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Three silver metal taps with fluted shafts and square ends

Greenfield Threading

Greenfield Threading HSS Tap Set M18 2.50 3pc Taper Plug Bottoming

SKU CH-ATB8-K3PDQ

Three-piece high-speed steel hand tap set cuts M18 × 2.50 metric threads in taper, plug and bottoming styles

  • Metric M18 × 2.50 threads cut cleanly with high-speed steel
  • Three-piece set covers taper, plug and bottoming operations
  • Four flutes on each tap improve chip clearance and threading speed
  • 1 13/16 in thread length handles deeper holes
  • 4 1/32 in overall length gives solid leverage for hand tapping

Greenfield HSS Tap Set M18 2.50

This three-piece set contains taper, plug and bottoming hand taps for cutting M18 metric threads with a 2.50 pitch. The high-speed steel tools are bright finished and uncoated for general-purpose threading work. They suit maintenance technicians and machinists who need to create or repair internal threads in steel and similar materials.

Thread limit D7 and class 6H fit

The taps are manufactured to a D7 thread limit and 6H class of fit for standard metric tolerance. Four flutes on each tap help evacuate chips during hand operation. Right-hand thread direction matches common fastener conventions. The bright finish requires cutting fluid to manage heat and tool wear during use.

Three tap styles for complete threads

The taper tap starts the thread with a gradual lead for easy alignment in a drilled hole. The plug tap follows to deepen the thread form with moderate chamfer. The bottoming tap finishes the thread close to the bottom of a blind hole with minimal chamfer. Using all three in sequence produces full-depth threads in through or blind holes.

How it compares

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

Price $111.99
Pricier than about 85% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

How do I start the M18×2.50 tap straight in the hole, and which tap should I use first?

Begin with the taper tap from the 3pc set; its gradual lead helps alignment. Use a tap wrench, keep it perpendicular, and advance with steady pressure while clearing chips every half turn.

When will the high-speed steel cutting edges need replacement on this M18×2.50 set?

Replace the taps when threads show tearing or the D7 limit no longer produces a 6H fit. HSS dulls faster in abrasive alloys; inspect flutes after each job and discard once sharpening cannot restore clean cutting.

What limits continuous threading with these 4-flute HSS taps before they overheat?

Heat builds quickly in deep M18 holes at 1 13/16 in thread length. Cutting speed, material hardness, and lack of lubricant all raise temperature; pause frequently and use ample cutting fluid to avoid temper loss.

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