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Mega ER Grip: High Quaility Tool Holders

Mega ER Grip

Introducing the Mega ER Grip! The total precision of our collet, nut, and body shatter the common standard of ER collet chucks. BIG's Mega ER Grip is a high quality ER collet chuck that completely satisfies the 4 requirements for tool holders; clamping force, concentricity, rigidity, and balance for high spindle speeds.

Each part of the assembly puts together our high precision production technology and our design creativity for collets, clamping nuts and chuck bodies. When an inexpensive tool holder is selected based on a small cost saving, a waste in valuable time and money during production results in higher costs in the long term.


A product of:

MEGA ER grip Flv

Mega ER Grip Tools

Features of the Mega ER Grip

  • Available in BIG-PLUS® CAT/BBT30, HSK, and BIG CAPTO
  • Clamping range ø.075"-ø.787"
  • All collets inspected twice to guarantee runout accuracy
  • High precision nut with built-in thrust ball bearings
  • High rigidity body that increases the contact area of the collet
  • High precision pre-balanced body
  • Tool life extended 3x compared to conventional ER systems
  • Precise coolant supply to the cutting edge

BIG-PLUS® Mega ER Grip Holders
CAT BCV40 Shan CAT BCV50 Shank CAT BBT30 Shank

CAT BCV40 Shank
Max 35,000 RPM

CAT BCV50 Shank
Max 20,000 RPM

BBT30 Shank
Max 40,000 RPM

Clamping Range Dia.: .075" - .787"
Gauge Length: 3"-6"

Clamping Range Dia.: .075"-.787"
Gauge Length: 3.5"-6"

Clamping Range Dia.: .075"-.787"
Gauge Length: 2.362"

The ERC collet with the best runout accuracy in the world

All collets are inspected twice in order to guarantee
the runout accuracy, which has a great influence on tool life.

ER Collet
ER Grip Collet ER Grip Runout

ERC Collet:

Clamping range: ø.075" - ø.787"
Collet class: AA
Runout: 1 µm at nose

High rigidity body that increases
the contact area of the collet
ER Grip Contact

By increasing the contact length of the internal taper of chuck bodies, the undesired overhang of the collet is reduced. This modification of the standard improves 3 of the most important requirements for the collet chuck (rigidity, runout accuracy, clamping force). (Conventional DIN collets can also be used.)

ER GRIP Clamping

High precision pre-balanced body

The unbalance of the drive keys in the steep taper and HSK tool shanks is reduced to a minimum by a pre-balancing operation. (BIG CAPTO tool shanks are also pre-balanced) The tool shanks also include tapped holes around the periphery so that precision balancing can be performed with balancing screws.

Balancing Screws

Mega ER Perfect Seal/Jet
Perfect Seal Perfect Jet
Mega Perfect Seal Perfect Seal Perfect Jet

Sealed Collet Nut for Coolant Through Tools

Nut for coolant Deliivery Around Cutter Shank Periphery

Mega ER Solid Nut

High performance solid nut with surface treatment for friction reduction. Slot-free outer diameter increases rigidity of the nut itself. The one-way clutch of the Mega Wrench tightens the nut securely and easily by ratchet function.

Mega Perfect Seal

Simplification of the nut tightening operation with the Mega Wrench

The one-way clutch of the Mega Wrench tightens the nut firmly and securely by applying even torque to the outside periphery of nut.
The ratchet function greatly helps to simplify and speed up the tightening operation of the nut and prevents injury to the hands of the operator.

Mega Wrench tightening