Product Overview

While dedicated taper arbors (like BT40-FMB22) are the standard for face milling, they aren't always the most practical solution. Sometimes you need to reach deep into a workpiece where a bulky machine taper won't fit, or you need to quickly mount a small face mill in a lathe's live tooling block or a 5-axis milling head. The Straight Shank Shell End Mill Arbor provides the perfect flexible solution. By utilizing a precision-ground cylindrical shank (C-type), this arbor can be securely clamped into an ER collet chuck, a high-precision milling chuck, or a side-lock holder. The business end features a standard FMB spigot and drive keys, allowing you to mount standard metric indexable shell mills exactly as you would on a dedicated taper arbor.

Key Features & Advantages

• Maximum Versatility: The straight cylindrical shank allows this arbor to be held in virtually any tool holding system (ER collets, SK/SKS collets, hydraulic chucks, milling chucks, or Weldon holders), making it incredibly adaptable across different machines (mills, lathes, Swiss-type autos).

• Extended Reach Capability: Available in various shank lengths, these arbors act as rigid extensions, allowing your face mill to reach past fixtures, clamps, or deep into pockets where a standard short taper arbor would cause a collision.

• High Precision FMB Pilot: The straight shank and the metric FMB pilot (e.g., 22mm, 27mm) are precision-ground simultaneously between centers. We guarantee a maximum Total Indicator Runout (T.I.R.) of ≤ 0.005mm (5 microns), ensuring all inserts on your face mill engage the material evenly for superior surface finishes.

• Heavy-Duty Drive Keys: Integrated, hardened drive keys perfectly match the keyways on standard metric shell mills, transmitting cutting torque directly from the arbor to the cutter without slipping.

• Premium Material & Hardness: Forged from high-quality alloy steel (such as 20CrMnTi) and case-hardened to HRC 56-60, providing the rigidity needed to absorb the interrupted cutting forces of face milling.

• Includes Locking Screw: Every arbor comes complete with the heavy-duty central locking screw required to secure the face mill.

Why Partner with Pingyuan Zhenghao Machinery?

• Direct Manufacturer Savings: Bypass trading companies and source precision milling accessories directly from our factory for highly competitive wholesale pricing.

• Comprehensive Size Range: We manufacture all standard combinations of straight shanks and FMB pilots:

• Shanks: C16 (16mm), C20 (20mm), C25 (25mm), C32 (32mm).

• Pilots: FMB16, FMB22, FMB27, FMB32.

• Custom Lengths Available: Need a specific extension length for a difficult job? We can manufacture custom straight shank arbors to your exact specifications.

• Strict Quality Control: Every arbor undergoes rigorous inspection using 3D CMMs and micrometers to verify shank diameter, pilot diameter, and overall concentricity before packaging.

Frequently Asked Questions (FAQ) - Selection Guide

Q1: How do I hold a straight shank arbor securely?

A: The best method depends on the application:

• For maximum rigidity (heavy milling): Hold the straight shank in a Power Milling Chuck or a Side-Lock (Weldon) holder (if the shank has a flat, or if you request a flat to be ground).

• For general milling and clearance: Hold it in a high-quality ER Collet Chuck (e.g., ER32 or ER40). Ensure the collet is tightened to the correct torque specification to prevent the shank from slipping or pulling out.

Q2: What does "C20-FMB22" mean?

A: This is the standard sizing nomenclature:

• C20: Indicates a straight cylindrical shank with a diameter of exactly 20mm.

• FMB22: Indicates the pilot (the part that holds the cutter) is a metric FMB style with a 22mm diameter, designed to hold a face mill with a 22mm center bore.

Q3: Can I use this for heavy roughing?

A: While straight shank arbors are very rigid, they are generally not recommended for the absolute heaviest roughing cuts compared to a dedicated, single-piece taper arbor (like a CAT40-FMB). Because you are introducing a secondary connection (the collet chuck holding the straight shank), there is a slight loss of rigidity. They are best suited for medium milling, finishing, or when extended reach is mandatory.

Q4: Does the arbor include the screw to hold the cutter?

A: Yes, all of our Straight Shank Shell End Mill Arbors come fully assembled with the central locking screw and the drive keys installed.

Expand your milling capabilities and reach deep cavities with our Precision Straight Shank Shell End Mill Arbors.

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