Draper 10 Piece UNF Hand Tap Set - 79199

UNF stands for Unified National Fine, which refers to the thread type of these taps.

These taps can be used on a variety of materials including steel, aluminum, and some plastics.

Cutting oil lubricates the tap and workpiece, reducing friction and heat, and helping to prevent the tap from breaking or seizing.

Select the tap size that matches the bolt or screw you intend to use. The tap set includes various sizes indicated in inches (e.g., 1/4" x 28) which refers to the diameter and threads per inch.

Use a brush or compressed air to remove metal shavings. Wipe the taps with a clean cloth, and apply a light coat of oil to prevent rust.

Carefully try using a tap extractor tool to remove the broken tap. Otherwise, you may need to drill out the remaining piece and re-tap the hole with the next larger size.

While it's possible to use these taps with a power tool, it is generally recommended to use them manually with a tap wrench for better control and to avoid breaking the tap.

Ensure the pilot hole is the correct size. Apply sufficient lubrication and avoid excessive force. Try reversing the tap slightly to clear any debris.

Use the correct cutting speed. Ensure the tap is perpendicular to the work surface. Check the tap for damage and replace if necessary.

Reverse the tap slightly to clear debris. Use cutting oil for lubrication. If the tap is severely stuck, consider using a tap extractor tool.