High-precision countersink with unequal spacing and 3 drive flats 90° 20,5 mm

Article no.: 150393 20,5
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External ⌀ Dc (mm) Unit price incl. VAT
  • Countersink tip angle: 90
  • Tool material: HSS E
  • Spacing of the countersink cutting edges: unequal spacing
  • Number of cutting edges Z: 3
  • Standard: DIN 335 C

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Product details

Technical Data

External ⌀ 20.5 mm
Coating AlTiCN
Countersink tip angle 90 degrees
Tool material HSS E
Spacing of the countersink cutting edges unequal spacing
Number of cutting edges Z 3
Standard DIN 335 C
Shank Shank with h9 and three drive flats
Through-coolant no
smallest countersink ⌀ for holes from 3.5 mm
Overall length L 63 mm
Shank ⌀ Ds 10 mm
for countersunk screws DIN 7991 M10
Feed f in stainless steel < 900 N/mm2 0.14 mm/rev.
Shank tolerance h9
Colour ring blue
Pre-drill ⌀ 3.5 mm
Type of product Stepped drill and countersink

Identification numbers & Classifications

Article number 150393 20,5
EAN / GTIN 4062406277239
Manufacturer number 150393 20,5

Application Table

Alu plastics
N
53
Aluminium (short chipping)
N
40
Alu > 10% Si
N
35
Steel < 500 N/mm²
P
55
Steel < 750 N/mm²
P
30
Steel < 900 N/mm²
P
25
Steel < 1100 N/mm²
P
15
Steel < 1400 N/mm²
P
12
INOX < 900 N/mm²
M
18
INOX > 900 N/mm²
M
13
Ti > 850 N/mm²
S
13
GG(G)
K
30
CuZn
N
42
wet maximum
 
wet minimum
 
dry
 

Description

Version:

All countersinks have 3 cutting edges, radially relieved.
Flutes are ground from solid.
High-precision countersink, produced with tight manufacturing tolerances similar to DIN 335-C.
Special geometry with unequal spacing and matching cutting edge preparation.
Newly developed AlTiCN coating especially for stainless steels.
Three drive flats on the shank for use in a 3-jaw chuck.

Application:

High-precision countersinks for chatter-free production of precise, round 90° countersunk surfaces.

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Coating AlTiCN TiAlN uncoated TiAlN TiAlN
for countersunk screws DIN 7991 M10 M10 M10 M10 M10
Through-coolant no no no no no
Countersink tip angle 90 degrees 90 degrees 90 degrees 90 degrees 90 degrees
Shank Shank with h9 and three drive flats Shank with h9 and three drive flats Shank with h9 and three drive flats Three clamping flats to h9 Three clamping flats to h9
Shank tolerance h9 h9 h9 h9 h9
Type of product Stepped drill and countersink Stepped drill and countersink Stepped drill and countersink Stepped drill and countersink Stepped drill and countersink

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