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Cleveland C55028 straight flute hand tap, bright high-speed steel finish, plug style, four flutes

Cleveland

Cleveland C55028 Straight Flute Hand Tap 1-3/8"-6 UNC Plug 4 Flutes

SKU CH-Q6TB-BC9CW

Creates UNC internal threads in a 1-3/8"-6 size with a four-flute plug design for through-hole tapping

  • TypeTaps
  • Straight-flute design starts threads cleanly in through-holes
  • Plug chamfer engages quickly for efficient hand tapping
  • Four flutes evacuate chips smoothly during operation
  • High-speed steel construction resists wear in general-purpose use
  • Bright uncoated finish suits a wide range of materials

Cleveland C55028 Straight Flute Hand Tap

The Cleveland C55028 is a straight flute hand tap designed to cut unified national coarse threads in a single pass. It suits machinists and maintenance technicians who need to create new internal threads or repair damaged ones in steel, cast iron and non-ferrous metals. The H4 thread limit targets a 2B class of fit for standard industrial assemblies. This tool is not for buyers who need a spiral point or spiral flute tap for efficient chip evacuation in deep blind holes.

Thermals noise and power draw in normal use

As a non-powered cutting tool the tap generates no operational noise or electrical power draw. Heat is produced only at the cutting interface during manual or machine tapping and is managed through cutting fluid and appropriate speed selection. The bright uncoated high speed steel body relies on lubrication rather than surface treatments to control friction. This tool is not for operators who require a coated tap for dry machining or extended tool life in abrasive alloys.

Behaviour under sustained load

The four flute design distributes cutting forces evenly across the 3 inch thread length during continuous threading operations. High speed steel construction maintains hardness at the temperatures encountered in prolonged hand or low speed machine tapping. The plug chamfer provides a balanced start for both through holes and blind holes with adequate clearance. This tool is not for high volume production runs where carbide or coated tooling would reduce changeover frequency.

Highlights

  • Straight-flute design starts threads cleanly in through-holes
  • Plug chamfer engages quickly for efficient hand tapping
  • Four flutes evacuate chips smoothly during operation
  • High-speed steel construction resists wear in general-purpose use
  • Bright uncoated finish suits a wide range of materials

Specifications

BrandCLEVELAND
TypeTaps

Questions about this item

How do I install the Cleveland C55028 straight flute hand tap and what step is often missed?

Drill the hole to the 75 percent thread drill size of 1.2126 in, then run the tap with a suitable wrench; the step often missed is using cutting fluid to prevent binding.

What maintenance or replacement will the Cleveland C55028 tap need later?

The high-speed steel cutting edges dull over time; replace the tap when threads become oversized or the flutes no longer clear chips cleanly.

What limit appears first on the Cleveland C55028 tap under sustained use?

The H4 thread limit and 2B class of fit mean the tap will reach its pitch-diameter tolerance before the tool body wears out.

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