TopThread ™
Threading Selection Guide
Step 1 • Select Threading Method and Hand of Tooling
Required Information:
L
• External/internal operation.
R
L
R
L
R
• Spindle rotation/hand of thread.
• Feed direction.
hand of thread
hand of toolholder
hand of insert
Feed direction toward the chuck • RECOMMENDED
L
L
L
R
R
L
R
L
R
R
external left-hand thread
L
external right-hand thread
R
internal left-hand thread
internal right-hand thread
Feed direction away from the chuck
L
L
R
L
L
L
R
R
R
R
external right-hand thread
external left-hand thread
L
internal right-hand thread
R
internal left-hand thread
Step 2 • Select Holder from Catalogue Page
The insert size must match the gage insert size of your toolholder selection:
Select the appropriate holder for the insert size and hand:
Required Information:
• External/internal operation.
• Minimum bore diameter (for internal operations).
• Hand of tool.
catalogue
number gage
insert
NSR-163D N.3R
NSR-164D N.4R
NOTE: TopThread toolholders and boring bars are listed with a gage insert to
indicate the size and hand required. They are compatible with
both grooving and threading inserts of the same size.
F6
NOTE: Optimise your threading operation by using the proper infeed method
and the recommended infeed values.
See the Technical section on pages F79–F101 of this catalogue.
For internal threading, minimum bore varies depending on thread type.
See page F92 for details.
widia.com
• Insert size (gage insert).