bulletin NASM) or check our web site.
Fastener drawings and models are available at www.pemnet.com
Custom sizes are available on special order. Contact us for more information.
F-2 PennEngineering · www.pemnet.com

Pemsert® Self-Clinching Flush Fasteners

Profile for Profile for -2, -3, -4, -1 shank code. & -5 shank codes.

H

A

A

Part Number Designation

F

­ 632 ­ 1

F 4 ­ 632 ­ 1

C

C

All dimensions are in inches.

Unified

Thread Size
.086-56 (#2-56) .112-40 (#4-40) .138-32 (#6-32) .164-32 (#8-32) .190-32 (#10-32)

Type

Fastener Material

Stainless

Hardened

Steel

Stainless Steel

F

F4

F

F4

F

F4

F

F4

F

F4

.250-20

(1/4-20)

F

F4

Thread Code
256 440 632 832 032
0420

Clinching profile may vary.

Type Material Code

Thread Code

Shank Code

Shank Code
1 2 1 2 1 2 1 2 1 2 3 4 5

A (Shank)
Max.

Sheet Thickness

Hole Size In Sheet +.003 -.000

C Max.

.060

.060 - .091

.172

.171

.090

.091 Min.

.060

.060 - .091

.172

.171

.090

.091 Min.

.060

.060 - .091

.213

.212

.090

.091 Min.

.060

.060 - .091

.290

.289

.090

.091 Min.

.060

.060 - .091

.312

.311

.090

.091 Min.

.120

.125 - .156

.151

.156 - .187

.344

.343

.182

.187 Min.

Min. Dist.

H

Hole C/L

Nom.

to Edge

(1)

.188

.23

.188

.23

.250

.27

.312

.28

.343

.31

.375

.34

All dimensions are in millimeters.

Thread Size

Type

Fastener Material

300 Series

Hardened

Stainless Steel Stainless Steel

M2 x 0.4

F

F4

M2.5 x 0.45

F

F4

Metric

M3 x 0.5

F

F4

M4 x 0.7

F

F4

M5 x 0.8

F

F4

Thread Code
M2 M2.5 M3 M4 M5

M6 x 1

F

F4

M6

Shank Code
1 2 1 2 1 2 1 2 1 2 3 4 5

A (Shank)
Max.

Sheet Thickness

Hole Size In Sheet +0.08

C Max.

1.53

1.53 - 2.32

4.37

4.35

2.3

2.32 Min.

1.53

1.53 - 2.32

4.37

4.35

2.3

2.32 Min.

1.53

1.53 - 2.32

4.37

4.35

2.3

2.32 Min.

1.53

1.53 - 2.32

7.37

7.35

2.3

2.32 Min.

1.53

1.53 - 2.32

7.92

7.9

2.3

2.32 Min.

3.05

3.18 - 3.96

3.84

3.96 - 4.75

8.74

8.72

4.63

4.75 Min.

(1) For more information on proximity to bends and distance to other clinch hardware, see PEM® Tech Sheet C/L To Edge.

Min. Dist.

H

Hole C/L

Nom.

to Edge

(1)

4.8

6

4.8

6

4.8

6

7.9

7.2

8.7

8

9.5

8.8

F-3 PennEngineering · www.pemnet.com

Pemsert® Self-Clinching Flush Fasteners

Material And Finish Specifications

Threads

Internal,

ASME B1.1, 2B /

Type

ASME B1.13M, 6H

F

·

F4

·

Part Number Code For Finishes

Fastener Materials

300 Series Stainless Steel

Hardened 400 Series Stainless Steel

·

·

(1) HRB - Hardness Rockwell "B" Scale. HB - Hardness Brinell.

Standard Finish
Passivated and/or Tested Per ASTM A380
·
·
None

For Use in Sheet Hardness: (1)

HRB 88 / HB 183 or less

HRB 70 / HB 125 or less

·

·

A Note About Hardened 400 Series Stainless Steel
In order for self-clinching fasteners to work properly, the fastener must be harder than the sheet into which it is being installed. In the case of stainless steel panels, fasteners made from 300 Series Stainless Steel do not meet this hardness criteria. It is for this reason that 400 series F4TM fasteners are offered. However, while these 400 Series fasteners install and perform well in 300 Series stainless sheets they should not be used if the end product:
· Will be exposed to any appreciable corrosive environment. · Requires non-magnetic fasteners. · Will be exposed to any temperatures above 300° F (149° C)
If any of the these are issues, please contact techsupport@pemnet.com for other options.

F-4 PennEngineering · www.pemnet.com

Pemsert® Self-Clinching Flush Fasteners

Installation
1. Prepare properly sized round mounting hole in sheet. Do not perform any secondary operations such as deburring. 2. Place fastener onto the anvil and place the mounting hole (preferably the punch side) over the shank of the fastener. 3. With installation punch and anvil surfaces parallel, apply sufficient squeezing force only to embed hexagonal head flush in sheet.
The metal displaced by the head flows evenly and smoothly around the back-tapered shank of the fastener, securely locking it into place with high pullout resistance while at the same time, the embedded hexagonal head provides high torque resistance.

