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SURZ

SU Thread Forming Taps

Specification

Coating 1.5D

Recommended Tapping Speeds depending on Materials

ow carbon steelsMedium carbon steelsHigh carbon steelsAlloy steelsStainless steels
15〜30 15〜3015〜2515〜2510〜25

For icon explanation, refer to P.50 Product features ●Adopting the special form on tap's root, SURZ controls the minor diameter geometry of internal threads. ●Special lobe shape realizes low tapping torque.

●High efficiency can be obtained in thread forming of stainless steel parts. ●By adjusting bored hole size, you can adjust the minor diameter geometry of internal threads.

Tapping data

Tapping condition [ M2×0.4 ]

Work materialSUS304
Tappinglength5.2mm（Blind hole）
Bored hole sizeφ1.85～φ1.82
Tappingspeed5m/min
FeedRigid
Tapping directionVertical
Machine lMachining center （BT15）
TappingfluidWater soluble oil(×20)
  • Recommended bored hole diameter

Bored hole size 1.84 1.83

before tapping Cross

Unit : mm
SizeClassRecommended bored hole size
M1X0.25G40.90
M1.2X0.25G41.10
M1.4X0.3G41.28
M1.6X0.2G31.52
M1.6X0.35G41.46
M1.7X0.35G41.56
M2X0.4G41.82
M2.3X0.4G42.12
M2.5X0.45G42.30
M2.6X0.45G52.40
M3X0.5G52.77
No.2-56UNCG41.98
No.4-40UNCG52.55
No.6-32UNCG53.14

section

Bored hole size 1.82 1.81

section picture of

Seam shape Seams remain a little.

Minor diameter 1.59

M2x0.4 6H internal thread minor diameter and tolerance

Max.1.679
Min.1.567
Tolerance0.112

No seam remains.

  • 1.58
  • Recommended bored hole diameters shown in above table have been calculated by aiming at the thread engagement of 90% and by considering avoidance of tap breakage, based on our past tapping test experiences.
  • Recommended bore hole diameter may change because material deformation can slightly change depending on material, hardness, dimension of workpiece and tapping condition.