Greenfield Threading
Greenfield Threading Spiral Point Tap 282801 1/2-13 UNC 3 Flutes HSS
Spiral-point tap cuts 1/2-13 UNC threads in through-holes using three-flute high-speed steel
- Spiral-point design pushes chips forward for smoother through-hole tapping
- Three flutes balance chip clearance and cutting strength in steel
- High-speed steel construction resists wear during repeated use
- 1/2-13 UNC thread fits standard coarse-pitch fasteners
- Bright uncoated finish suits general-purpose machining tasks
Application and User
The Greenfield Threading Spiral Point Tap 282801 cuts 1/2-13 UNC threads in through-holes or deep blind holes. It suits maintenance technicians and metalworkers who need reliable thread production in steel or similar materials. The H3 limit and 2B class of fit meet standard industrial requirements. Buyers who need coated tooling or left-hand threads should look elsewhere.
Installation and Common Issues
The bright uncoated high-speed steel body requires cutting fluid to prevent galling and premature wear. The spiral-point geometry pushes chips ahead of the tap, so the 0.4219 in drill size must be held accurately to avoid oversize threads. Misalignment during starting is the main cause of broken flutes or bell-mouthed holes in harder stock.
Interface Limits
The 3 3/8 in overall length and 15/16 in thread length restrict reach in deep or counterbored holes. The 75 percent thread engagement rule tied to the specified drill size balances strength against tapping torque. Right-hand cutting direction and three-flute design limit use to conventional clockwise threading operations only.
Highlights
- Spiral-point design pushes chips forward for smoother through-hole tapping
- Three flutes balance chip clearance and cutting strength in steel
- High-speed steel construction resists wear during repeated use
- 1/2-13 UNC thread fits standard coarse-pitch fasteners
- Bright uncoated finish suits general-purpose machining tasks
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
How do I confirm the 1/2-13 UNC threads are cutting correctly after setup?
Check that the tap produces a 75 percent thread depth using the .4219 in drill size and that chips are pushed forward by the spiral-point design.
What comes in the box with the 282801 tap and what must I supply?
The box contains the HSS spiral-point tap only; you must supply a .4219 in drill bit, tapping fluid and a tap wrench or powered holder.
Which thread limit and flute count should I choose for a standard 2B fit?
Select the H3 limit with three flutes, as this combination matches the 1/2-13 UNC 2B specification shown for the 282801 model.
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