Product
The most-used holder in most tool cribs, and the one most often blamed unfairly. Supplied to your spindle interface, collet series and projection, with the runout-critical features ground.
Best for
Clamping straight-shank cutters, drills and reamers
You send
Spindle interface, collet series, tool diameter and projection
You get back
Holders and collets matched to the tools you run
How it starts
Compatibility confirmed before manufacture
The situation
Runout at the tool is cumulative, and the collet system is where several contributions quietly add up.
What you get
Collet holders and collets for milling, drilling and reaming on compatible machines.
The machine interface, tool interface and working envelope are checked before manufacture, so holders and collets arrive ready to run.
Supplied from range where a standard suits the job, made to order where it does not, or reproduced from your sample where the original is unavailable.
Locating and clamping features are ground and the dimensions governing runout and repeatability are inspected before dispatch.
Repeat orders and modifications are handled in Bengaluru rather than through an import cycle.
ER collet holders clamp straight-shank tools by compressing a slotted collet inside a tapered nose. They are the general-purpose holder on machining centres and are also used on lathes and drilling machines. CMTA supplies holders and collets across the common ER series.
Holders with BT, ISO, CAT and straight-shank or Morse taper interfaces, in standard and extended projections, across the ER series. Collets in metric and inch ranges. The verified size table follows CMTA's confirmation.
Match the spindle interface and pull stud, choose the collet series from the largest shank you need to hold, and select the projection from the depth of the feature and clearance to the fixture — in that order. Working backwards from projection is how shops end up with a holder that reaches but will not cut.
Holder bodies are hardened and ground on the taper and collet seat; collets are ground for concentricity. Runout is checked on the finished holder.
Before you enquire
The inputs that make a useful review, plus the related pages worth reading first.
FAQ
The questions engineers and buyers ask before sending a drawing. If yours is not here, ask it directly — you will get an engineer's answer, not a brochure.
Still have a question?
Talk to Anita M.N, Managing Partner, or send the drawing and let the review answer it.
Spindle taper or interface (BT, ISO, CAT, HSK, Morse, straight), Collet series (ER11 to ER50), Tool shank diameter range, Projection or gauge length, Runout requirement. If you are unsure of any of these, send a photograph of the current holder and the machine nameplate — that is usually enough for us to confirm the rest.
Yes. Variations in length, reach, interface, clamping or tool size are manufactured to order. Fully custom variants go through the custom tool holder process, with a drawing approved by you before manufacture.
Against three things: the machine interface, the tool interface and the working envelope. Where an existing item is being replaced, matching it to your sample or original part number is the most reliable route of all.
Yes. A drawing is manufactured to its stated tolerances; a sample is measured and reverse engineered into a drawing for your approval, and then manufactured.
Start a project
Share what you are trying to make or fix. Our engineering team reviews every enquiry and responds with the questions that matter, a feasibility view and next steps.
