Product Features
High Rigidity and Precision
Specifically designed for face milling cutters up to 125mm in diameter, FMB tool holders have an integrated screw and drive key design. They easily achieve mirror-finish surface quality because their Total Indicator Runout (TIR) is controlled within 0.005mm, a tolerance ten times stricter than that of traditional side-lock holders.
Materials and Manufacturing
These holders, which are mostly made of 42CrMo or 40Cr alloy steel, have core hardnesses between HRC 44 and 62. Critical load-bearing surfaces are subjected to specific treatments including precision grinding, blackening, and carburization (down to a depth of 1/32 inch). With a guide diameter tolerance of only ±0.002mm to provide zero-point clamping for modular milling cutters, some premium versions in the BT series achieve AT3 taper precision.
Dynamic Balancing Classification
Separated into two levels. High-speed machining applications (like HSK or Bright-tools models) have a standard grade of G2.5 (20,000–30,000 RPM), while standard machining applications (like BT40 models) have a standard balance grade of G6.3 (up to 10,000 RPM). Internal-coolant models can operate at full load up to 28,000 RPM. Because of its incredibly low residual imbalance (<2 g·mm), the high-frequency vibrations typical of 6-tooth face milling cutters are completely eliminated.
Application Scenarios
Aerospace & Mold Making
Perfect for heavy-duty cutting of 316L stainless steel weld seams and semi-finishing titanium alloys (such Ti-6Al-4V). Surface roughness continuously maintains an ISO N9 grade, and positional deviation is regulated within 5 microns even at cutting depths of 0.8–1.5 mm.
Heavy Equipment Manufacturing
Large-diameter face milling cutters with diameters between 100 and 160 mm are the typical option. For example, a BT50-FMB40 holder, designed specifically for milling the frames of big cast steel components, can consistently bear a torque of 260 N·m when used to clamp a 160 mm face mill.
Automotive Molds & Deep-Cavity Machining
Sometimes used to clear deep voids in big automobile die-casting molds using extended FMB holders with overhangs of up to 300 mm. Even while machining high-temperature alloys, its dual-keyway design (with a hardness of HRC 60) guarantees an incredibly strong interlock, preventing any slippage at all (reaching a metal removal rate of up to 150 cc/min). Tool changeover only takes 8 seconds when combined with an HSK interface, which makes it ideal for automated manufacturing lines.
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