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Silver cylindrical drill bit with stepped cutting edges and smooth shank, shown against a plain background

PrimoChill

PrimoChill RFB Rigid Finishing Bit 1/2in ID x 5/8in OD

SKU CH-7MWE-PYHY9

Drill-mounted finishing bit reams, deburrs and trims 1/2 in. ID × 5/8 in. OD rigid tubing for clean, precise watercooling joints

  • TypeCPU Block

Option 1/2in. ID X 5/8 in. OD

  • Achieve flawless tube ends with the RFB Rigid Finishing Bit for reaming, deburring, and trimming
  • Save time and energy using a standard drill bit instead of hand-cranking a plastic reamer
  • Adjust RPM to smooth tube ends or trim rigid tubing to a precise custom length
  • Sealed bearings provide scuff-free spinning for a clean, professional finish on every cut
  • Compatible with 1/2 in. ID x 5/8 in. OD PETG and PMMA rigid tubing

Tool for Rigid Tubing

The PrimoChill RFB Rigid Finishing Bit is a drill-bit accessory built for custom watercooling loops. It reams, deburrs and trims 1/2in ID x 5/8in OD hardline tubing in a single step. The tool fits standard drill chucks and uses sealed bearings to spin without scuffing the tube surface. It targets builders who want clean, professional tube ends without hand-reaming.

Capacity and Headroom

The bit is sized for 1/2in inner-diameter tubing with a 5/8in outer diameter, covering common PETG and PMMA rigid tube. It removes material quickly at higher RPM for length trimming, then smooths the cut at mid-to-low RPM for a flush finish. Copper tubing is not recommended because the metal dulls the cutting edges extremely fast. Results depend on the tubing’s own dimensional tolerances.

Practical Limits

The tool requires a standard drill and operator practice on scrap tube to judge material-removal speed. Finished quality varies with tubing precision; looser tolerances produce less consistent ends. No cutting fluid or lubrication system is integrated, so heat buildup at high RPM must be managed by the user. The bit does not support tubing sizes outside the stated 1/2in ID x 5/8in OD specification.

Highlights

  • Achieve flawless tube ends with the RFB Rigid Finishing Bit for reaming, deburring, and trimming
  • Save time and energy using a standard drill bit instead of hand-cranking a plastic reamer
  • Adjust RPM to smooth tube ends or trim rigid tubing to a precise custom length
  • Sealed bearings provide scuff-free spinning for a clean, professional finish on every cut
  • Compatible with 1/2 in. ID x 5/8 in. OD PETG and PMMA rigid tubing

Specifications

TypeCPU Block

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Questions about this item

Will this bit work with the 1/2 in. ID x 5/8 in. OD PETG tubing I already have?

Yes, the PrimoChill RFB is sized for 1/2 in. ID x 5/8 in. OD rigid tubing and is recommended for PETG and PMMA; copper tubing is not recommended because it dulls the bit very quickly.

How can I verify the bit is cutting correctly once I put it in my drill?

Run the drill at mid to low RPM; the sealed bearings should spin without scuffing and the bit will smooth the tube end cleanly. Increase RPM only when you want to trim the tube to final length.

Does the package include any extra collets, guides or lubricant, or just the bit itself?

The box contains one assembled Rigid Finishing Bit only; no additional collets, guides or lubricant are supplied.

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