Omega R8 Collets for Bridgeport Milling Machines – 2–20 mm

Clamp metric tool shanks directly in your R8 spindle with Omega R8 Collets. Available individually in 19 sizes from 2 mm to 20 mm, these collets provide a compact toolholding arrangement for compatible milling machines with a 7/16″ UNF drawbar.

Hold metric straight-shank tooling directly in your milling machine’s spindle with Omega R8 Collets. Available in 19 individual sizes from 2 mm to 20 mm, this range lets you select the correct collet for each tool shank and build a useful selection for everyday milling and drilling.

• Keep the tooling arrangement compact: Each collet fits directly into the R8 spindle taper, helping preserve working clearance around the cutter and workpiece.
• Match the tool shank: Individual metric clamping sizes in 1 mm steps give you clear size selection for cutters, drills and reamers with matching straight shanks.
• Use the machine’s drawbar: A 7/16″ UNF thread allows retention by a compatible drawbar, with tool grip created as the collet is drawn into the spindle taper.
• Buy the sizes you need: Collets are available individually, so you can replace an existing size or add particular bore sizes to your workshop tooling.

Specification	Details
Brand	Omega
Product type	R8 collet
Spindle interface	R8 — Bridgeport type
Mounting arrangement	Directly into the machine’s R8 spindle taper
Drawbar thread	7/16″ UNF
Nominal clamping sizes	2–20 mm
Size increments	1 mm
Number of available sizes	19
Tool shank type	Straight, cylindrical shank matching the selected nominal clamping size
Sale quantity	One collet in the selected size

Variant name	Diameter	Omega part number / variant SKU
R8 2 mm Collet	2 mm	OM31295
R8 3 mm Collet	3 mm	OM31296
R8 4 mm Collet	4 mm	OM31297
R8 5 mm Collet	5 mm	OM31298
R8 6 mm Collet	6 mm	OM31299
R8 7 mm Collet	7 mm	OM31300
R8 8 mm Collet	8 mm	OM31301
R8 9 mm Collet	9 mm	OM31302
R8 10 mm Collet	10 mm	OM31303
R8 11 mm Collet	11 mm	OM31304
R8 12 mm Collet	12 mm	OM31305
R8 13 mm Collet	13 mm	OM31306
R8 14 mm Collet	14 mm	OM31307
R8 15 mm Collet	15 mm	OM31308
R8 16 mm Collet	16 mm	OM31309
R8 17 mm Collet	17 mm	OM31310
R8 18 mm Collet	18 mm	OM31311
R8 19 mm Collet	19 mm	OM31312
R8 20 mm Collet	20 mm	OM31313

• Machine compatibility: Suitable for Bridgeport and other milling machines fitted with an R8 spindle and a compatible 7/16″ UNF drawbar.
• Size selection: Match the collet’s nominal clamping size to the tool’s shank diameter. The shank diameter may differ from the tool’s cutting diameter.
• Installation: Clean the spindle taper, collet and tool shank before fitting. Seat the collet correctly and secure it using the drawbar according to the machine manufacturer’s instructions.
• Tool engagement: Position the tool so the collet grips its cylindrical shank, keeping the cutting flutes clear of the clamping area.
• Included: One Omega R8 collet in the selected size, for use with the machine’s compatible drawbar and your chosen cutting tool.