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The Tap & Die Co
445 West Green Road
London N15 3PL - UK
Tel:+44 (0)20 88881865
Fax:+44 (0)20 88884613
Email:
sales@tapdie.com

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Drills Guide

Drills Guide for Drill Selection and Use (Drill Recommendation):
The table below should be only taken as a general guide

MATERIAL
TO BE CUT

DRILL
TYPE

DRILL
HELIX

CUTTING SPEED RANGE

POINT ANGLE
(Degrees)

LUBRICANT
 

FEED
RATE

meter/min

feet/min

STEELS,
mild free cutting

Standard
 

Standard
 

30 - 60
 

100 - 200
 

118
 

Soluble
oil

Heavy
 

STEELS,   low alloy
carbon/tool steels

Standard
 

Standard
 

15 - 40
 

50 - 130
 

118
 

Soluble
oil

Medium
 

STEELS,   Cr / Mo alloy,
annealed HSS, ferritic stainless

Standard /
Heavy Duty Co

Standard
 

5 - 16
 

15 - 50
 

118
 

Soluble
oil

Medium
 

STEELS, Cr / Ni alloy
Austenitic stainless (1)

Standard /
Heavy duty Co

Standard
 

4 - 12
 

12 - 40
 

135
Split / Notched

Mineral
oil

Light
 

STEELS,   Mn alloy Rail,
Armour, some spring steels

Co, very
heavy duty

Slow
 

3 - 5
 

10 - 12
 

135
Split / Notched

Dry (2)
 

Light
 

NIMONIC
alloys

Standard,
Cobalt

Fairly
quick

3 - 8
 

10 - 26
 

135
Split

Mineral
oil

Light
 

IRON,
soft grey malleable

Standard
 

Standard
 

20 - 80
 

60 - 100
 

118
 

Dry (2)
 

Heavy
 

IRON,
hard cast (1)

Standard /
Cobalt

Standard
 

10 - 20
 

30 - 65
 

90 or 118
 

Dry (2)
 

Medium
 

COPPER,  pure electrolytic,
ductile alloys

Standard
 

Quick
 

30 - 60
 

100 - 200
 

118 or 135
 

Mineral
oil

Heavy
 

COPPER,  hard alloys
including Cu / Be

Standard
 

Standard
 

20 - 30
 

60 - 100
 

118 or 135
 

Mineral
oil

Medium
 

NICKEL-SILVER
 

Standard
 

Quick
 

30 - 40
 

100 - 130
 

118
 

Soluble
oil

Medium
 

BRASS
 

Standard
 

Slow
 

40 - 80
 

130 - 260
 

118
 

Dry (2)
soluble

Heavy
 

PHOSPHOR-BRONZE (1),
GUN METAL

Standard
 

Slow
 

30 - 70
 

100 - 220
 

118
 

Dry (2)
soluble

Medium
 

ZINC,
Zn Alloy, Mazak

Standard
 

Standard
 

30 - 40
 

100 - 140
 

118
 

Soluble
oil

Heavy
 

ALLUMINIUM,  pure
Al / Si  AI / Mn  AI / Cr Alloy

Standard
 

Quick
 

50 - 100
 

160 - 330
 

118 or 135
 

Soluble
oil

Very
Heavy

ALUMINIUM-MAGNESIUM
alloy

Standard
 

Quick
 

50 - 80
 

160 - 260
 

118 or 135
 

Dry (2)
soluble

Very
Heavy

MAGNESIUM
alloy

Standard
 

Quick
 

80 - 100
 

250 - 330
 

135
 

Dry (2)
 

Very
Heavy

TITANIUM
 

Very Heavy
Duty

Standard
 

5 - 12
 

16 - 40
 

118 - 135
 

Soluble
oil

Light
 

PLASTICS Thermo ductile, PVC
polyethylene, polypropylene

Standard
 

Quick
 

50 - 100
 

160 - 330
 

118 - 135
 

Water
or Dry (2)

Medium
 

PLASTIC Thermo setting,
ebonite, bakelite, phenolite

Standard
 

Quick
 

20 - 60
 

60 - 200
 

60 or 90
 

Dry (2)
 

Medium
 

GLASSFIBRE RE-INFORCED
PLASTIC

Standard
wide flute

Slow
 

50 - 100
 

160 - 330
 

80 - 90
 

Dry (2)
 

Medium
 

PERSPEX
 

Standard
wide flute

Slow
 

20 - 40
 

80 - 130
 

135
 

Water
 

Medium
 

  (1) Tungsten Carbide Drills may be considered for these materials
  (2) Compressed air may be used


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