Micro 100 BLR-250-4X 1/4in 4-Flute Long Reach Carbide Ball End Mill
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The Micro 100 BLR-250-4X is a new, USA-made solid carbide ball-nose end mill from the "Super Carbide" BLR (Ball Long Reach) series, featuring a 1/4 in (0.250 in) cutting diameter, 4-flute configuration, and an extended-reach neck for deep-cavity milling operations. The tool is coated with a black physical vapor deposition (PVD) coating — consistent with Micro 100's AlTiN or TiN-based treatments — which enhances hardness, lubricity, and heat resistance for improved tool life in ferrous and hardened materials. The "X" suffix in the part number designates the extra-long reach variant, providing greater axial depth access while the reduced neck behind the ball minimizes wall contact and deflection in confined features. This end mill is compatible with standard 1/4 in collets and end mill holders (ER16, ER20, ER32, and similar), and is well-suited for 3D contouring, die/mold work, and finishing passes in steel, stainless, cast iron, and hardened alloys on CNC machining centers.
Product Specifications
| Brand | Micro 100 |
| MPN | BLR-250-4X |
| Series | BLR — Ball Long Reach |
| Cutting Diameter | 0.250 in (1/4 in) |
| Number of Flutes | 4 |
| End Type | Ball Nose |
| Reach | Extra-Long (X suffix) |
| Shank Diameter | 0.250 in (1/4 in) |
| Material | Solid Carbide |
| Coating | PVD Black (AlTiN-type) |
| Country of Origin | USA |
| Condition | New |
| Shank Type | Straight |