QCKB – INNOT insert

QCKB

Ground double-ended insert for precision grooves, with universal chipbreaker and INNOT PVD grades.

ISO M

Precision grooves

Ground

PVD

★ IT7225

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Technical data sheet PDFCutting data, sizes and grades

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INNOT grades

CVD, PVD and cermet for ISO P, M, K, S

Standard ISO designation

Compatible with the insert holders you use

Technical support

We help you choose grade and chipbreaker

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Description

Specifications

Code Width CW Corner radius RE INSL Available grades
QCKB2002 2.0 mm (±0.02) 0.2 16.0 IT7125 – IT7225
QCKB2502 2.5 mm (±0.02) 0.2 18.5 IT7125 – IT7225
QCKB3004 3.0 mm (±0.02) 0.4 21.0 IT7125 – IT7225
QCKB4004 4.0 mm (±0.02) 0.4 21.0 IT7125 – IT7225
QCKB5008 5.0 mm (±0.02) 0.8 26.0 IT7125 – IT7225

CW = cutting width, RE = corner radius, INSL = insert length (mm).

QCKB insert data sheet

Operation Precision grooves (ring seats, grooves to size)
ISO material M (stainless steels)
Type Two cutting edges, ground
Tolerance K – width ±0.02 mm
Features Ground insert with a tight width tolerance: ideal when the groove size must be achieved in a single plunge. Universal chipbreaker for consistent behaviour on different materials.
Compatible toolholders Toolholders for external and face grooves, boring bars for internal grooves

Available INNOT grades

Grade ISO Coating Composition Application
IT7125 M PVD AlTiN Universal grade for turning stainless steel in continuous and interrupted cuts. Smooth, low-friction coating, high nano-hardness and excellent oxidation resistance.
IT7225 ★ M PVD AlTiSiN + TiSiN First-choice grade for turning stainless steel. Nano-gradient coating on a sub-micron grain substrate: excellent wear resistance and toughness.

★ Recommended grade for this insert. CVD = chemical vapour deposition coating, PVD = physical vapour deposition coating.

Recommended cutting data

Printable cutting data tableAll the data on this page in an INNOT PDF to keep in the shop.Download PDF
Parting and grooving – cutting speed

Cutting speed Vc (m/min) as a function of feed fn (mm/rev)

Material HB Rm (N/mm²) IT7225
fn 0.1 fn 0.3 fn 0.5
NON-ALLOY STEELS
C≤0.25% – Annealed 125 428 260 180 120
0.25<C≤0.55% – Annealed 190 639 200 140 105
0.25<C≤0.55% – Quenched and tempered 210 708 120 110 100
C>0.55% – Annealed 190 639 130 120 110
C>0.55% – Quenched and tempered 300 1013 110 95 70
Short-chipping – Annealed 220 745 120 105 90
LOW-ALLOY STEELS
Annealed 175 591 170 135 120
Quenched and tempered 300 1013 105 90 70
Quenched and tempered 380 1282 160 80 60
STAINLESS STEELS
Ferritic / martensitic – Annealed 200 675 200 150 105
Martensitic – Quenched and tempered 330 1114 150 115 70
Austenitic – Solution annealed 200 675 185 155 125
Precipitation-hardening austenitic (PH) 300 1013 165 135 95
Austenitic-ferritic (duplex) 230 778 145 110 85

Guide values for machining with coolant. For parting and internal grooving reduce the speed by 30–50%. When parting, as you approach the centre of the part, reduce the feed by 30%.

Tips for use

  • Parting off: when approaching the centre reduce the feed by 30% for longer life and a better finish; keep the tool overhang to a minimum.
  • External grooving and side turning: with depths over 0.5 mm work in radial passes (up to 0.75 × insert width), retract 0.1 mm, then an axial pass.
  • Wide grooves: make side-by-side stepped plunges, then finish the bottom and the flanks.
  • Face grooves: start from the largest diameter and move inwards; for finishing machine the bottom and the outer diameter first, then the inner one.
  • Internal grooves: work from the inside outwards to help the chip out.