Page 406 - Yamawa_European_Catalogue_YEU21

Carbide Taps

EH-CT
Intro

MS Material Specifi c Series
SP Carbide Taps for Hard Materials (<55HRC), Coated

FEATURES
Carbide taps for high hardness steel (45 ÷ 55HRC).
SL HF COATING 5P Specifi c design, ultra fi ne micrograin, suitable coating for
CARBIDE SYNCHRO THCHT long and stable tool life.

Recommended Tapping Speeds Depending On Materials
PO
ISO Vc (m/min) This item will be gradually replaced by:
H1 ≤5 H
. UH-CT page 400
H 1st choice I suitable
ST

ROLL

DIN-EH-CT
Process Data
CARBIDE Work-material X40CrMoV5 1 - 1.2344
Still running
EH-CT Still running
DIN Hardness 50HRC
Size M8x1.25
Competitor Breakage
Tapping speed 6 m/min
LONG
Feed system Full rigid
Lubricant non-soluble oil
HAND Work-material X20Cr13 - 1.4021
TAPS Hardness 52HRC EH-CT Still running
Still running
Size M8x1.25
Tapping speed 6 m/min Competitor Breakage
EG (STI) Feed system Full rigid
Lubricant non-soluble oil

SPECIAL Torque line in diff erent bored hole sizes
THREADS, Bored hole size 6.8mm (Actual 6.79mm) 6.9mm (Actual 6.89mm) EH-CT
GAUGES Size: M8 x 1.25
Thread engagement ratio
Material: X40CrMoV5 1 - 1.2344
50 HRC
torque (N·cm)
cutting speed: 6m/min
THREAD thrust (N) feed: rigid
MILLS Lubricant: non-soluble oil
Beginning
Enlarging bored hole size by
0.1mm can reduce the tapping
torque by 10%. When tapping
DIES materials of high hardness,
Torque torque (average) 770N·cm torque (average) 680N·cm it is recommendable to drill
and
thrust lines the bored hole size as large as
possible.
CENTER
DRILLS After
50
holes
tapping
Technical
info torque (average) 890N·cm torque (average) 780N·cm

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