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Cleveland spiral point tap plug, #4-48 UNF, cobalt, 3 flutes

Cleveland

Cleveland Spiral Point Tap Plug 3 Flutes #4-48 UNF

SKU CH-RZHY-MBBS7

A cobalt spiral-point tap cuts #4-48 UNF threads with three flutes and a 43/64 in thread length

  • Spiral point design pushes chips ahead for smoother threading
  • Cobalt construction with Hard Lube coating extends tool life in tough materials
  • Three-flute geometry balances strength and chip clearance for reliable cuts
  • #4-48 UNF thread with 2B class of fit ensures precise fastener engagement
  • Overall length 2 13/64 in and thread length 43/64 in suit standard tapping depths

Spiral Point Tap #4-48 UNF

The Cleveland C96004 spiral point tap cuts #4-48 UNF threads in through holes. Three flutes and a right-hand spiral point push chips forward, reducing clogging in production runs. Cobalt construction with Hard Lube coating resists wear in steel and stainless alloys. Designed for machinists and maintenance technicians who need consistent thread quality.

Practical limits of UNF #4-48 tapping

The 2B class of fit and 75 percent thread engagement require a 2.32 mm drill for proper clearance. Thread length is 43/64 in within an overall length of 2 13/64 in, limiting reach in deep holes. Cobalt substrate handles higher cutting temperatures than high-speed steel but remains brittle under shock loads. Spiral point geometry is unsuitable for blind holes where chips cannot escape forward.

Check your setup before ordering

Verify the workpiece material matches cobalt cutting parameters and that your holder accommodates the tap shank. Confirm the #4-48 UNF specification matches the drawing, as fine-pitch threads are not interchangeable with coarse series. Ensure the drilled hole diameter is 2.32 mm for 75 percent thread height. Blind-hole applications need a bottoming or plug tap with a different flute design.

How it compares

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

Price $20.99
Cheaper than about 62% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND

Questions about this item

Is the #4-48 UNF size the right choice for the 2.32 mm drill and 75 percent thread engagement?

Yes, the #4-48 UNF tap is designed for a 2.32 mm drill size to achieve 75 percent thread engagement with a 2B class of fit.

What does the 43/64 inch thread length mean when I am tapping a blind hole?

The 43/64 inch thread length is the cutting portion; the spiral point pushes chips ahead so the tap can cut to that depth in a through hole.

How does the UNF thread standard affect the fit with a mating fastener?

The UNF fine-pitch standard combined with a 2B class of fit provides a tighter, more precise fit than coarse threads for vibration resistance.

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