Name: R8 Collets
Brand: FuRui Tooling

Product description

R8 collets hold a selected tool shank directly in an R8 milling spindle. This series is organized around bore size and the catalog's metric or inch selections, rather than an ER nut size. Use the existing spindle and drawbar details to confirm the replacement before choosing an individual collet or an assortment.

Direct R8 connection

Match the machine's R8 spindle and drawbar arrangement; this is not an ER collet.

Bore-based selection

Order by actual tool shank diameter and measurement system, not cutter diameter.

Replacement matching

Send the existing collet code or drawing when replacing a worn or missing size.

R8 collet sizes: keep inch and metric bores separate

Read the tool’s shank marking before choosing a bore. For an inch-marked shank, keep that inch size in the inquiry; the exact conversion below helps check the dimension without rounding it to a different metric size.

Selected inch shank sizes — exact unit conversions, not a stock list
Tool-shank marking	Exact diameter in mm
1/8 in	3.175 mm
1/4 in	6.35 mm
3/8 in	9.525 mm
1/2 in	12.7 mm
5/8 in	15.875 mm
3/4 in	19.05 mm

A 1/2 in shank needs a matching 1/2 in bore selection, not a rounded 12 mm or 13 mm size. These conversions use 1 in = 25.4 mm. They do not specify a clamping tolerance, collapse range or available assortment. Confirm the offered bore and drawbar connection for the selected R8 collet.

For a mixed-unit order, list the sizes separately: for example, “10 mm: 2 pieces; 1/2 in: 2 pieces.” Add the machine model and drawbar details to the fillable R8 bore-schedule worksheet.

Specify individual bores for an R8 collet set

A request for an “R8 collet set” does not define the sizes included. Prepare a bore schedule with:

Each actual tool-shank diameter, with mm or inch units.
The quantity of each bore, not just the total number of collets.
The machine model, drawbar details and an existing collet marking or drawing.

For example: “Round hole collet; requested bore 10 mm; quantity 5; confirm the drawbar connection against the attached machine details.” This is an inquiry example, not a stock or assortment claim.

Request R8 collets with your bore list. The link selects the catalog family; add your size schedule before sending.

Direct R8 spindle collets or an ER holder assembly?

This page covers collets that fit directly into an R8 spindle. If the setup uses an R8 holder with a separate ER nut and collets, specify that assembly instead.

Compare R8 ER collet holders and ER collet bores. For the connection-by-connection comparison, read the ER vs R8 collet selection guide.

Download the R8 collet bore-schedule worksheet (fillable PDF, 2 pages)
Record the machine and drawbar details, then enter each metric or inch bore and its quantity. Select direct R8 collets or an R8 ER holder explicitly so the quotation covers the correct component.

Specifications & model range

Metric and inch entries are separate bore schedules. The ranges describe the family, not one collet's capacity or a guaranteed set of increments. Specify each required bore and unit; confirm the offered sizes and final drawing before ordering.

Clamping format: Round hole and spare collet
Range: 2-20 mm or 1/16-1 in
Catalog weight: 0.24 kg

This table lists R8 collet types and catalog ranges, not each bore size. Send individual metric or inch bore sizes and quantities with your inquiry.

Select an underlined catalog reference to include that row in your inquiry.

R8 Collets catalog specifications
Type	Clamping range	Weight
Round hole collet	2-20 mm / 1/16-1 in	0.24 kg
Spare collet	1.5 mm / 1/16 in	0.24 kg

Ranges and slash-separated values describe catalog families, not every possible combination. Confirm the complete model and drawing before ordering.

Application scenarios

Typical selection contexts for this series, not customer project claims. Confirm machine compatibility and cutting conditions for your setup.

Tool-room milling

Clamping individual shank sizes on a confirmed R8 milling spindle.

Maintenance replacements

Replacing a particular collet in an existing machine's tooling assortment.

Mixed-unit tooling

Planning separate metric and inch bores for a mixed tool inventory.

Inspection & order review

Specify the dimensions, tolerances and records your order requires. Acceptance criteria must be agreed for the selected model.

Catalog fields to check

Type
Clamping range
Weight

Check the drawing reference faces and units. A catalog size alone does not define a tolerance or an inspection method.

Records to request

List any required dimensional report, material document or model identification photograph in your inquiry. Confirm availability and scope in the quotation.

For a drawing-based part, include the drawing revision and identify the critical dimensions. Website photographs are not inspection reports.

Packaging & delivery

Agree the packing method and photo requirements when confirming your order.

Order-specific photo confirmation

No verified shipment photographs for this series are currently published. Include selected-model, protective-packing and outer-label photos in your order requirements.

Discuss packing requirements

Photos to confirm before dispatch

Use this checklist to agree what should be documented for your selected model.

Bore marking visible beside each collet
Taper and slots protected from contact damage
Assortment count checked against the bore list

Stock, dispatch date and shipping method are confirmed with the quotation. Website images are not live inventory evidence.

Technical resources

Product specifications

Keep a copy of the current series information for comparison. Confirm the final model and drawing before placing an order.

View specifications

Compare collet families

Distinguish ER, R8, C-type and SK connections before choosing a bore.

Read the guide

Related selection information

Browse the existing tooling guides and compare product families before selecting a model.

Browse technical resources

Compare alternative interfaces and complementary tooling. A related series is not automatically interchangeable.

View the full category

Product FAQ

Selection questions for R8 Collets.

Request a quote

Is an R8 collet the same as an ER collet?

No. This series connects to an R8 spindle. ER collets require a matching ER holder and nut.

Does one R8 collet cover the entire 2–20 mm range?

No. The round-hole row lists family coverage of 2–20 mm and 1/16–1 in, not the capacity of one collet. Specify a separate bore for each actual tool-shank diameter. The cutter's cutting diameter may be different from the shank that the collet holds.

Are the metric and inch range endpoints equivalent?

No. The table presents two bore schedules, not an exact unit conversion: 1 in equals 25.4 mm, while the listed metric range ends at 20 mm. Keep the required bore and its unit together in the order. The family ranges do not establish every available increment, assortment content or stock status.

Which R8 collet dimensions should I confirm for a replacement?

Confirm the requested tool bore and its unit, overall collet length, body diameters and the complete drawbar thread, including pitch. Send the machine model, existing collet marking and clear photographs or a dimensioned drawing. The bore ranges in this page’s table are not a complete body drawing. Ask for the selected collet’s drawing before approving the replacement.

R8 Collets

Overview