SUGGESTED TAPS (GUIDE TO KEY LETTERS)

A.  Spiral Point Tap             E.  Standard Plug Tap 
B.  Standard Bottoming Tap       F.  Standard Set
C.  Spiral Flute Tap             G.  Serial Set
		       
		       
	       Metres     Recommended    Lubricant
    Material   per Min  Through| Blind
			 Hole  | Hole
  
Aluminium      25 - 40   A,E     B,C,E    Sol. Oil
  (Si<10%)
Brass          25 - 30   B,E     B,E      Light Base Oil
Bronze         10 - 20   B,E     B,E      Light Base Oil
Copper         27 - 3    A       B,E      Light Base Oil
Plastic        18 - 21   E       B,E      Dry  

DIE CASTINGS
Aluminium       8 - 12   A,E     B,E,C    Sol. Oil
  (SI>10%)
Zinc           18 - 21   A,E     B,E,C    Sol. Oil
Fibre          26 - 29   E       B,E      Dry

IRON
Malleable       6 - 12   A,E     B,E,F,C  Sol. Oil
					  
STEEL
Cast            6 - 12   E,F     B,E,F,C  Sulph. Base Oil
Chrome          3 - 8    E,G     B,E,F,G  Sulph. Base Oil
			       
MILD STEELS
CARBON
Up to 0.4%     12 - 21   A,E,F   B,E,F,C  Sulph. Base Oil
0.4% to 0.7%    9 - 15   A,E,G   B,E,G    Sulph. Base Oil 
more than 0.7%  7 - 10   A,E,G   B,E,G    Sulph. Base Oil
					       

Stainless Steel 4 - 8    A,E,G   B,E,G    Sulph. Base Oil
		    
SUGGESTED TAPS (GUIDE TO KEY LETTERS)

A.  Spiral Point Tap            E.  Standard Plug Tap 
B.  Standard Bottoming Tap      F.  Standard Set
C.  Spiral Flute Tap            G.  Serial Set

The above suggestions must be considered as being 
of a general nature.  Various materials and conditions 
may require experiment.  We strongly recommend wherever 
possible the use of STANDARD TAPS.  They can be obtained 
from stock and are considerably less expensive 
than specials.