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Gold-coloured spiral point tap with two straight flutes and a plug chamfer

Westward

Westward Spiral Point Tap 5/16"-18 UNC Plug 2 Flutes TiN H3

SKU CH-D3HP-1APQ1

Cuts 5/16"-18 UNC threads in through-holes with a TiN-coated high-speed steel plug tap

  • TypeHole, Drill, Bore & Wire Gauges
  • 5/16"-18 UNC thread fits standard coarse holes
  • Spiral point pushes chips forward for through-hole work
  • TiN coating reduces wear on high-speed steel
  • Two-flute design clears swarf efficiently
  • H3 limit meets Class 3B fit tolerance

Spiral Point Tap 5/16"-18 UNC

This Westward spiral point tap cuts 5/16"-18 UNC threads in a right-hand direction. It is made from high speed steel with a TiN coating for wear resistance. The H3 thread limit and Class 3B fit suit general-purpose threading work. Two flutes push chips ahead of the cut in through-holes.

Upgrade from dull or uncoated taps

A worn tap produces oversize or rough threads that weaken fasteners. The TiN coating on this tool reduces friction and extends edge life in steel and alloy. The jump is worth it when thread quality must stay consistent across multiple holes. It replaces taps that have lost their lead or show chipping on the flutes.

Capacity and headroom for through-hole threading

The 1 1/8 in thread length handles typical through-hole depths in plate and bracket work. Overall length of 2 23/32 in gives enough reach for standard tap wrenches. Two flutes limit chip capacity in deep or blind holes, so this tap is not for bottoming operations. It runs out when hole depth exceeds the thread length or when chip evacuation becomes critical.

Highlights

  • 5/16"-18 UNC thread fits standard coarse holes
  • Spiral point pushes chips forward for through-hole work
  • TiN coating reduces wear on high-speed steel
  • Two-flute design clears swarf efficiently
  • H3 limit meets Class 3B fit tolerance

Specifications

BrandWestward
TypeHole, Drill, Bore & Wire Gauges

Questions about this item

What tap wrench size fits the 5/16"-18 UNC spiral point tap?

Use a tap wrench that accepts a 5/16 inch shank; the overall length is 2 23/32 inches and the thread length is 1 1/8 inches.

How do I start the tap straight in the drilled hole?

Align the tap perpendicular to the workpiece, apply steady downward pressure while turning clockwise, and use cutting fluid to prevent the 2-flute TiN tip from wandering.

When should I replace this H3 class tap?

Replace it when threads show galling, the TiN coating wears off the flutes, or the tap no longer cuts a clean 3B class fit in 5/16"-18 UNC holes.

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