Westward
Westward 2LWN3 Straight Flute Hand Tap 3/8"-16 Bottoming 4 Flutes UNC
A straight-flute hand tap cuts 3/8"-16 UNC threads to the bottom of a blind hole using four high-speed steel flutes
- TypeHole, Drill, Bore & Wire Gauges
- High-speed steel construction resists wear during repeated threading
- Bottoming chamfer cuts full threads to the bottom of blind holes
- 3/8"-16 UNC size matches standard coarse-thread fasteners
- Four straight flutes evacuate chips efficiently in through and blind holes
- Bright uncoated finish suits general-purpose tapping in steel and cast iron
Westward 3/8"-16 UNC Bottoming Tap
This Westward straight flute hand tap cuts internal UNC threads in a 3/8"-16 hole. It suits maintenance technicians and machinists who need to create new threads or clean damaged ones in steel, aluminium or plastic workpieces. The H5 thread limit provides a standard fit for general-purpose threading tasks.
Bottoming chamfer for blind-hole threading
The bottoming chamfer has only one to two tapered threads, letting the tap cut close to the bottom of a blind hole. This specification decides whether the tool reaches full thread depth in holes that do not pass through the material. A taper or plug tap would leave an incomplete thread at the base.
Straight flutes need manual chip clearing
Four straight flutes give strength but do not pull chips forward like spiral flutes. In blind holes you must back the tap out frequently to clear swarf, or chips will pack and break the tool. Use cutting fluid and a tap wrench; power tapping without rigid synchronization often snaps the flutes.
Highlights
- High-speed steel construction resists wear during repeated threading
- Bottoming chamfer cuts full threads to the bottom of blind holes
- 3/8"-16 UNC size matches standard coarse-thread fasteners
- Four straight flutes evacuate chips efficiently in through and blind holes
- Bright uncoated finish suits general-purpose tapping in steel and cast iron
Specifications
| Brand | Westward |
|---|---|
| Type | Hole, Drill, Bore & Wire Gauges |
Questions about this item
What does the 3/8"-16 thread size mean when cutting threads in a workpiece?
It produces a unified coarse thread with a 3/8 inch major diameter and 16 threads per inch, matching standard UNC fasteners of that size.
How does the H5 thread limit affect the fit of the finished thread?
The H5 limit sets the pitch diameter tolerance for a class 2B internal thread, giving a standard fit for general-purpose bolts and screws.
What overall length and shank dimensions should I check for tool holder clearance?
The tap measures 2 15/16 inches overall with a 1 1/4 inch thread length; the shank fits standard 3/8" tap wrenches and holders.
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