Greenfield Threading
Greenfield Threading Spiral Point Tap Plug 3 Flutes 330123
Spiral point tap cuts 1/2-13 UNC threads in through-holes using three flutes and H3 limit for 2B class fit
- Spiral point pushes chips ahead for cleaner threads in through-holes
- Three flutes balance chip clearance and cutting strength for efficient tapping
- High-speed steel with black oxide resists wear and reduces galling
- H3 limit and 2B fit produce accurate 1/2-13 UNC threads
- 75 % thread drill size .4219 in simplifies hole preparation
1/2"-13 UNC Spiral Point Tap
This Greenfield Threading spiral point tap produces unified coarse threads in a 1/2 inch diameter with 13 threads per inch. The CHICAGO-LATROBE tool is manufactured from high speed steel with a black oxide finish for durability. It features a plug chamfer style and three flutes designed to push chips ahead of the cutting action in through-hole applications.
General Machine Threading Tasks
The tap suits machinists and maintenance technicians cutting standard UNC threads in through holes where forward chip evacuation is preferred. The H3 thread limit provides a standard class 2B fit for general-purpose assembly. Buyers needing to cut threads in blind holes should look at a bottoming or taper chamfer design instead.
H3 Thread Limit Specification
The thread limit is marked H3, which determines the pitch diameter tolerance and resulting class of fit for the finished thread. This single specification confirms whether the tap matches the required allowance for the specific mating hardware being used. Selecting the incorrect limit results in threads that are too tight or too loose for the application.
Highlights
- Spiral point pushes chips ahead for cleaner threads in through-holes
- Three flutes balance chip clearance and cutting strength for efficient tapping
- High-speed steel with black oxide resists wear and reduces galling
- H3 limit and 2B fit produce accurate 1/2-13 UNC threads
- 75 % thread drill size .4219 in simplifies hole preparation
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
What comes with the CHICAGO-LATROBE 330123 tap and do I need a separate drill bit?
The box contains the spiral point tap only. You must purchase a 0.4219 in drill bit separately to prepare the 75 percent thread hole before tapping.
Which thread size and limit does the 330123 cover and when would I choose it?
This tap cuts 1/2 in.-13 UNC threads to a H3 limit for a 2B class of fit. Choose it when the drawing specifies that exact size, pitch and tolerance.
What does the 3 3/8 in overall length mean when the tap is in my machine?
The 3 3/8 in overall length is the total tool length from shank end to tip. The cutting portion itself is 1 21/32 in long, so ensure your holder and workpiece clearance accommodate both dimensions.
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