AB Tools Tap & Die Set - 1/4" X 20 BSW

BSW stands for British Standard Whitworth, a unified thread form commonly used in the UK and Commonwealth countries. The '1/4" x 20' indicates a nominal diameter of 1/4 inch with 20 threads per inch.

A taper tap has a gradual taper at the end, making it easier to start a thread. A plug tap has a shorter taper and is used to deepen a thread started by a taper tap or to cut threads in thinner material.

While the die is made from hardened tungsten steel, it is best suited for mild steel, aluminium, and copper. Threading very hard steels may dull the die prematurely. Always use cutting fluid.

Yes, you will typically need a tap wrench to hold and turn the taps, and a die handle (or die stock) to hold and turn the die. Cutting fluid and safety glasses are also recommended.

After each use, clean off all metal chips and cutting fluid with a brush and dry cloth. Store the taps and die in their case in a dry place to prevent rust.

No, this set is specifically for the imperial BSW thread standard (1/4" x 20). Metric threads have different dimensions and pitches.

Ensure you are using adequate lubrication, not forcing the tap, and backing it out periodically to clear chips. Start with the taper tap and ensure the hole is drilled to the correct size.

Verify the die is sharp and clean. Ensure you are using cutting fluid and applying consistent pressure. Check that the workpiece is properly secured and rotating smoothly.

Double-check that you are using the correct die and tap for the 1/4" x 20 BSW size. Ensure the workpiece diameter is suitable for threading with the die.

Use the taper tap first. Ensure the starting hole is perpendicular to the surface and properly centered. Lightly chamfer the edge of the hole if necessary.