National Machine Tool Company
Providing Keyway Solutions Since 1903

National Machine Tool Company | National Machine Tool Company Providing Keyway Solutions Since 1903

Manufacturers of keyseat millers since 1903, these machine tool attachments mill full depth keyways in blind bores without relief or open end bores-always in one pass. For use in gears, impellers, stub shafts, couplings, pump sleeves-any part requiring an internal keyway or slot. Closed-end oil slots, straight splines, radius arc splines, slots with radius corners, full radius, V-shaped, or two-step keyways can be produced. Our tools work in a variety of metals including all stainless, 4140, and proprietary exotics. Our company offers a complete line of stock tools ranging from 1/2" to 3-1/2" diameter with an array of cutter widths to meet customer requirements. Custom designs are also available for most applications. Tooling is manufactured for manual machines and can be adapted for use with CNC equipment. As an alternative to EDM, right angle heads, or single point tools our millers create a faster turnaround at significant cost savings.