Roll Tap Series Spiral Fluted Taps (for blind hole) SURZ SU Thread Forming Taps Spiral Fluted Taps (for through hole) Specification Coating 1.5D Spiral Pointed Taps (for through hole) Recommended Tapping Speeds depending on Materials ow carbon steels Medium carbon steels High carbon steels Alloy steels Stainless steels 15〜30 15〜30 15〜25 15〜25 10〜25 Hand Taps 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. Cemented Carbide Taps ●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 Roll Taps Tapping condition [ M2×0.4 ] Work material SUS304 Tapping length 5.2mm(Blind hole) Bored hole size φ1.85 ~φ1.82 POINT Special Thread Taps Simple Inspection Tools Tapping speed 5m/min Feed Rigid In use, please select proper bored hole diameter. Tapping Vertical direction Machine Machining center (BT15) Pipe Taps Tapping fluid Water soluble oil (×20) Bored hole size φ 1.84 φ 1.83 Recommended bored hole diameter before tapping Cross Unit : mm Thread Mills section picture of Size Class Recommended 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 φ 1.62 φ 1.60 M1.6X0.2 G3 1.52 Dies M1.6X0.35 G4 1.46 Bored hole size φ 1.82 φ 1.81 M1.7X0.35 G4 1.56 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 M3X0.5 G5 2.77 Center Drills internal threads No.2-56UNC G4 1.98 No.4-40UNC G5 2.55 Seam shape Seams remain a little. No seam remains. No.6-32UNC G5 3.14 Minor diameter φ 1.59 φ 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 Centering Tools M2x0.4 6H internal thread minor diameter and deformation can slightly change depending on material, hardness, dimension of workpiece and tapping condition. tolerance Max. 1.679 Min. 1.567 Tolerance 0.112 JIS RO-25 520 For improvement, spec may change without advance notice.