Ø (mm) 24–31 12.000 31–40 10.000 40–51 8.000 51–68 6.500 67–87 5.000 87–116 4.000 116–153 3.000 153–215 2.200 215–300 2.000 300–401 1.800 62 295 ... 62 870 ..., 62 881 ..., 62 841 ..., 62 843 ... Twin G01 / Twin G04 < 2,5xD < 3,5xD < 4,5xD > 4,5xD nmax 100% nmax 60% D = D2 – [( D2 – D1 2 ) + S ] × 0,8 D = 100 – [(100 – 80 2 ) + 3 ] × 0,8 = 89,6 mm min. 1 x fz ap max ap max D S D2 D1 Rth ISO 1302 RE = 0,1 RE = 0,2 RE = 0,4 RE = 0,8 RE = 1,2 RE = 1,6 RE = 2,4 63–100 Rth63 12,5–25 N11 25 0,22* 0,32* 0,45* 0,63 0,78 0,9 1,1 40–63 Rth40 6,3–12,5 N10 12,5 0,18* 0,25* 0,36 0,51 0,62 0,72 0,88 31,5–40 Rth31,5 4,9–6,3 N9 6,3 0,16* 0,22* 0,32 0,45 0,55 0,63 0,78 25–31,5 Rth25 4,0–4,9 0,14* 0,2* 0,28 0,4 0,49 0,57 0,69 16–25 Rth16 2,5–4,0 N8 3,2 0,11* 0,16 0,23 0,32 0,39 0,45 0,55 10–16 Rth10 1,6–2,5 0,09 0,13 0,18 0,25 0,31 0,36 0,44 6,3–10 Rth6,3 1,0–1,6 N7 1,6 0,07 0,1 0,14 0,2 0,25 0,28 0,35 4–6,3 Rth4 0,8–1,0 N6 0,8 0,06 0,08 0,11 0,16 0,2 0,23 0,28 2,5–4 Rth2,5 0,4–0,8 N5 0,4 0,04 0,06 0,09 0,13 0,15 0,18 0,22 1,6–2,5 Rth1,6 0,2–0,4 N4 0,2 0,04 0,05 0,07 0,1 0,12 0,14 0,18 1–1,6 Rth1 0,1–0,2 N3 0,1 0,03 0,04 0,06 0,08 0,1 0,11 0,14 Counterboring tools The feed rate values shown are recommended values and are based on purely theoretical calculations using the above-mentioned formula. These may however deviate in practice. Maximum speed Selection of the maximum speed Twin rough boring head System / tool Boring range Maximum speed nmax in 1/min depending on the overhang length (LTA) Twin G01 applications in pre-cast / premachined holes Roughing as a "true" two-edged cutter Roughing with large allowance Roughing with large offset Roughing / Semi-Finishing Axial adjustment required 60% of the overall cutting depth ap max 40% of the overall cutting depth ap max Example: Calculation formula D2 (finished Ø) = 100 mm, D1 (raw Ø) = 80 mm, S (offset) = 3 mm Cut distribution calculation Roughness range RZ in µm Roughness index Feed rate guide values for surface finish quality *Please ensure that the feed rate values used do not exceed the corner radius (RE). Corresponds to Ra Corner radius RE in mm and feed f in mm/rev Boring and fine boring tools Technical Information
Tooling a Sustainable Future
eCatalog 2026 - EN-INT
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