BIG DAISHOWA—Americas

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CNC Tool Holders

CNC tool holders are the interface between the machine spindle and the cutting tool. BIG DAISHOWA offers a wide variety of shanks common to the market, including both BIG-PLUS and standard versions of DV(DIN69871), BT(JIS B6339), and CAT(ASME B5.50) steep tapers as well as HSK (ISO12164) hollow shank tapers and BIG CAPTO (ISO26623-1) polygon taper shanks.

We offer a wide range of tool holder technologies for the highest possible performance in specific types of applications. Including collet chucks, mechanical milling chucks, hydraulic chucks, shrink fit holders, side lock end mill holders, shell mill adapters, and tapping chucks.

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HSK Tooling System

How Different Holders Stack Up

Balancing According to ISO 16084

High Performance Tool Holders Built to Boost the Bottom Line

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Read the Frequently Asked Questions

Collet Chucks

BIG-PLUS® BT MEGA New Baby Chuck

BIG DAISHOWA’s CNC collet chucks have a guaranteed runout at the collet nose of less than 0.003 mm at 4xD, and are available for all machine tool spindles.

CNC Milling Chucks

BBT HMC

BIG DAISHOWA mechanical CNC milling chucks offer the highest gripping strength, improved rigidity, and coolant delivery for improved tool life.

Hydraulic Chucks

BIG-PLUS® BT Hydraulic Chuck

Hydraulic Chucks are ideal tool holders for machining processes that require high accuracy such as drills, reamers, ball mills, end mills, diamond reamers and grinding tools.

CNC Tapping Holders

MEGA Synchro Tapping Holder

Upgrade your CNC tapping operations with the MEGA Synchro Tap Holders. Improves thread quality & tap life by reducing thrust loads by up to 90%.

Basic Arbors

BIG-PLUS® BT End Mill Holder

BIG DAISHOWA offers basic arbors for Shell Mills and Face Mills, Shrink Fit, and Side Lock End Mill tool holders for conventional cutting tools.

Coolant Inducers

BIG-PLUS® BT Hi-Jet Holder Coolant Inducer

Coolant Inducers introduce coolant capabilities to machine tools without coolant-through spindles. Learn more about these unique tools.

Frequently Asked Questions

What are the benefits of BIG-PLUS products?

BIG-PLUS holders’ superior rigidity provides many machining benefits:

Better surface finish and dimensional accuracy
Longer tool life
Prevention of fretting corrosion caused by heavy cutting
Improved automatic tool changer (ATC) repeatability
Elimination of Z-axial movement at high speeds

Keep an eye out for unlicensed, dual-contact tooling that is not BIG-PLUS. They will not perform as well as licensed BIG-PLUS tooling. The licensed system, developed by BIG DAISHOWA, allows holders to contact both the spindle taper and the spindle face flush, simultaneously.

How do you choose the right tool holder?

Choosing the right tool holder depends on a wide array of variables. For instance, if high-speed machining is the job, balance may be a priority in selection. If a long tool is called for, vibration control might be at the top of the list. If controlling carbide costs or extending tool life is important to a job, there are different ways to approach choosing tools.

There's rarely a one-size-fits-all solution. Consult your supplier to discuss the best holder for your situation.

What is an HSK tool holder and what is different about HSK tool holders?

Where BIG-PLUS uses the taper and flange contact, HSK—hohl shaft kegel (HSK) in German—works by elastically deforming the tool holder. Fingers inside the hollow shank of the tool holder clamp the holder by pushing out. High spindle speed and centrifugal force actually strengthen HSK clamping.

As speeds and feeds have increased over the years, the shallower 1-to-10 taper ratio of the German hollow taper shank has proven effective.

We offer one of the largest selections of HSK holders in the world.

Do I need to balance BIG DAISHOWA tool holders?

In most cases, users can skip balancing operations with holders from BIG DAISHOWA. Our holders are designed and built with extreme runout accuracy and control. As a result, when assembled properly, everything—cutting tools, collet nuts and pullstuds included—will spin on the same centerline as the spindle.

Side-lock holders are the exception. By design, they do not spin on a true centerline and must be balanced after assembly.

How do I choose the right pullstud or retention knob for my machine?

Most manufacturers specify a standard, such as ASME, JIS, MAS, ISO or DIN. However, they may also include some additional sealing features that are not specified in the standard and are unique to their equipment.

Consult your user manual for machine clamping knob specifications and requirements. BIG DAISHOWA pullstuds are specified not only by standard but also OEM where applicable.