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Plain shank thread mill with countersinking step 2×D, TiAlN, UNC: 1/4-20

Article no.: 139725 1/4-20

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UNC Unit price incl. VAT
  • Thread type: UNC; UNC-LH
  • Flank angle: 60
  • Tool material: Solid carbide
  • Shank: DIN 6535 HA with h6
  • Through-coolant: yes

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Product details

Technical Data

Thread size 1/4-20 UNC
Coating TiAlN
Thread type UNC; UNC-LH
Flank angle 60 degrees
Tool material Solid carbide
Shank DIN 6535 HA with h6
Through-coolant yes
Thread pitch 1.27 mm
Threads per inch 20
Nominal ⌀ DC 4.7 mm
Shank length Ls 36 mm
Overall length L 62 mm
Shank ⌀ Ds 8 mm
Neck ⌀ D1 6.6 mm
No. of teeth Z 3
Feed fz in steel < 1100 N/mm2 0.018 mm
Application for type of drilling up to 2×D for blind holes; up to 2×D for through holes
Countersink angle 90 degrees
Shank tolerance h6
Number of clamping slots 3
Colour ring green
Internal/external application Internal
Hole ⌀ 4.7 mm
Thread depth 12.7 mm
Type of product thread milling cutter

Identification numbers & Classifications

Article number 139725 1/4-20
Manufacturer number 139725 1/4-20

Application Table

Alu plastics
N
220
Aluminium (short chipping)
N
220
Alu > 10% Si
N
170
Steel < 500 N/mm²
P
170
Steel < 750 N/mm²
P
150
Steel < 900 N/mm²
P
120
Steel < 1100 N/mm²
P
80
Steel < 1400 N/mm²
P
60
Steel < 55 HRC
H
35
INOX < 900 N/mm²
M
90
INOX > 900 N/mm²
M
70
Ti > 850 N/mm²
S
60
GG(G)
K
120
CuZn
N
180
Uni
 
wet maximum
 

Description

Version:

Corrected thread profile for milling exact internal threads (ensure stable clamping conditions).
Incorporating a countersink profile for a 90° countersink.

Advantage:

Countersinking and thread milling in one operation!

Application:

For UNC unified coarse threads ASME-B1.1.

Note:

NEW GENERATION AVAILABLE!
Recommended successor product is No. 139723.

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