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Cleveland 55142 straight flute hand tap 5/8"-18 plug HSS TiN coated

Cleveland

Cleveland 55142 Straight Flute Hand Tap 5/8"-18 Plug

SKU CH-MRZN-55ZPB

Cuts 5/8"-18 UNF threads with a 1.81 inch thread length and 3.81 inch overall length in high-speed steel

  • Product typeTaps
  • Cuts clean 5/8"-18 UNF threads with straight-flute design
  • High-speed steel body with TiN coating resists wear
  • Plug chamfer starts threads easily in through-holes
  • 81 in overall length reaches deep holes
  • H3 limit produces Class 2B fit for standard assemblies

Thread-cutting tap for UNF 5/8"-18 holes

This Cleveland straight-flute hand tap cuts 5/8"-18 UNF internal threads in through-holes or blind holes. The plug chamfer starts easily and clears chips forward. It is sized for a 75-per-cent thread engagement using a 14.50 mm drill. Right-hand cutting suits conventional tapping direction.

High-speed steel body with TiN coating

The HSS substrate resists wear in steel and non-ferrous workpieces while the titanium-nitride finish reduces friction and extends tool life. A 3.81 in overall length and 1.81 in thread length reach typical hole depths without excessive overhang. Class 2B fit and H3 limit meet standard thread-gauge requirements.

Steady cutting under sustained hand

Straight flutes hold a consistent chip load so the tap does not grab or chatter during prolonged threading passes. TiN coating maintains lubricity when heat builds up over multiple holes. The plug lead keeps alignment true from start to finish without the aggressive bite of a taper tap.

How it compares

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

Price $37.99
Pricier than about 60% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCLEVELAND
Product typeTaps

Questions about this item

Will the H3 thread limit still hold tolerance after repeated passes in stainless?

The H3 limit and 2B class of fit are ground into the high-speed steel body; they do not change with use.

Does the TiN coating reduce cutting heat enough for dry tapping all day?

TiN lowers friction but the tap has no internal coolant passages, so heat still builds in continuous dry cuts.

What size drill bit must I already have to prepare the hole?

A 14.50 mm drill produces the 75 percent thread depth this tap requires.

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