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Cutting Tools
Overview – Machine thread drills
Material group
Thread type
G
G
UNC
UNC
UNC
UNC
UNF
UNF
Colour ring
yellow
blue
yellow
yellow
green
green
yellow
yellow
Order No.
1745
1766
1768
1770
1746
1747
1772
1774
Threaded section
G 1/8"– G 1"
G 1/8"–G 1"
Nr. 2–56"–
1–8"
Nr. 4–40"–
1–8"
Nr. 4–40"–
3/4–10"
Nr. 4–40"–
7/8–9"
Nr. 10–32"–
1–12"
Nr. 10–32"–
1–12"
For through threads
≤ 3 x D
≤ 3 x D
≤ 3 x D
For blind holes
≤ 3 x D
≤ 3 x D
≤ 3 x D
≤ 3 x D
≤ 3 x D
Type/form
NR 40/C
INOX R 40/C
N/B
NR 40/C
N/B
N/C
N/B
NR 40/C
Material
HSS-E
HSS-E
HSS-E
HSS-E
HSS-E
HSS-E
HSS-E
HSS-E
Tolerance zone
ISO 228
ISO 228
2 B
2 B
2 B
2 B
2 B
2 B
Surface
steam
TiCN
bright
bright
steam
steam
bright
bright
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Steels
up to
850
N/mm
2
C
C
C
C
C
C
C
Steels
up to
850
N/mm
2
C
C
Steels
up to
850
N/mm
2
Steels
up to
42 HRC
Steels
up to
52 HRC
Steels
up to
56 HRC
Steels
up to
60 HRC
Hard
machining
over
60 HRC
Stainless
and acid-
resistant
steels (INOX)
C
Ti steels,
Ti alloys,
special
steels
Cast iron
materials
Al,
AI and
Mg alloys
C
C
C
C
C
C
C
Copper,
brass,
bronze
C
recommended
U
suitable
V
limited suitability
Thread Cutting Tools
170