CAT 50 50 Em End Mill Holder, 1" x 4", H5, AT3, G2.5, 1" x 8, Alloy Steel, Precision Tool

The CAT 50 end mill holder, model 50 EM 1 inch x 4 inch, is a precision toolholding component designed for industrial milling applications. It features a CAT 50 taper shank and is engineered to accommodate cutting tools with a 1-inch diameter shank. This specific holder provides a 4-inch projection or gage length from the spindle face. Technical specifications for this class of tool holder typically include a bore I.D. manufactured to meet or exceed H5 specifications for improved concentricity and reduced total indicated runout (T.I.R.), which contributes to extended tool life. The taper is ground to AT3 specifications to ensure maximum contact with the machine spindle. Constructed from hardened alloy steel, these holders are often balanced to G2.5 at 20,000 to 25,000 RPMs to minimize vibration during high-speed operations. The rear thread for the pull stud is standard for CAT 50 tooling, commonly 1 inch x 8. This holder is suitable for heavy-duty side loads and is designed for use across all CAT 50 machining centers.