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Maryland Metrics Technical Data Chart
DIAMETERS AND PITCHES FOR SELF TAPPING SCREWS

SHEET METAL SCREWS SCREWS FOR PLASTICS
    FINE COARSE JIS(CLASS #) ORIGINAL DURO DELTA
ISO/USA ST/PT (AB) (A) JIS(1) JIS(2/4) JIS(3) EJOT (PT) DURO (PT) DELTA (PT)
DIAM. DIAM. PITCH mm PITCH mm PITCH mm PITCH mm PITCH mm DIAM. PITCH mm DIAM. PITCH mm DIAM. PITCH mm
- 1                   K10 0.44
- 1.2                   K12 0.51
- 1.4                   K14 0.573
  1.5           K15 0.67        
- 1.6                   K16 0.641
- 1.8           K18 0.8     K18 0.709
- 2       0.63 0.4         K20 0.78
#2 2.2 1.26         K22 0.98 K22 0.71 K22 0.85
- 2.5       0.91 0.45 K25 1.12 K25 0.77 K25 0.95
#4 2.9 1.06                    
- 3     1.06 1.06 0.5 K30 1.34 K30 0.86 K30 1.12
#6 3.5 1.27 1.41 1.41 1.27 0.6 K35 1.57 K35 0.95 K35 1.29
#7 3.9   1.59                  
- 4     1.59 1.41 0.7 K40 1.79 K40 1.04 K40 1.46
#8 4.2 1.41 1.69                  
- 4.5     1.81 1.59 0.75           1.63
#10 4.8 1.59 2.12                  
- 5     2.12 1.59 0.8 K50 2.24 K50 1.23 K50 1.8
#12 5.5 1.81 2.31                  
- 6     2.54 1.81 1 K60 2.69 K60 1.42 K60 2.14
#14 6.3 1.81 2.54                  
1/4"   1.81                    
- 7           K70 3.14 K70 1.6 K70 2.48
5/16"   2.12                    
- 8     2.82 2.12 1.25 K80 3.59 K80 1.79 K80 2.82
3/8"   2.12                    
- 10           K100 4.49     K100 3.5
#20     2.82                  
#24     2.82                  


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