Product Overview

The FMB Face Mill Chuck (also known as a Shell Mill Arbor) is an indispensable tool holder for any CNC milling machine or machining center. It is specifically designed to hold indexable face milling cutters (shell mills) used for squaring blocks, facing large plates, and heavy metal removal. Because face mills have large diameters and generate massive cutting forces, they cannot be held by standard collets. The FMB holder solves this by utilizing a solid central pilot (spigot) to center the cutter perfectly, combined with two heavy-duty drive keys that lock into the back of the cutter to transmit extreme spindle torque without slipping.

Key Features & Advantages

• High Rigidity Construction: Forged from premium alloy steel (such as 20CrMnTi) and case-hardened to HRC 56-60. The robust core provides exceptional dampening against the heavy vibrations generated during interrupted cuts and high-feed milling.

• Precision Ground Pilot: The central mounting pilot (the FMB diameter) and the taper are precision-ground to ensure a maximum Total Indicator Runout (T.I.R.) of ≤ 0.005mm. This guarantees that all carbide inserts on your face mill engage the material evenly, extending insert life and improving surface finish.

• Heavy-Duty Drive Keys: Integrated, oversized drive keys fit perfectly into the slots of standard metric face mills, ensuring 100% positive torque transmission from the machine spindle to the cutting edge, preventing cutter slippage under heavy loads.

• Coolant-Through Capability: Many of our FMB holders are available with through-spindle coolant (AD/B form) options, directing high-pressure cutting fluid directly to the cutting zone for superior chip evacuation and thermal control.

• Dynamic Balancing: Available with high-speed dynamic balancing (e.g., G2.5 @ 20,000 RPM) to protect your machine's spindle bearings and ensure smooth operation at high surface speeds.

Why Partner with Pingyuan Zhenghao Machinery?

• Direct Manufacturer Savings: Bypass trading companies and source heavy-duty CNC tool holders directly from our factory for highly competitive wholesale pricing.

• Comprehensive Size Range: We manufacture the complete metric FMB series, including FMB16, FMB22, FMB27, FMB32, FMB40, FMB50, and FMB60 to accommodate face mills from 40mm up to 250mm+ in diameter.

• All Major Spindle Tapers: Available in BT30, BT40, BT50, SK40, SK50, CAT40, CAT50, HSK63A, HSK100A, NT, and MT shanks.

• Complete Package: Every FMB chuck comes standard with the heavy-duty locking screw/bolt required to secure the face mill to the arbor.

Frequently Asked Questions (FAQ) - Selection Guide

Q1: What does "FMB22" or "FMB27" mean?

A: The "FMB" designation refers to the metric standard for face mill mounting. The number that follows (e.g., 22, 27, 32) is the exact diameter in millimeters of the central pilot (the protruding cylinder) on the tool holder.

• FMB22 has a 22mm pilot and fits face mills with a 22mm inner bore (typically 50mm or 63mm outer diameter cutters).

• FMB27 has a 27mm pilot and fits face mills with a 27mm inner bore (typically 80mm outer diameter cutters).

Q2: How do I choose the correct FMB holder for my face mill?

A: You must match the inner bore diameter of your face milling cutter to the pilot diameter of the FMB holder. If your cutter has a 32mm center hole, you must purchase an FMB32 holder. You also need to select the correct taper (e.g., BT40) to match your CNC machine's spindle.

Q3: What is the difference between FMB and FMA holders?

A: Both are metric face mill standards. FMB is the most common and uses a central locking screw that threads into the pilot to hold the cutter down. FMA is typically used for very large diameter face mills (usually over 160mm) and uses four separate mounting bolts that pass through the cutter body into the face of the tool holder, rather than a single central screw.

Q4: Does the holder include the locking screw and drive keys?

A: Yes! All of our FMB face mill chucks come fully assembled with the integrated drive keys and include the central locking cross-screw required to secure your cutter.

Achieve maximum metal removal rates and flawless surface finishes with our Precision FMB Face Mill Chucks.

Contact our sales team today for a complete catalog and bulk pricing.