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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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Tap: Tapping Speed, Feeds Lubricants

    Tap: Tapping Speeds, Feeds & Lubricants:

FEED, SPEEDS & LUBRICANTS (guidelines/recommendations shown below):

Speeds for machine tapping using HSS taps

MATERIAL

FEED SPEED (SFM)

LUBRICANT

Aluminium

70-90

Soluble oil

Aluminium alloy

50-70

Soluble, light base  or lard oil

Brass

60-100

Light base oil

Bronze

30-40

Light base oil

Copper

60-80

Light base oil

Gun metal

50-60

Soluble, light base  or lard oil

Grey cast iron

30-60

Dry or soluble oil

Alloy cast iron

15-30

Sulphur based oil

Malleable iron

20-40

Soluble or sulphur based oil

Magnesium alloy

50-70

Soluble oil or parafin with lard oil

Nimonic alloy

10-12

Very high pressure cutting oil

Plastics

50-70

Dry, freeze spray, liquid soap

Mild steel

30-50

Sulphur based oil

Carbon steel to 4%

20-40

Sulphur based oil

Carbon steel to 7%

20-30

Sulphur based oil

Carbon steel to 7%+

15-25

Sulphur based oil

Steel alloys to 60T

15-25

Sulphur based oil

Steel alloys to 60T+

10-15

Sulphur based oil

Stainless steels

10-20

Sulphur based oil

Tool steels

15-25

Sulphur based oil



There are many variables that can affect tapping speeds - experiment to find the ideal.
A good rule is to start at a slow speed and work up to a faster speed
Tapping speeds (RPM=Revs per minute) can be calculated:-
RPM  =  Feed speed (SFM)  divide by  0.26  x  tap OD(outside dia)

  Tapping speeds are determined by many factors, main ones being:
 a) thread pitch
 b) material being tapped
 c) depth of thread
 d) hole depth
 e) hole type: ‘through’ or ‘blind’
 f) lubricant quality and flow rate

 
Tapping speeds should be decreased if:-
 
a) ‘bottom’ lead is used or ‘spiral-flute’ taps are used
 b) lubricant is poor, or flow is restricted
 c) thread depth percent increases
 d) thread pitch is coarse
 e) if cutting ‘taper-threads’ (50 percent normal speed)
 f) if cutting ‘Acme’ or ‘Trapezoidal’ threads (40 percent normal speed)

 
Tapping speeds can be increased if:-
 
a) thread depth decreases
 b) thread pitch is fine
 c) coolant flow and quality is good
 d) spiral-point taps are used
 - On our website there is a lot of other very useful ‘Technical’ Data & Information for you to view

PRINT any Technical Data page you are viewing - [To help you do this, go to: File menu (click on it), click on Page Setup (in dropdown menu) - set Margins at 6mm for Left, Top, Right, Bottom - click OK. -Go back to: File menu (click on it)- click on Print - type Number of Copies required - click on Print. It will now print the information

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be reproduced or published in any article or website, without the written permission of:
 The Tap & Die Co, London