Carmex MTS 0250 C25 40 UN MT7 1/4in 40 UN Solid Carbide Thread Mill
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The Carmex MTS 0250 C25 40 UN MT7 is a new solid carbide miniature thread milling cutter from Carmex's MTS (Miniature Thread and Slot) series, designed to produce UN (Unified National) thread forms with a 40 TPI pitch in a 1/4 in (0.250 in) cutting diameter. The tool features a tapered neck (visible in photos) between the cutting head and the cylindrical shank — a geometry characteristic of the Carmex MTS line — which provides clearance when milling threads in small-diameter bores, preventing shank interference. Grade MT7 is Carmex's uncoated ultra-fine grain carbide substrate optimized for non-ferrous materials, plastics, and other soft-to-medium materials where a bright (uncoated) finish reduces built-up edge; the C25 designation indicates a 1/4 in (6.35 mm) cylindrical shank diameter and 40 mm overall length. This single-piece thread mill is used on CNC machining centers with helical interpolation to produce internal threads, offering the advantage of generating multiple thread pitches and both right- and left-hand threads with a single tool.
Product Specifications
| Brand | Carmex |
| MPN | MTS 0250 C25 40 UN MT7 |
| Series | MTS (Miniature Thread & Slot) |
| Cutting Diameter | 0.250 in (6.35 mm) |
| Shank Diameter | 0.250 in (6.35 mm) — C25 |
| Overall Length | 40 mm — encoded as 40 in designation |
| Thread Standard | UN (Unified National) |
| Thread Pitch | 40 TPI |
| Carbide Grade | MT7 (Carmex ultra-fine grain, uncoated) |
| Coating | None (bright/uncoated) |
| Tool Type | Solid carbide thread mill |
| Neck Geometry | Tapered neck relief |
| Application | Internal UN thread milling via helical interpolation |
| Condition | New |