Greenfield Threading
Greenfield Threading CHICAGO-LATROBE 330126 Spiral Point Tap Plug 3 Flutes pneumatic accessory
Spiral-point tap cuts 5/8 inch UNC threads with three flutes in high-speed steel
- Spiral point drives chips ahead for smoother threading in through-holes
- High-speed steel with black oxide resists wear during repeated tapping operations
- 5/8‑11 UNC thread size matches standard coarse‑pitch fastener requirements
- Three‑flute design balances chip clearance and cutting strength
- Plug chamfer starts threads easily in pre‑drilled holes
CHICAGO-LATROBE 330126 Spiral Point Tap
This spiral point tap from CHICAGO-LATROBE is a high-speed steel threading tool designed for creating UNC threads in through-hole applications. It features a plug chamfer and three flutes to push chips ahead of the cut. The black oxide finish adds wear resistance for general-purpose metalworking tasks.
Suited for right-hand UNC threading in through holes
Machinists cutting 5/8 inch -11 UNC threads in through-holes will find this H3 limit tap matches a class 2B fit. It is not for blind holes where chips must be pulled upward, nor for left-hand threads, metric profiles, or different thread classes. The fixed geometry also prevents use on diameters other than 5/8 inch.
5/8 inch -11 UNC thread size defines fit
The thread size of 5/8 inch -11 UNC is the single specification determining compatibility with the target hole and fastener. The H3 thread limit and class 2B fit further define the tolerance zone. Verify the workpiece requires this exact diameter, pitch, and thread standard before purchasing.
Highlights
- Spiral point drives chips ahead for smoother threading in through-holes
- High-speed steel with black oxide resists wear during repeated tapping operations
- 5/8‑11 UNC thread size matches standard coarse‑pitch fastener requirements
- Three‑flute design balances chip clearance and cutting strength
- Plug chamfer starts threads easily in pre‑drilled holes
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
Does the tap come in a set or do I need to buy the handle and lubricant separately?
The listing is for the single spiral-point tap only; a tap wrench or handle and cutting fluid are not included and must be purchased separately.
How do I choose between the available thread limits for the 5/8-11 UNC size?
This model is offered in thread limit H3 only, which matches a 2B class of fit for standard internal threading.
What does the 75 percent thread drill size of 13.60 mm mean when I am cutting threads in the workshop?
Drill the hole to 13.60 mm before tapping; the tap will then produce threads at roughly 75 percent of full thread height for the 5/8-11 UNC size.
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