Sometimes the best way to talk about toolholders is to start with the interface itself and why it exists. AKKO’s rotary milling toolholder lineup includes the BT interface, one of the most widely used standards on CNC machining centers.

AKKO focuses on producing holders that follow the BT standard closely, with the correct geometry, balanced construction, and consistent spindle contact that shops rely on for repeatable milling performance.

AKKO BT holders are based on the ISO 7388 steep-taper standard with a 7:24 taper ratio. A defining characteristic of the BT design is symmetry at the flange—both drive dog slots are the same depth and geometry. This symmetry contributes to more consistent balance compared to asymmetric flange designs.

BT rotary toolholders are commonly used in CNC machining centers in sizes BT30, BT40, and BT50. The system traces back to the MAS 403 BT standard established by the Japan Machinery Association. While the “BT” designation is often associated with British Taper, the modern BT interface is globally recognized as a Japanese-developed, symmetrical steep-taper system designed for reliable use with automatic tool changers.

As was stated above both drive dog slots on a BT holder are the same depth and geometry. That symmetry makes BT holders inherently easier to balance compared to CAT holders, where one drive dog keyway is deeper than the other. At higher spindle speeds, that asymmetry matters. Imbalance shows up as vibration, spindle load, and reduced surface finish.

It should also be stated, that although we call the key's in the taper face "drive dogs" they don't actually drive anything. The are for orientation and the taper connection is what is doing the driving. 

Because of this, BT holders are widely used in machining centers where balance consistency is important, particularly as spindle speeds increase. AKKO BT holders follow the standard flange and taper geometry, allowing predictable seating and repeatability from tool change to tool change.

BT End Mill Holders
AKKO BT end mill holders are designed to clamp straight-shank cutters directly. The effective gripping range (DCONWS) spans from smaller tool diameters up through larger cutters, making them suitable for general milling and slotting. Based on the AKKO product pages:

• BT end mill holders accept shank sizes of approximately 6 mm to 40 mm (roughly 1/4" to 1-9/16") depending on the specific holder size.
• The smaller holders serve light to medium milling cutters; the larger sizes support heavier cutters where tool rigidity is more critical.

These ranges cover the majority of solid end mills used in standard machining center operations. Exact bore capacity should be referenced on the specific BT holder drawing.

BT ER Collet Chucks (Mini)
AKKO BT mini ER collet chucks are compact collet holders with reduced body length and smaller flange diameter compared to full-size BT ER holders. The “mini” designation reflects:

• Shorter retention length for tighter work envelopes
• Smaller overall outside diameter to clear fixturing or adjacent tooling
• Lower projected mass for reduced drawbar load

Typical ER series offered in the BT mini format include ER16 and ER20 ranges. These support shank sizes from approximately 1 mm to 13 mm (roughly 1/32" to 1/2") depending on the particular collet installed.

BT ER Collet Chucks (Standard)
AKKO BT ER collet chucks use standard ER series clamping (ER16, ER25, ER32, and ER40). These holders accept a wide range of cutter shank diameters when fitted with the correct collet. Here's a quick cheat sheet on that correct range.

• ER16 – clamping range ~1 mm–10 mm (1/32"–3/8")
  
• ER25 – clamping range ~3 mm–16 mm (1/8"–5/8")
• ER32 – clamping range ~3 mm–20 mm (1/8"–3/4")
• ER40 – clamping range ~6 mm–26 mm (1/4"–1")

These ranges reflect standard ER series capacity. Actual usable range depends on installed collet and tool shank.

BT Shell Mill Holders
AKKO BT tooling also supports larger indexable milling cutters used for heavier material removal. Face mills, or shell mills, depending on what the kids want to call it,  are typically mounted on dedicated BT shell mill holders, which locate the cutter on a precision ground pilot and, in this case, do  transmit torque through drive keys and mounting screws. 

AKKO BT shell mill holders locate the cutter with a pilot and clamp it with outer screws. The pilot bore (DCONWS) sizes correspond to:

• 16 mm (0.630") pilot – commonly paired with cutters roughly 32 mm–40 mm (1.25"–1.57") diameter
• 20 mm (0.787") pilot – paired with cutters roughly 40 mm–50 mm (1.57"–1.97") diameter
• 25 mm (0.984") pilot – paired with cutters roughly 50 mm–63 mm (1.97"–2.48") diameter
• 32 mm (1.260") pilot – paired with cutters roughly 63 mm–100 mm (2.48"–3.94") diameter
• 40 mm (1.575") pilot – paired with cutters roughly 100 mm–160 mm (3.94"–6.30") diameter
  
  

These ranges reflect typical shell and face mill offerings on the market where pilot bore size increases with cutter diameter to maintain rigidity and torque capacity.

