Micro 100 VHMM-040-5K 1/8in 5-Flute TiB2 Carbide Corner Radius End Mill
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The Micro 100 VHMM-040-5K is a new, USA-made solid submicron-grain "Super Carbide" 5-flute variable-helix corner-radius end mill from the VHMM (Variable Helix Multi-Flute Milling) series, designed for high-efficiency milling of hardened steels and difficult alloys. Decoding the part number: VHMM = Variable Helix Multi-Flute Mill, 040 = 0.040 in (1/8 in shank / cutting diameter), 5 = 5 flutes, K = TiB2 (titanium diboride) coating — a hard, low-friction, dark/black coating optimized for dry milling and non-ferrous/hardened steel applications; the black appearance visible in photos confirms the TiB2 coating. The 5-flute variable-helix geometry suppresses chatter harmonics and increases metal removal rates versus standard equal-helix designs, while the corner radius (per the VHMM-series spec) adds edge strength and reduces corner chipping in ferrous and hardened workpiece materials. This tool accepts standard 1/8 in collet or end mill holders (ER11, ER16, or equivalent) and is manufactured in Boise, Idaho to Micro 100's tight tolerances under their "Super Carbide" submicron-grain substrate standard.
Product Specifications
| Brand | Micro 100 |
| MPN | VHMM-040-5K |
| Series | VHMM (Variable Helix Multi-Flute Mill) |
| Cutting Diameter | 0.040 in (1/16 in) |
| Shank Diameter | 1/8 in (0.125 in) |
| Number of Flutes | 5 |
| End Type | Corner Radius |
| Helix Type | Variable Helix |
| Substrate | Submicron-grain solid carbide |
| Coating | TiB2 (Titanium Diboride) — K suffix |
| Coating Color | Black (visible in photos) |
| Country of Origin | USA (Made in U.S.A. — per label) |
| Condition | New |
| Shank Type | Straight (cylindrical) |
| Compatible Holders | ER11, ER16 collet, 1/8 in end mill holder |