Installation Tooling - F and F4 Nuts

Thread Code

HAEGER® Part Number

Anvil

Punch

PEMSERTER® Part Number

Anvil

Punch

256/M2/M2.5 440/M3 632 832/M4 032/M5 0420/M6

H-120-256/M2/M2.5-L H-108-0018L

H-120-440/M3-L H-108-0018L

H-120-632-L

H-108-0018L

H-120-832/M4-L H-108-0018L

H-120-032/M5-L H-108-0018L

H-120-0420/M6-L H-108-0018L

8006193 975200040 975200041 975200042 975200043 975200044

975200048 975200048 975200048 975200048 975200048 975200048

Anvil Dimensions A +.002" -.000" + 0.05mm ±.005"

.060"

1.52mm

.050"

.077"

1.96mm

.050"

.092"

2.34mm

.050"

.124"

3.15mm

.050"

.139"

3.53mm

.050"

.186"

4.72mm

.100"

P ±0.13mm 1.27mm 1.27mm 1.27mm 1.27mm 1.27mm 2.54mm

PUNCH

ANVIL

P

A

Installation Notes · For best results we recommend using a HAEGER® or PEMSERTER® machine for installation of PEM® self-clinching fasteners. See our
website for more information. · Visit the Animation Library on our website to view the installation process.

For Additional HAEGER® and PEMSERTER® Tooling Information / Part Numbers

}

Go to haeger.com to access the Auto and Manual Tooling Wizards

HAEGER® MANUAL TOOLING CATALOG HAEGER® AUTO TOOLING CATALOG

Or download the HAEGER WIZZARD Phone App

PEMSERTER® MANUAL TOOLING CATALOG PEMSERTER® AUTO TOOLING CATALOG

}

F-5 PennEngineering · www.pemnet.com

Pemsert® Self-Clinching Flush Fasteners

Performance Data(1)

FTM Nuts

Unified

Axial Thread Shank Tensile Code Code Strength
(lbs.) (2)

256

1 2

130

440

1 2

165

632

1 2

190

832

1 2

230

032

1 2

280

3

0420 4 1035

5

Rec. Tightening Torque (3) (in. lbs.)
1.50
2.50
3.50
5.25
7.50
36

Test Sheet Material

5052-H34 Aluminum Cold-rolled Steel

Installation Pushout Installation Pushout

(lbs.)

(lbs.)

(lbs.)

(lbs.)

2000

150

3000

200

2000

150

3000

200

2000

200

3600

200

2000

240

4000

240

2500

240

5000

240

3500

640

6000

840

Unified

F4TM Nuts
Thread Code
256 440 632 832 032
0420

Shank Code
1 2 1 2 1 2 1 2 1 2 3 4 5

Axial Tensile Strength (lbs.) (2)
130 165 190 230 280
1035

Rec. Tightening Torque (3) (in. lbs.)
1.50
2.50
3.50
5.25
7.50
36

Test Sheet Material

300 Series Stainless Steel

Installation (lbs.)

Pushout (lbs.)

7200

270

7200

270

7200

290

9000

450

9000

450

14000

1000

Metric

Metric

Thread Code
M2 M2.5 M3 M4 M5
M6

Shank Code
1 2 1 2 1 2 1 2 1 2 3 4 5

Axial Tensile Strength (kN) (2)
0.57
0.68
0.85
1
1.3
4.5

Rec. Tightening Torque (3)
(N·m)
0.16
0.23
0.36
0.58
0.88
3.7

Test Sheet Material

5052-H34 Aluminum Cold-rolled Steel

Installation Pushout Installation Pushout

(kN)

(N)

(kN)

(N)

8.9

665

13.3

890

8.9

665

13.3

890

8.9

665

13.3

890

8.9

1068

17.8

1068

11.1

1068

22.2

1068

15.6

2847

26.7

3736

Thread Code
M2 M2.5 M3 M4 M5
M6

Shank Code
1 2 1 2 1 2 1 2 1 2 3 4 5

Axial Tensile Strength (kN) (2)
0.57
0.68
0.85
1
1.3
4.5

Rec. Tightening Torque (3)
(N·m)
0.16
0.23
0.36
0.58
0.88
3.7

Test Sheet Material

300 Series Stainless Steel

Installation (kN)

Pushout (N)

32

1200

32

1200

32

1200

40

2000

40

2000

65

4500

(1) Published installation forces are for general reference. Actual set-up and confirmation of complete installation should be made by observing proper seating of fastener as described in the installation steps. Other performance values reported are averages when all proper installation parameters and procedures are followed. Variations in mounting hole size, sheet material, and installation procedure may affect performance. Performance testing this product in your application is recommended. We will be happy to provide technical assistance and/or samples for this purpose.
(2) Failure occurs in screw stripping using a 60 ksi screw and the shortest shank length fastener. (3) Torque values shown will produce a preload of 70% of axial tensile strength with nut factor "k" equal to .2. Threads may strip or head of the F nut may bend and/or fail if
screw is over-torqued beyond these values or if actual k value is less than .2.

All PEM® products meet our stringent quality standards. If you require additional industry or other specific quality certifications, special procedures and/or part numbers are required. Please contact your local sales office or representative for further information.
Regulatory compliance information is available in Technical Support section of our website. Specifications subject to change without notice. See our website for the most current version of this bulletin.

North America: Danboro, Pennsylvania USA | E-mail: info@pemnet.com | Tel: +1-215-766-8853 | 800-237-4736 (USA) Europe: Galway, Ireland | E-mail: europe@pemnet.com | Tel: +353-91-751714 Asia/Pacific: Singapore | E-mail: singapore@pemnet.com | Tel: +65-6-745-0660 Shanghai, China: E-mail: china@pemnet.com | Tel: +86-21-5868-3688 Visit our PEMNETTM Resource Center at www.pemnet.com · Technical support e-mail: techsupport@pemnet.com
F-6 PennEngineering · www.pemnet.com

6/14/24



References

• Fastener Insertion Machines | Haeger Machines | Haeger USA
• PEM - PennEngineering | Homepage
• All Categories On PennEngineering
• PEM - PennEngineering | Homepage
• Animation Library - PEM® Fastening Products
• Regulatory - PEM® Fastening Products
• REACH/RoHS Compliance Lookup | PEM
• Installation Equipment - PEM® Fastening Products