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Cleveland spiral point tap plug, cobalt black oxide, three flutes

Cleveland

Cleveland C86209 Spiral Point Tap Plug 3 Flutes #8-36 UNF Cobalt Black Oxide

SKU CH-TJND-ZYGGE

Cuts #8-36 UNF threads with a three-flute cobalt spiral-point tap plug featuring black-oxide finish and a 53/64 in thread length

  • Spiral-point design clears chips forward for smoother tapping
  • Cobalt construction resists wear in tough materials
  • Black oxide finish reduces friction and adds corrosion protection
  • Three flutes balance strength and chip space
  • #8-36 UNF 2B class of fit for precise threads

Cleveland C86209 Spiral Point Tap

The Cleveland C86209 is a spiral point tap designed for creating internal UNF threads. It features a #8-36 thread size with a 2B class of fit and three flutes for efficient chip evacuation forward through the hole. The cobalt construction with black oxide finish provides wear resistance during threading operations. It measures 2 31/64 inches overall with a 53/64 inch thread length.

Suited for through-hole threading in metal

This tap suits machinists and maintenance technicians cutting #8-36 UNF threads in through-hole applications where forward chip ejection is preferred. The spiral point design pushes chips ahead of the cut, reducing flute clogging in ductile materials. It is not suited for blind-hole work where chips must be pulled upward, nor for left-hand thread requirements. Buyers needing different thread sizes, pitch standards, or flute counts should select alternative tooling.

75 percent thread drill size #29

The specified 75 percent thread drill size is #29, which determines the correct tap drill diameter for producing a Class 2B fit. Using this drill size ensures the proper minor diameter before tapping, directly affecting thread strength and gauge conformance. Selecting an incorrect drill size will result in threads that are too tight or too loose for the intended fastener. This single specification governs whether the tap produces compliant threads for the application.

How it compares

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

Price $13.99
Cheaper than about 80% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND

Questions about this item

How do I install the Cleveland C86209 tap and what drill size should I use?

Drill the hole with a #29 drill bit to achieve 75 percent thread engagement, then run the #8-36 UNF tap straight into the hole using a tap wrench; the spiral point pushes chips ahead so keep the tap aligned to avoid cross-threading.

When will the cobalt tap need replacement or resharpening?

The cobalt substrate with black oxide coating resists wear in steel and stainless; replace or resharpen when the cutting edges no longer produce clean threads or when thread gauge checks fall outside the 2B class of fit.

What is the first limitation I will hit during sustained tapping with this tool?

The 53/64 inch thread length and 3-flute spiral point design limit continuous thread depth; chip packing in deeper blind holes will stall the tap before the cobalt material wears out.

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