Page 218 - Threading_Handbook

Tool Material
THREAD MILLING Selecting a grade is strongly connected with the cutting geometry of a tool and other
• Which cutting tool grade is most suitable
Grade
for threading?

factors. The following table can assist in making the right choice: they visualize a grade
position in the field of application in accordance with standard ISO 513 and characterize the
grade properties compared with other grades.

The tables provide a summary of data about grade application in coordinates of
classification numbers from standard ISO 513 and availability of each grade per
thread family.
There are main and complementary grades. The main grades are more popular in machining
a considered class of engineering materials but in specific cases the complementary grades
can be effective as well. In a situation where a product produced from a main grade is not
available, a complementary grade provides an acceptable alternative.

The figures prioritize the main grades by numbers in brackets below the designation of a
grade. Prioritizing has general character and is intended for help in selecting the grade when
the information about application is not enough. A basic principle for selecting a grade
is that if abrasive wear is dominant, a hard grade should be used, while a tough grade is
needed for substantial mechanical loading during cutting.

Material
Stainless High Temp. Hardened
Steel Cast Iron Non ferrous
Steel Allows Steel
Material Field
Tough IC528 P25 - P45 (2) M30 - M40 (2) (1) (1) S15 - S30 (1) (2)

(1)
(1)
Grade IC908 P15 - P30 M20 - M30 K20 - K30 N10 - N25 S10 - S25 H20 - H30 (1)
IC903
H01-H10
S10-S20
P05-P15
M10-M20
Hard IC902 P05-P15 M10-M15 K05-K15 S05-S10 (2) H05-H15
(1) Recommended; Suitable
(2)
Economical Consideration

• Which tool should be used; indexable
Economical Efficiency insert, indexable head or solid cutter?
• What are the number of cutting edges?
The parameter for a number of cutting edges is an economic consideration.
The more cutting edges on an insert, the lower the cost per insert cutting edge.

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