Helicoil
Helicoil 6CPB Straight Flute Hand Tap 3/8"-16 UNC Plug 4 Flutes
A straight-flute hand tap cuts 3/8"-16 UNC threads with a plug chamfer and four flutes
- TypeHole, Drill, Bore & Wire Gauges
- High-speed steel construction resists wear
- Plug chamfer starts threads cleanly in through-holes
- Four flutes evacuate chips efficiently
- UNC 3/8"-16 thread size matches standard coarse pitch
- Right-hand cutting direction suits conventional tapping operations
Thread Repair Tap for 3/8"-16 UNC Holes
This HELI-COIL straight flute hand tap creates internal threads sized for 3/8"-16 UNC screw thread inserts. The plug chamfer and four-flute design suit through-hole and blind-hole work in general-purpose materials. It is intended for mechanics and maintenance technicians who need to restore damaged threads to a standard size.
Verify Hole Size and Material Compatibility
Before ordering, confirm the existing hole matches the required tap drill diameter for a 3/8"-16 UNC STI tap. The high-speed steel construction with a bright uncoated finish performs best in ferrous and non-ferrous metals; it is not suited for hardened steels or abrasive composites. Right-hand cutting direction must match the application.
Fits Standard Tap Wrenches and Frees Damaged Threads
The 3 3/8 inch overall length and 1 21/32 inch thread length engage standard tap holders without special adapters. The H3 thread limit produces a class 2B fit for HELI-COIL inserts, letting you salvage stripped or worn holes without replacing the parent component. Four flutes provide balanced chip evacuation in typical workshop conditions.
Highlights
- High-speed steel construction resists wear
- Plug chamfer starts threads cleanly in through-holes
- Four flutes evacuate chips efficiently
- UNC 3/8"-16 thread size matches standard coarse pitch
- Right-hand cutting direction suits conventional tapping operations
Specifications
| Brand | Helicoil |
|---|---|
| Type | Hole, Drill, Bore & Wire Gauges |
Questions about this item
What comes in the box and what must be purchased separately?
The box contains the straight-flute hand tap only; a matching drill bit, tap wrench and cutting fluid are not included.
Which thread size and pitch should I select for a 3/8"-16 UNC hole?
Choose the 3/8"-16 UNC version — it matches the stated thread size and pitch exactly.
What does the 3 3/8 in overall length mean when the tap is in the machine?
The 3 3/8 in overall length is the total tool length from shank end to tip when mounted in the holder.
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