Solid Drills — Full Specifications

Designation example: 1A0012-02000.h7.3XD.140.R02.HA.C95

Symbol legend used throughout the family tables

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UN — HL 0012 high-performance twist drills (Ø2.0–20.0mm, h7, ≤3xD, σ=140°, γₛ=30°)

Full d₁ range runs in 0.1mm steps from 2.0–20.0mm across four shank-length breakpoints. HL 0012 ≤5xD variants and HL 0014 (3.0–20.0mm, ≤8xD/≤12xD, σ=135°) tables available on request.

UN — HPC MB 0026 micro drills with cooling booster (Ø0.8–3.0mm, h6, ≤25xD, σ=128°, γₛ=30°)

The cooling booster feeds coolant close to the cutting edge on these micro-diameter drills. Same family also offered at ≤5xD (0025, m6), ≤8xD, ≤12xD, ≤16xD, ≤20xD, and ≤30xD depths — full tables available on request. UN — TLB deep-hole drills (16xD–50xD, Ø3.0–19.0mm) also available.

ST — HPC TF 0105 through-coolant twist drills (Ø17.7–19.8mm, h7, ≤3xD, σ=140°, γₛ=30°)

Same HPC TF family also offered as 0109 (m6, ≤8xD, σ=140°, γₛ=30°) down to Ø2.0mm, and 0101 (h7, ≤12xD, σ=135°, γₛ=30°) — 11 depth/ tolerance combinations spanning 3xD to 12xD in total, full tables available on request.

ST — A spot drills (Ø2.0–20.0mm, js8, σ=120°, γₛ=30°)

Spot drills are also available with 90° and 142° point angles for matching different subsequent drilling operations.

VA — HL high-performance twist drills, heat-resistant alloys (Ø17.4–20.0mm, m7, ≤3xD, σ=135°, γₛ=30°)

VA — HL is also offered at ≤5xD depth. TI — HL (titanium, m7, ≤5xD, σ=140°) full range available on request.

AL — HPC twist drills, aluminium (Ø2.0–6.7mm, p6, ≤5xD, σ=140°, γₛ=15°)

This drill is marked as the pilot drill for the matching deep-hole drills 1216, 1220, 1225, and 1230 — drill the pilot hole first, then follow with the deep-hole drill for depths beyond 5xD. Full AL — HPC (3xD/8xD/12xD) and AL — TLB deep-hole (16xD–30xD) tables available on request.

H — HPC twist drills, hardened steel (Ø2.6–7.4mm, h7, ≤3xD, σ=140°, γₛ=30°)

Suited to hardened tool steel; full diameter range up to Ø14.0mm available on request.

Deep-hole drilling procedure

For depths beyond standard drill lengths, Galtona recommends a two-stage approach: drill a pilot hole first with a shorter, more rigid drill (tolerance p6), then follow with the matching deep- hole drill (TLB family, tolerances h7/j6/fg6 depending on depth, available up to 50xD). Speed and feed should be reduced when entering the pilot hole, and the drill should be retracted to around 1×Ø before reducing spindle speed to approximately 300 rpm and withdrawing at rapid feed (vf ≈ 3000 mm/min).

Caution: never run any deep-hole drill with a high number of revolutions out of a pilot hole.

Example cutting-data table (index / material / Vc / fu by diameter band)

Values vary per tool family and diameter band — every family page in the catalogue carries its own complete Vc/fu table across ~40 material sub-groups (steels, stainless, cast iron, non-ferrous, titanium, and hardened tool steel by HRC band).