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 material SUS304

Tapping length 5.2mm(Blind hole)

Bored hole size φ1.85~φ1.82 POINT

Tapping speed 5m/min

Feed Rigid In use, please select proper bored hole diameter.

Tapping

Vertical

direction

Machining center

Machine

(BT15)

Tapping fluid Water soluble oil (×20)

  • Recommended bored hole diameter

Bored hole size 1.84 1.83

before tapping

Cross Unit : mm section picture of Recommended Size Class internal bored hole size

threadsM1X0.25G40.90
M1.2X0.25G41.10
Seam shapeNormal seams remain.Seams remain a little.M1.4X0.3G41.28
Minor diameter 1.62 1.60M1.6X0.2G31.52
M1.6X0.35G41.46
  • M1.7X0.35 G4 1.56

Bored hole size 1.82 1.81

M2X0.4G41.82
M2.3X0.4G42.12
CrossM2.5X0.45G42.30

section

M2.6X0.45 G5 2.40

picture of

internalM3X0.5G52.77
threadsNo.2-56UNCG41.98
No.4-40UNCG52.55
No.6-32UNCG53.14

Seam shape Seams remain a little. No seam remains.

  • Recommended bored hole diameters shown in above table have

Minor diameter 1.59 1.58 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,

M2x0.4 6H internal thread minor diameter and hardness, dimension of workpiece and tapping condition. tolerance Max. 1.679 Min. 1.567 Tolerance 0.112