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The preferred metric screw thread is the Coarse Thread Pitch. If this is not suitable due to wall thickness and space considerations, the Fine Thread Pitch is available. 
 
Size (mm) Pitch (mm) Tap Drill (mm) Clearance Drill (mm)
 1.6  0.35  1.25  1.8
 2  0.4  1.60  2.4
 2.5  0.45  2.00  2.90
 3  0.5  2.50  3.40
 3.5  0.6  2.90  3.90
 4  0.7  3.30  4.50
 5  0.8  4.20  5.50
 6  1  5.00  6.60
 8  1.25  6.80  9.00
 10  1.5  8.50  12.00
 12  1.75  10.20  14.00
 14  2  12.00  16.00
 16  2  14.00  18.00
 20  2.5  17.50  22.00
 22  2.5  19.50  25.00
 24  3  21.00  27.00
 27  3  24.00  30.00
 30  3.5  26.50  33.00
 36  4  32.00  40.00
 42  4.5  37.50  46.00
 48  5  43.00  53.00
 56  5.5  50.50  62.00
 64  6  58.00  70.00
 72  6    
 80  6    
 90  6    
 100  6    
Glossary