Hand Tap Set HSS 3-Piece (Taper / Plug / Bottom) CHUOKU
Description
Hand Tap Set HSS 3-Piece (Taper / Plug / Bottom) CHUOKU
The CHUOKU 3-piece HSS hand tap set cuts internal threads by hand and includes a taper tap, a plug tap, and a bottoming tap — everything needed to start, run through, and finish blind-hole threads. Suited to internal threads up to 25 mm, made from high-speed steel for heat resistance and a long-lasting edge. Supplied by BOWMAP Industry & Tooling, Samut Prakan.
Specifications
| Brand | CHUOKU |
|---|---|
| Material | High-speed steel (HSS) |
| Pieces per set | 3-piece set |
| Set contents | Taper / Plug / Bottoming |
| Internal thread range | Up to 25 mm |
| Lead taper | Taper 8–10 threads · Plug ~3 threads · Bottom chamfered 45° |
| Thread standards available | BSW · UNF · BSP · NPT (inch & pipe threads) — confirmed from product images/tags |
| Thread sizes available | UNF is the inch-size standard — see the size list on the product page |
Use cases
- Cutting through-hole and blind-hole threads in repair and assembly work
- Starting a square thread with the taper tap before running the plug tap
- Finishing threads to the bottom of a blind hole with the bottoming tap
- On-site threading without a tapping machine, used with a tap wrench
- Re-cutting damaged existing threads back to usable condition
Compatibility
Use with a tap wrench sized to the tap shank. Always drill the correct tap-drill size first (slightly smaller than the tap diameter) per the tap-drill chart, and use cutting oil to clear heat. Turn 4 turns forward, back off 4 turns to break the chip, and repeat.
Availability
In stock at the BOWMAP warehouse in Samut Prakan, ready for same-day pickup or next-day delivery across Bangkok and the surrounding provinces. Contact us for bulk pricing on large orders.
Related products
- CHUOKU tap wrench
- CHUOKU machine tap straight-flute PO
- Threading dies (Die)
- HSS drill bits for pilot holes
FAQ
Which tap in the 3-piece set do I use first?
Always start with the taper tap (8–10 thread lead) because it helps the tap enter square and start easily. Then use the plug tap to run the thread deeper. For through holes those two are enough; for a blind hole, finish with the bottoming tap to cut threads all the way to the bottom.
What drill size do I use before tapping?
The hole must be slightly smaller than the tap so there is material to cut the thread. A simple rule is: tap-drill size = tap diameter − pitch (e.g. M6 × 1.0 mm pitch needs a 5.0 mm hole). Refer to a tap-drill chart for exact sizes.
Can an HSS hand tap cut stainless steel?
Yes for low volumes, but stainless is tough and builds heat, so use a stainless-grade tapping oil, turn slowly, and back off frequently to break chips. For high-volume stainless work, a machine tap in a stainless grade will last longer.
