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Spiral point tap, bright high-speed steel, three flutes, right-hand threads

Greenfield Threading

Greenfield Threading 357819 Spiral Point Tap 1/2-13 UNC 3 Flutes

SKU CH-25WZ-QR5WM

A 1/2-13 UNC spiral-point tap with three flutes, 3 3/8 in overall length and H2 thread limit for 2B class fit

  • Spiral point design pushes chips forward for cleaner through-holes
  • High-speed steel construction resists wear during repetitive tapping tasks
  • Bright uncoated finish suits general-purpose threading in steel and cast iron
  • Three flutes balance chip clearance with cutting strength
  • 1/2-13 UNC thread size matches standard coarse-pitch fastener requirements

Thread Size and Pitch

The Greenfield Threading 357819 Spiral Point Tap cuts 1/2-13 UNC threads in a right-hand direction. It suits maintenance and production teams that need through-hole tapping in steel or aluminium.

Hole Diameter and Thread Limit

Verify the drilled hole matches the 75 percent thread drill size of 0.4219 in before starting. The H2 thread limit and 2B class of fit determine the final tolerance, so confirm the drawing calls for that allowance.

Flute Count and Coating

Three straight flutes push chips ahead of the tap to reduce binding in through holes. The bright uncoated high-speed steel surface works with standard cutting fluids and avoids coating wear in abrasive materials.

How it compares

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

Price $15.99
Cheaper than about 73% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

What comes in the box with the Greenfield Threading 357819 tap and do I need to buy a drill bit separately?

The box contains the spiral point tap only; a 0.4219 inch drill bit for the 75 percent thread is not included and must be purchased separately.

Should I choose this H2 limit tap or a different thread limit for a standard 1/2-13 UNC hole?

The H2 limit matches a class 2B fit, which is the standard choice for general-purpose 1/2-13 UNC threading.

What does the 3 3/8 inch overall length mean when the tap is in my drill press or tapping head?

The 3 3/8 inch overall length gives enough reach for through-holes up to about 1 21/32 inch deep while keeping the shank securely clamped.

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