Page 390 - Yamawa_European_Catalogue_YEU21

Forming Taps

SURZ
Intro

MP Multi Purpose Series
SP Thread Forming Taps for Stainless Steel, Coated

FEATURES
Multi purpose forming taps for blind and through hole
2P application.
SL HSS-P COATING
THCHT Special form on thread root to control the minor diameter
of internal threads.
Special lobe shape to reduce tapping torque.
Recommended Tapping Speeds Depending On Materials
PO
ISO Vc (m/min) ISO Vc (m/min)
P1 15÷30 H M1 10÷25 H
P2 15÷30 H M2 10÷25 H
ST P3 15÷25 H
P4 15÷25 H
P7 10÷25 H
H 1st choice I suitable
ROLL

JIS JIS-SURZ
Product Features
- Adopting the special form on thread root, SURZ controls the minor diameter geometry of internal threads.
CARBIDE
- Special lobe shape reduces the tapping torque.
- High effi ciency can be obtained in thread forming of stainless steel parts.
- The minor diameter geometry of internal threads can be adjusted modifying the bored hole size.

LONG
Process Data
M2×0.4
Work-material AISI 304 - 1.4301 M2x0.4 6H internal Recommended bored hole diameter before tapping
HAND Tapping length 5.2mm (Blind hole) thread minor diameter Unit : mm
and tolerance
TAPS
Tapping speed 5m/min Max. 1.679 Size Class Recommended
Bored hole ø1.85 - ø1.82 Min. 1.567 bored hole size
M1X0.25 G4 0.90
Machine Machining center (BT15) Tolerance 0.112
EG (STI) Feed Rigid M1.2X0.25 G4 1.10
M1.4X0.3 G4 1.28
Tapping direction Vertical
M1.6X0.2 G3 1.52
Lubricant Water soluble oil (×20)
SPECIAL M1.6X0.35 G4 1.46
THREADS, Bored hole size φ1.82 φ1.81 M1.7X0.35 G4 1.56
GAUGES
M2X0.4 G4 1.82
Cross section M2.3X0.4 G4 2.12
THREAD picture of internal M2.5X0.45 G4 2.30
threads
MILLS
M2.6X0.45 G5 2.40
M3X0.5 G5 2.77
Seam shape Small seams No seam
No.2-56UNC G4 1.98
Minor diameter φ1.59 φ1.58
DIES No.4-40UNC G5 2.55
Bored hole size φ1.84 φ1.83 No.6-32UNC G5 3.14

Based on our tapping test experiences the
CENTER Cross section recommended bored hole diameters shown in
DRILLS picture of internal above table have been calculated aiming at 90%
threads thread engagement and trying to avoid tap
breakage.

Technical Seam shape Regular seams Small seams Recommended bore hole diameter may change
because material deformation can slightly change
info Minor diameter φ1.62 φ1.60 depending on material, hardness, dimension of
workpiece and tapping condition.

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