Omega R8 ER Collet Chucks – ER16, ER25, ER32 & ER40

Use standard ER collets to hold different tool shank diameters while keeping the same chuck fitted to your R8 milling machine. Omega R8 ER collet chucks are available in ER16, ER25, ER32 and ER40 versions, with a 7/16″ UNF drawbar thread for compatible Bridgeport-type spindles.

Give your R8 milling machine the flexibility of standard ER collets with an Omega R8 ER Collet Chuck. Designed for compatible Bridgeport-type spindles with a 7/16″ UNF drawbar, this holder lets you clamp different straight-shank tools by changing the matching ER collet.

• Change tool diameters within one holder: Select the correct collet for each tool shank while retaining the R8 chuck in the spindle, making it practical for jobs using several cutter sizes.
• Match your existing ER tooling: Choose ER16, ER25, ER32 or ER40 to use the corresponding collet series already in your workshop or build a setup around your required tool sizes.
• Fit the correct spindle connection: The R8 taper and 7/16″ UNF drawbar thread provide a defined mounting arrangement for compatible milling machines.
• Choose documented balance quality: Omega specifies G6.3 at 12,000 rpm, providing a stated balance grade for the holder.

Select your required ER collet series to order, or send PMI your spindle type, drawbar thread and tool shank sizes for help choosing the correct chuck.

Specification	Details
Brand	Omega
Product type	R8 ER collet chuck
Machine interface	R8 taper — Bridgeport type
Drawbar thread	7/16″ UNF
Collet system	Standard ER
Available collet series	ER16, ER25, ER32 and ER40
Stated balance specification	G6.3 at 12,000 rpm
Tool clamping	Through a matching ER collet selected for the tool shank diameter

 

Name	Collet	Omega part number / variant SKU
R8 ER16 Collet Chuck	ER16	OM31314
R8 ER25 Collet Chuck	ER25	OM31449
R8 ER32 Collet Chuck	ER32	OM31315
R8 ER40 Collet Chuck	ER40	OM31316

Compatibility, installation requirements and what is included

• Machine compatibility: For Bridgeport and other milling machines fitted with an R8 spindle and a compatible 7/16″ UNF drawbar.
• Collet selection: Match the ER collet series to the chuck, then select the correct clamping size for the tool shank. For example, the ER32 version requires an ER32 collet.
• Installation: Clean the spindle taper, chuck and collet seating surfaces before assembly. Use a suitable tightening spanner and follow the machine and clamping-system instructions.
• Operating speed: G6.3 at 12,000 rpm is the stated balance specification. Operating speed must remain within the limits of the machine, holder, collet and cutting tool.
• Product supplied: One Omega R8 ER collet chuck in the selected size. A matching ER collet and suitable tightening spanner are required for use.