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Cleveland C86227 spiral point tap, cobalt, black oxide finish, three flutes

Cleveland

Cleveland C86227 Spiral Point Tap 5/8-18 UNF Cobalt 3 Flutes

SKU CH-2HGW-EVE73

Cobalt spiral-point tap cuts 5/8-18 UNF threads with three flutes and black-oxide finish

  • Thread cutting in hardened steels with cobalt construction
  • Clean chip ejection forward thanks to spiral point design
  • Precise UNF threads to 2B class of fit
  • Three flutes balance strength and cutting speed
  • Black oxide finish resists wear and galling

Cleveland Spiral Point Tap 5/8-18 UNF

This Cleveland spiral-point tap cuts 5/8-18 UNF threads in through-holes and is aimed at machinists and maintenance technicians who need a cobalt tool for stainless steel or high-strength alloys. The 3-flute geometry pushes chips ahead of the cut to reduce binding in production runs.

Installation notes and common issues

The plug-chamfer design starts easily in a pre-drilled 14.50 mm hole, and the black-oxide finish helps retain cutting fluid during the 2 3/32 in thread length. Breakage usually occurs when the tap is forced without adequate lubrication or when the workpiece material exceeds the cobalt grade's hardness range.

Thread specification that decides fit

The tap is ground to a 2B class of fit with a 75 percent thread depth, so it produces standard Unified National Fine threads that meet the 2B tolerance window. Parts requiring a tighter 3B fit or a different pitch diameter will not gauge correctly with this tool.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $46.99
Pricier than about 65% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND

Questions about this item

How can I verify the tap is cutting correctly after setup?

Check that threads measure to the 2B class of fit and that chips are pushed forward by the spiral point design.

What comes with the C86227 tap and what must I supply?

The box contains the cobalt spiral point tap only; you must provide a 14.50 mm drill bit and a tap wrench or holder.

Which version of this tap should I choose for a standard UNF hole?

Select the 5/8-18 UNF model with 3 flutes, 2B thread limit and 75 percent thread drill size for general-purpose threading.

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