Westward
Westward 5TWD3 Spiral Point Tap 5/16-18 UNC 2 Flutes Bright
Cuts 5/16"-18 UNC threads in through-holes with a bright HSS body and two spiral-point flutes for chip clearance
- TypeHole, Drill, Bore & Wire Gauges
- Cuts clean threads in through-holes with spiral point design
- High-speed steel construction resists wear during repeated tapping operations
- Bright uncoated finish allows visual inspection of cutting edges
- Two-flute geometry provides efficient chip evacuation in 5/16-18 UNC threads
- Right-hand thread orientation matches standard fastener requirements
Westward 5/16-18 UNC Spiral Point Tap
This Westward spiral point tap cuts 5/16-18 UNC threads in through-holes using high speed steel. The bright uncoated finish suits general purpose threading in steel and non-ferrous metals. Two flutes push chips ahead of the cut for cleaner holes. Right hand threads follow standard fastener conventions.
H3 limit and 3B class of fit define tolerance
The H3 thread limit and 3B class of fit set the pitch diameter tolerance for this tap. These fixed values determine whether the finished thread meets the required gauge fit. No adjustment is possible once the tap is selected. Users must verify the specification matches the drawing before cutting.
Plug chamfer starts threads in through holes
The plug chamfer provides a moderate lead for starting threads in through holes. High speed steel requires cutting fluid and proper alignment to avoid breakage. Chips exit forward so the hole must remain clear. Reversing the tap frequently clears packed chips in deeper cuts.
Highlights
- Cuts clean threads in through-holes with spiral point design
- High-speed steel construction resists wear during repeated tapping operations
- Bright uncoated finish allows visual inspection of cutting edges
- Two-flute geometry provides efficient chip evacuation in 5/16-18 UNC threads
- Right-hand thread orientation matches standard fastener requirements
Specifications
| Brand | Westward |
|---|---|
| Type | Hole, Drill, Bore & Wire Gauges |
Questions about this item
Should I choose a 2-flute spiral point tap or a different flute count for this thread size?
The 2-flute design on this 5/16-18 UNC tap pushes chips ahead of the cut, reducing torque and helping prevent breakage in through holes.
What does the H3 thread limit mean when I cut threads in steel?
H3 allows a slightly larger pitch diameter than basic size, giving a 3B class of fit that suits general-purpose threading in steel and most non-ferrous metals.
How does the bright uncoated high-speed steel affect tool life in this tap?
Bright high-speed steel relies on cutting fluid for heat resistance; it works well in low-carbon steel and aluminium but wears faster in abrasive or high-alloy materials.
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