Irwin 80230 Tap Drill Set 1/4-20 Spiral Flute 2 Piece

Product Description

The IRWIN 80230 is a 2-piece tap and drill set designed for cutting 1/4-20 unified coarse threads in metal. The set pairs a 1/4-20 carbon steel spiral flute tap with a 13/64-inch high speed steel drill bit sized to produce the correct pilot hole for that thread form. The plug chamfer on the tap allows it to start in through-holes and blind holes with moderate depth. This set is suited for maintenance technicians, pipefitters, electricians, and general trade professionals who need a matched tap-and-drill combination for field threading work.

The 80230 is used wherever 1/4-20 threaded holes are required in mild steel, aluminum, and similar materials. Common applications include electrical enclosure work, equipment fabrication, HVAC bracket and panel assembly, and general mechanical repairs. The bright finish on the tap provides a baseline level of corrosion resistance for shop and field storage. The 13/64-inch drill corresponds directly to the standard recommended drill size for a 1/4-20 tap, eliminating guesswork when selecting bit-to-tap pairings on the job.

Key Features

• 1/4-20 spiral flute tap clears chips efficiently in through-hole and blind-hole applications
• Plug chamfer (3-5 thread lead) allows easy thread starting without a dedicated starter tap
• 13/64-inch HSS drill bit matched to the correct pilot hole diameter for 1/4-20 threads
• Carbon steel tap with bright finish suited for general-purpose threading in softer metals
• 2-piece matched set reduces the chance of mismatched drill-to-tap combinations

Compatibility

Designed as a standard OEM-style tap and drill combination for cutting 1/4-20 unified coarse threads in typical trade and maintenance applications.

Installation Notes

Threading operations should be performed by a qualified technician familiar with proper tap speeds and cutting fluid use. Secure the workpiece firmly before drilling and tapping to prevent movement. Apply appropriate cutting fluid for the base material to extend tap life and improve thread quality. Back the tap out periodically to clear chips, particularly in blind-hole applications, to avoid tap breakage.