Engineered for high-precision finishing of hardened steels 55-68HRC. 45° helix geometry with Balzers DR coating delivers superior wear resistance and Ra≤0.4μm surface quality on pre-hardened & quenched components.
| MOQ | 1 pc (sample/stock) | 50 pcs (OEM/bulk) |
|---|---|
| Lead Time | 3–5 days (standard stock) | 10–15 days (custom/OEM) |
| Inventory | Ø4.0–Ø12.0 in stock. Ø14.0–Ø20.0 available on short notice. |
| Custom Options | Extended lengths, slim shanks, alternative coatings, laser marking, private packaging |
| Packaging | Individual vacuum blister + anti-rust paper | Rigid export cartons (50/100 pcs) |
| Shipping | DHL/FedEx/UPS for samples | Air/Sea freight for bulk. Incoterms: EXW, FOB, CIF, DDP |
| Model | D (mm) | d (mm) | H (mm) | L (mm) | Stock |
|---|---|---|---|---|---|
| HM-4F-1-3-4-50 | 1.0 | 4 | 3 | 50 | ● |
| HM-4F-1.5-4.5-4-50 | 1.5 | 4 | 4.5 | 50 | ● |
| HM-4F-2-6-4-50 | 2.0 | 4 | 6 | 50 | ● |
| HM-4F-2.5-7.5-4-50 | 2.5 | 4 | 7.5 | 50 | ● |
| HM-4F-3-9-4-50 | 3.0 | 4 | 9 | 50 | ● |
| HM-4F-3-9-3-50 | 3.0 | 3 | 9 | 50 | ● |
| HM-4F-3-12-3-75 | 3.0 | 3 | 12 | 75 | ● |
| HM-4F-3-15-3-100 | 3.0 | 3 | 15 | 100 | ● |
| HM-4F-3.5-10-4-50 | 3.5 | 4 | 10 | 50 | ● |
| HM-4F-4-10-4-50 | 4.0 | 4 | 10 | 50 | ● |
| HM-4F-4-16-4-75 | 4.0 | 4 | 16 | 75 | ● |
| HM-4F-4-20-4-100 | 4.0 | 4 | 20 | 100 | ● |
| HM-4F-5-13-5-50 | 5.0 | 5 | 13 | 50 | ● |
| HM-4F-5-13-5-50 | 5.0 | 5 | 13 | 50 | ● |
| HM-4F-5-20-5-75 | 5.0 | 5 | 20 | 75 | ● |
| HM-4F-5-25-5-100 | 5.0 | 5 | 25 | 100 | ● |
| HM-4F-6-15-6-50 | 6.0 | 6 | 15 | 50 | ● |
| HM-4F-6-24-6-75 | 6.0 | 6 | 24 | 75 | ● |
| HM-4F-6-30-6-100 | 6.0 | 6 | 30 | 100 | ● |
| HM-4F-8-20-8-60 | 8.0 | 8 | 20 | 60 | ● |
| HM-4F-8-30-8-75 | 8.0 | 8 | 30 | 75 | ● |
| HM-4F-8-35-8-100 | 8.0 | 8 | 35 | 100 | ● |
| HM-4F-10-25-10-75 | 10.0 | 10 | 25 | 75 | ● |
| HM-4F-10-40-10-100 | 10.0 | 10 | 40 | 100 | ● |
| HM-4F-12-30-12-75 | 12.0 | 12 | 30 | 75 | ● |
| HM-4F-12-45-12-100 | 12.0 | 12 | 45 | 100 | ● |
| HM-4F-14-45-14-100 | 14.0 | 14 | 45 | 100 | ● |
| HM-4F-16-45-16-100 | 16.0 | 16 | 45 | 100 | ● |
| HM-4F-18-45-18-100 | 18.0 | 18 | 45 | 100 | ● |
| HM-4F-20-45-20-100 | 20.0 | 20 | 45 | 100 | ● |
● In stock | ○ Make-to-order | Full range: Ø4.0–Ø20.0. Tolerance: D≤12 → 0~-0.020mm | D>12 → 0~-0.030mm. CAD/STEP files available.
Higher helix angle reduces axial cutting force during hardened steel finishing, enabling smoother tool engagement, reduced vibration, and consistent Ra≤0.4μm surface quality on 55-68HRC materials.
Diamond-like Carbon coating (~3000 HV) with low friction coefficient. Minimizes edge wear, prevents built-up edge, and extends tool life by 30-50% in continuous hardened steel finishing cycles.
Specialized substrate + edge prep allows stable finishing of pre-hardened and quenched steels 55-68HRC without micro-chipping or premature flank wear.
Larger core diameter minimizes tool deflection during hardened steel finishing. Four cutting edges distribute load evenly, maintaining tight tolerances and superior surface quality.
| Workpiece | Hardness | Suitability | Notes |
|---|---|---|---|
| Pre-hardened / Quenched Steel | 55-68 HRC | ◎ Excellent | Optimized for mold finishing, die repair & hardened components |
| Tool Steel (D2, A2, H13) | 55-65 HRC | ◎ Excellent | Stable for tool & die finishing operations |
| Bearing Steel (GCr15) | 58-65 HRC | ◎ Excellent | High-precision finishing of bearing races & components |
| Carbon/Alloy Steel | <55 HRC | ○ Limited | Use PM series for better cost efficiency on softer materials |
◎ = Very Suitable | ○ = Limited | ✗ = Not Recommended | HM Series is engineered specifically for hardened steels 55-68HRC. For materials <55HRC, please use our PM Series. For stainless steel & titanium alloys, please use our SM/TM Specialized Series.
✅ Side Finishing: ae = 0.02D–0.04D, ap = 0.3D–0.5D, Vc = 60–90 m/min
✅ Hardened Steel (60-68HRC): Reduce Vf by 15–20%, maintain ae ≤ 0.02D to protect cutting edge
✅ Surface Finish (Ra≤0.4μm): Use ae = 0.01D–0.02D with consistent chip load
✅ Use climb milling to maximize 45° helix advantage and surface quality
⚠️ Use high-precision collets/chucks. Runout must be <0.003mm for hardened steel finishing
⚠️ Minimize overhang. For L/D > 4, reduce feed by 20% to prevent harmonic vibration
⚠️ Balzers DR performs best with air blow or minimum quantity lubrication (MQL)
⚠️ Avoid full-width slotting. Use ramping or helical interpolation for pocket entry
Precision finishing of D2, A2, H13, and hardened inserts (55-68HRC). Achieves Ra≤0.4μm with minimal polishing required for mold repair operations.
Finishing of punches, dies, and tooling components. 45° helix ensures dimensional stability & surface integrity on 55-65HRC tool steels.
High-precision finishing of bearing races, shafts, and components. Balzers DR coating withstands abrasive wear on 58-65HRC bearing steels.
🔹 Substrate: Ultra-fine carbide (0.3μm grain) with specialized heat treatment for 55-68HRC stability
🔹 Grinding: 5-axis CNC maintains 45° helix ±0.5° & runout <0.003mm for consistent hardened steel finish
🔹 Coating: Balzers DR (Diamond-like Carbon) layer (2.0–3.0μm) applied under controlled conditions for maximum adhesion
🔹 Inspection: 100% laser diameter check, coating thickness verification, and hardness penetration test
🔹 Traceability: Each batch includes laser-etched SKU, grinding date, coating certificate, and QC report. Available upon request.
Specify your diameter range, material, and monthly volume. We respond with pricing, stock status within 24 hours.
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