South Carolina's  manufacturing sector is growing at a record pace that shows no signs of slowing, from global manufacturing headquarters to expanding advanced operations. Greenville County alone has averaged manufacturing employment growth of more than 17% over the last decade.
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That momentum makes Greenville the ideal hub for small and medium-sized manufacturers across the Southeast to come together, share ideas, and discover the latest technology that keeps shops competitive.
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We’re bringing a lineup of high-performance tooling and workholding partners that solve real problems on the shop floor:

• AB Tool – Home of the Shear Hog and AccuHold! Special carbide cutting tools delivered in 3–6 days.
• MAQ – Vibration-damped tool holders for internal turning operations from 3xD up to 15xD. 
• Microconic by Masa Tool – Subspindle workholding for Swiss & CNC lathes
• Pratt Burnerd America – Precision lathe chucks and workholding systems
• Soph Magnetics – Magnetic workholding and material handling solutions

While you’re at the show, make sure to stop by our other partners right in our aisle!

• AKKO - Booth 1934 –  A global leader in precision tooling since 1986, AKKO delivers high‑performance rotary toolholders, turning and milling toolholders, and a broad range of precision carbide inserts—tailored for minimal vibration, exceptional surface finish, and versatility across applications
• Blue Photon Technology & Workholding Systems LLC – Booth 1929 - They offer an innovative, patented adhesive workholding system—ideal for gripping complex or delicate parts without distortion, and enabling full 5- or 6-sided access, even in heavy milling of titanium and superalloys.
• EWS USA/ Command Tooling – Booth 1932 - EWS is a global expert in live and static toolholders and modular machining systems; in North America, they operate through the U.S.-based Command Tooling facility, offering precision solid and rotary toolholders under both brands.
• Jergens Workholding – Booth 1928 - A worldwide leader in custom CNC workholding—including vises, clamps, fixturing systems, and their patented Ball Lock® mounting and Fixture‑Pro® 5-Axis solutions—a go-to for boosting set‑up speed and machining productivity. You can also check out the workholdig in action just across the Aisle in the Innova Machine Tool Booth.  They are featuring Jergens workholding on their WSI WVM380 CNC machine.

(Click each name to add them directly to your show planner.
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JMI CNC & Automation is excited to announce a new partnership with AKKO Tooling Systems, a global leader in precision-engineered CNC toolholders and cutting tools. This partnership brings AKKO’s innovative and high-quality products to JMI’s customers, enhancing machining capabilities across industries with reliable, performance-driven solutions.

Founded in 1986, AKKO Tooling Systems has grown into a renowned manufacturer, delivering exceptional rotary toolholders, turning and milling toolholders, and a comprehensive range of precision inserts.

AKKO also sets itself apart with an extensive range of carbide grades tailored for different applications. While many tooling manufacturers limit themselves to a handful of carbide substrates, AKKO offers both high-performance grades and wear-resistant grades, allowing them to be more competitive and meet diverse machining needs.

Their advanced solutions include:

• Rotary Toolholders – Ensuring optimal balance and rigidity for high-precision drilling, reaming, and milling applications.
• Toolholders for Turning & Milling – Designed to minimize vibration and deliver superior surface finishes in turning and milling operations.
• Precision Inserts – AKKO offers a wide variety of inserts, including grooving, broaching, thread milling, whirling, valve seat inserts, and ISO inserts, delivering exceptional accuracy and performance for a variety of machining tasks.

“AKKO’s ability to provide a variety of carbide grades gives our customers the flexibility to optimize performance for specific applications, whether it’s high-speed, high-precision, or wear resistance,” said Kenneth Jones, President of JMI CNC & Automation.

“This unique advantage, combined with their exceptional product range, allows AKKO to stand out as a versatile and competitive solution for the modern machining industry.” continued Jones. 

For more information about AKKO Tooling Systems and the solutions now available through JMI CNC & Automation, visit our AKKO landing page or contact us for a on-site demonstration to test some tools!