CLASS 4 TAPPING THREAD FOR USE IN METAL OR PLASTIC

Technical Data

Screw diameter Threads per inch Point angle Thread angle Minor Diameter Min Minor Diameter Max Major Diameter Min Major Diameter Max
M2 40 45 degree 60 degree 1.4 1.5 1.9 2
M2.5 28 45 degree 60 degree 1.8 1.9 2.4 2.5
M3 24 45 degree 60 degree 2.2 2.3 2.9 3
( M3.5 ) 20 45 degree 60 degree 2.6 2.7 3.4 3.5
M4 18 45 degree 60 degree 2.9 3 3.85 4
M5 16 45 degree 60 degree 3.6 3.8 4.85 5
M6 14 45 degree 60 degree 4.4 4.6 5.85 6
M8 12 45 degree 60 degree 5.9 6.1 7.8 8

 

S Type Hole Size                
Trilobular In metal sheet                
                   
In mm 0.6 sheet 0.8 sheet 1.0 sheet 1.2 sheet 1.6 sheet 2.0 sheet 2.6 sheet 3.2 sheet 4.0 Sheet
                   
2   1.76 1.78 1.8 1.83 1.85      
2.3   2.05 2.07 2.08 2.1 2.13      
2.5   2.23 2.24 2.26 2.28 2.31 2.33    
2.6   2.33 2.34 2.36 2.38 2.41 2.43 2.46  
3   2.7 2.72 2.74 2.76 2.78 2.81 2.86 2.86
3.5   3.15 3.17 3.2 3.23 3.27 3.29 3.32 3.34
4   3.61 3.64 3.67 3.71 3.75 3.78 3.81 3.83
5   4.57 4.62 4.64 4.66 4.71 4.77 4.8 4.81
6     5.53 5.56 5.59 5.63 5.7 5.74 5.79
8         7.52 7.56 7.61 7.67 7.73

 

P Type Hole Size  
Trilobular in plastic boss  
  ABS / Polyprop  
     
 in mm UP TO 2 D OF THREAD ENGAGEMENT ABOVE 2 D OF THREAD ENGAGEMENT
     
2 1.7 1.75
2.3 2 2.05
2.5 2.1 2.15
2.6 2.2 2.25
3 2.5 2.6
3.5 3.02 3.1
4 3.44 3.55
5 4.37 4.45
6 5.26 5.35
8 7.16 7.25

 

B TYPE Hole Size              
Trilobular In metal sheet              
                 
 in mm 0.6 sheet 0.8 sheet 1.0 sheet 1.2 sheet 1.6 sheet 2.0 sheet 2.6 sheet 3.2 sheet
                 
2 1.55 1.6 1.6 1.6 1.65 1.65 1.7  
2.3 1.9 1.9 1.9 1.95 1.95 1.95 2  
2.6 2.15 2.15 2.2 2.2 2.2 2.25 2.25 2.3
3 2.65 2.65 2.65 2.7 2.7 2.7 2.7 2.75
3.5 3.05 3.05 3.05 3.1 3.1 3.1 3.15 3.15
4 3.6 3.6 3.6 3.6 3.65 3.65 3.65 3.65
5   4.5 4.5 4.5 4.55 4.55 4.6 4.6
6     5.3 5.3 5.4 5.4 5.5 5.5
8     7.3 7.3 7.3 7.3 7.4 7.4
                 
B TYPE Hole Size              
Trilobular in plastic boss              
  ABS / Polyprop figures shown are diameter of Thread engagement used  
                 
 in mm 1 D 1.5 D 2 D 2.5 D 3 D 3.5 D 4 D  
                 
2 1.62 1.65 1.68 1.71 1.73 1.75 1.77  
2.3 1.85 1.91 1.95 1.97 1.99 2.03 2.06  
2.6 2.1 2.15 2.19 2.21 2.24 2.26 2.29  
3 2.44 2.49 2.51 2.54 2.59 2.65 2.68  
3.5 2.91 2.94 2.97 3.03 3.1 3.14 3.17  
4 3.33 3.39 3.43 3.47 3.54 3.58 3.62  
5 4.21 4.33 4.38 4.43 4.53 4.58 4.63  
6 5.12 5.27 5.33 5.44 5.51 5.57 5.57  
8 6.88 6.99 7.13 7.28 7.36 7.43 7.44  

4 and under

SCREW LENGTH JIS Machine screws & S-Type

Diameter length tolerance M2.6 and below Over M2.6 to M4.5 Over 4.5
4 and under 0-0.3 - -
Over 4 to 10 0-0.4 0-0.6 0-0.8
Over 10 to 20 0-0.6 0-0.6 0-1
Over 20 to 40 0-0.8 0-0.8 0-1
Over 40 - 0 0

SCREW LENGTH JIS Tapping screws & B-Type & P-Type

Diameter length tolerance Tapping Pointed Tapping blunt B Type and P Type
4 and under +/- 0.8 0-0.8 0-0.8
Over 4 to 16 +/- 0.8 0-0.8 0-0.8
Over 16 to 25 +/- 0.8 0-1.2 0-1.2
Over 25 to 36 +/- 1.2 0-1.2 0-1.2
Over 36 +/- 1.2 0-1.6 0-1.6

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