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Article code:
EAN / GTIN:
Manufacturer number:
Cat. No.:
Stub stepped drill HSS 90°, vaporised, for threads: M3
Article no.: 238441
Catalog no.: 117020
Article code:
Product details
Technical Data
| Through-coolant | no | |
| Entry of cooling lubricant | without cooling lubricant entry | |
| Escape of cooling lubricant | without cooling lubricant exit | |
| Feed f | 0.03 mm/rev. | |
| Wet maximum | suitable | |
| Interface position | on the machine | |
| Holder type, joint 1 | plain shank | |
| Interface coding | ZYL00340105 | |
| Holder shape | plain shank | |
| Holder version | metric | |
| Holder size, metric | 3,4 mm | |
| Type of mounting | spigot | |
| Holder tolerance class | h8 | |
| Diameter of shaft DS | 3.4 mm | |
| Length of shank LS | 32 mm | |
| Oil | suitable | |
| Cooling lubricant | yes | |
| Manufacturer’s designation | Kernloch-Kurzstufenbohrer HSS | |
| Cutter diameter, min. Dc min. | 2.5 mm | |
| Cutter diameter, max. Dc max. | 3.4 mm | |
| Configurable | no | |
| Tolerance of cutter diameter | tolerance class ISO | |
| Tolerance class ISO | h8 | |
| Number of steps | 2 | |
| Index of step | 1; 2 | |
| Step angle | 90 degrees | |
| Flute length Lc | 20 mm | |
| Distance from cutter corner to cutter tip | 0.75 mm | |
| Number of teeth Z | 2 | |
| Twist direction | right-hand | |
| Angle, 1st step | 118 degrees | |
| Step angle | 90 degrees | |
| Tool material | HSS | |
| Machining group | K (cast iron); N (non-ferrous metals); P (steel) | |
| Cutting media, manufacturer’s designation | HSS | |
| Coating | vaporised | |
| Interface | joint 1 | |
| Tolerance class | h8 | |
| Usable length L1 | 14 mm | |
| Overall length L | 52 mm | |
| Functional length | 51.25 mm | |
| Weight | 2 g | |
| Cutting direction | right-hand cutting | |
| Tool version | solid steel | |
| Standard | DIN 1897 | |
| Machining method | drilling into solid material (BVB); profile drilling (BPB) | |
| Colour ring | without | |
| Type of product | stepped drill | |
| Feed in | steel < 750 N/mm2 | |
| Content | single part |
Packaging units
| 1 Carton | 10 pieces |
Identification & Classification
| Article number | 238441 | |
| Catalog number | 117020 | |
| EAN / GTIN | 4045197035639 | |
| Manufacturer number | 117020 M3 | |
| Article class | 11C | |
| Manufacturer/responsible person | Hoffmann Supply Chain GmbH & Co. KG, Poststraße 15, 90471 Nürnberg, Germany, www.hoffmann-group.com |
Application Table
N
45
P
40
P
30
P
25
K
25
N
80
Description
Version:
Very sturdy. Tight concentricity tolerances between drill ⌀ and counterbore ⌀ guarantee exact alignment.
Special surface treatment, resulting in reduced tendency to edge build-up and improved chip evacuation.
Special surface treatment, resulting in reduced tendency to edge build-up and improved chip evacuation.
Advantage:
Hole and countersink are produced in one operation and precisely aligned.
Application:
Particularly suitable for NC machines due to high positional accuracy, excellent centring properties and great sturdiness. The preceding centring operation can thus often be omitted. For thread tapping drill holes to DIN 336 sheet 1 with 90° countersink. In the following operation, the tap therefore does not have to cut into the sharp edge of the hole.