Greenfield Threading
Greenfield Threading CHICAGO-LATROBE 282470 Spiral Point Tap Plug, 3 Flutes
Spiral point tap cuts 5/16-18 UNC threads in through holes with three flutes and H5 limit
- Spiral-point design pushes chips forward for smoother tapping
- 3-flute high-speed steel construction delivers strength and chip clearance
- UNC 5/16-18 thread size fits standard coarse-pitch applications
- H5 thread limit with 2B-3B class of fit ensures accurate engagement
- Bright uncoated finish suits general-purpose threading work
Chicago-Latrobe 282470 Spiral Point Tap
The Chicago-Latrobe 282470 is a spiral point tap designed for creating unified coarse threads in through-hole applications. It suits machinists and maintenance technicians who need reliable thread production in steel or similar materials. The high speed steel construction provides durability for general-purpose threading tasks. This plug-style tap features a right-hand cutting direction for standard thread orientation.
Installation and common issues
Secure the workpiece firmly and use the correct 75 percent thread drill size F before starting the tap. Apply cutting fluid to reduce friction and prevent premature wear on the high speed steel flutes. The spiral point design pushes chips ahead of the cut, but chip packing can still occur if the hole depth exceeds the thread length. Misalignment during entry often leads to oversized threads or tap breakage in harder stock.
Pre-order checks
Verify the required thread specification matches 5/16 In. -18 UNC with a class of fit 2B-3B and H5 thread limit. Confirm the overall length of 2 23/32 in and thread length of 11/16 in suit your tool holder and workpiece thickness. Ensure the machine spindle or tap handle accommodates the tap shank for right-hand operation. Buyers needing coated taps or different thread limits should select an alternative product.
Highlights
- Spiral-point design pushes chips forward for smoother tapping
- 3-flute high-speed steel construction delivers strength and chip clearance
- UNC 5/16-18 thread size fits standard coarse-pitch applications
- H5 thread limit with 2B-3B class of fit ensures accurate engagement
- Bright uncoated finish suits general-purpose threading work
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
How can I confirm the tap is cutting correctly after setup?
Check that the spiral point pushes chips ahead of the cut and the 3 flutes produce clean threads in a 5/16-18 UNC hole drilled with an F-size bit
What comes in the package and what must I supply?
The box contains the CHICAGO-LATROBE 282470 spiral point tap plug; you must provide a 5/16-18 UNC drill bit of size F and a suitable tap handle or holder
Which version should I choose for a standard fit?
Select the H5 thread limit with Class of Fit 2B-3B for general-purpose internal threading in materials suited to high-speed steel
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