Material

 T →

#22

.03”

#20

.036

#18

.048

#16

.06

#14

.075

#13

.09

Extrusion

 B Ø cut Thread

Recommended

↓ Pre-Pierce

↓screw

↓ Female Bore Dimension ↓

#4-40

.127

.136

 

 

 

 

.090

.045

#5-40

.139

.148

.165

.180

 

 

.102

.051

#6-32

.144

.153

.171

.185

 

 

.107

.053

#8-32

 

.182

.199

.214

.233

 

.136

.064

#10-24

 

 

.213

.228

.247

.267

.150

.069

#10-32

 

 

.222

.237

.256

.276

.159

.074

1/4-20

 

 

.268

.283

.302

.322

.205

.100

1/4-28

 

 

 

 

 

 

 

 

RETURN TO FORMS DIRECTORY

NEXT PAGE

ELECTRICAL KNOCK OUT TOOLS

             

CE TOOLING  Extrusions

Form-Index

Extrusions our commonly used to accept sheet metal screws or permit tapping into a deeper distance than just the material thickness.  A pre-punched hole is required as a one hit pierce and extrude gives poor hole quality, and has limited adjustment on the machine.  The diameter of the pre-punched hole ultimately determines the height of the extrusion.  The limitation to the height is simply the metal’s limit of being drawn (stretched).    

 

 

 

 

 

Below is formula for determining pre-pierce “X” hole size

Reference Info:    X=Pierce Ø    B=Max. ExtrusionØ        C= B + 2(T1)      D= C + .010”    T=Mat’l Thickness 

H-Nominal Extrusion Hgt.   T1=Min. Mat’l Thk –.002”

Nominal H is 2 to 2½ of T

Formula for determining X if specific H is required  

X=D- 3.14(.005+.25T)-2(H-.005)

Material:

 T →

#22

.03”

#20

.036

#18

.048

#16

.06

#14

.075

#13

.09

Extrusion

 B Ø Cut Thread

Recommended

↓ Pre-Pierce

↓screw

↓ Female Bore Dimension ↓

M2,X,4

2,74

3,0

3,26

3,78

 

 

1,7

0,8

2,5x4,5

3,14

3,4

3,66

4,18

 

 

2,1

1,0

M3,X,5

3,64

3,9

4,16

4,68

 

 

2,6

1,3

M4,X,7

 

4,7

4,96

5,48

6,0

6,39

3,4

1,6

M5,X,8

 

 

5,86

6,38

6,9

7,29

4,3

2,0

M6,X1,

 

 

6,66

7,18

7,7

8,09

5,1

2,5