CoilThread STI Taps
CoilThread® STI (Screw Thread Inserts) Taps are designed specifically to create internal threads that will accommodate a CoilThread® insert. CoilThread® Taps can be used in a range of materials including aluminium, magnesium, steel, plastics and other free machining materials. CoilThread® Taps are manufactured from High Speed Steel for durability and prolonged tooling life.
Features & Benefits
- STI Taps can be used for both Tangless® and Tanged CoilThread® inserts.
- Available in 3B and 2B (Unified) or 4H and 5H (Metric) Class of Fit.
- Available for a full range of Unified and Metric thread sizes.
- Lower cost than similar taps from competitors.
We offer four STI tap styles for various applications:
Easy starting for through-holes and blind holes.
Ideal for blind holes that are drilled to a minimum depth.
Spiral Pointed Plug
Free-cutting for use in long through-holes and in blind holes with chip clearance.
Spiral Flute Bottoming
Designed to pull chips out of deep or blind holes in soft materials
Example of an STI Taps part number:
CT C - 02 SRP - H1
1 2 3 4 5
Style / Type
Class of Fit
|CT - CoilThread® Tap (STI)||C - Unified Coarse
F - Unified Fine
M - Metric
|---||SRP - Standard Regular Plug
SRB - Standard Regular Bottoming
SPP - Spiral Point Plug
SFB - Spiral Flute Bottoming
|Tangless® or Tanged||Tool||Type of Tool||Metric||Size||Free Running or Locking|
|Insertion Tool||M||2.5-12||F= Free Running|
|2= Tangless®||L= Locking|