
| ow carbon steels | Medium carbon steels | High carbon steels | Alloy steels | Stainless steels |
| 15〜30 15〜30 | 15〜25 | 15〜25 | 10〜25 |
●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.
Bored hole size φ1.85~φ1.82 POINT
Feed Rigid In use, please select proper bored hole diameter.
Bored hole size 1.84 1.83
Cross Unit : mm section picture of Recommended Size Class internal bored hole size
| threads | M1X0.25 | G4 | 0.90 | |||||
| M1.2X0.25 | G4 | 1.10 | ||||||
| Seam shape | Normal seams remain. | Seams remain a little. | M1.4X0.3 | G4 | 1.28 | |||
| Minor diameter | 1.62 | 1.60 | M1.6X0.2 | G3 | 1.52 | |||
| M1.6X0.35 | G4 | 1.46 |
Bored hole size 1.82 1.81
| M2X0.4 | G4 | 1.82 | |
| M2.3X0.4 | G4 | 2.12 | |
| Cross | M2.5X0.45 | G4 | 2.30 |
section
M2.6X0.45 G5 2.40
picture of
| internal | M3X0.5 | G5 | 2.77 |
| threads | No.2-56UNC | G4 | 1.98 |
| No.4-40UNC | G5 | 2.55 | |
| No.6-32UNC | G5 | 3.14 |
Seam shape Seams remain a little. No seam remains.
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.
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