Irwin 1717ZR Straight Flute Tap M4x0.7 Metric Coarse

Product Description

The IRWIN 1717ZR is a straight flute tap designed for cutting M4x0.7 metric coarse internal threads in through-holes and blind holes where chip clearance allows. Made from carbon steel, it features a plug chamfer style with 4 flutes and a right-hand thread direction. The overall length is 3 inches with a thread length of 1.5 inches, making it suitable for standard threading tasks in metal fabrication, maintenance, and repair work. This tap is used by machinists, tool and die workers, and general tradespeople who need reliable metric thread cutting without the added cost of high-speed steel or coated tooling.

This tap is suited for threading operations in softer materials such as aluminum, mild steel, and plastics where the properties of carbon steel are adequate. The plug chamfer design starts the tap with a moderate lead, making it appropriate for both through-holes and relatively accessible blind holes. It fits standard tap handles and is a common choice for benchtop drilling, machine tapping, and field repair applications requiring M4x0.7 metric coarse threads. The 2B class of fit produces a standard tolerance thread suitable for general fastener assembly.

Key Features

• M4x0.7 metric coarse thread profile for standard metric fastener compatibility
• Plug chamfer with 4 flutes provides moderate lead-in and balanced chip control
• 2B class of fit delivers standard tolerance threads for general assembly use
• Carbon steel construction suited for softer metals, plastics, and light fabrication work
• Right-hand thread direction, compatible with standard tap wrenches and holders
• No coolant-through design — standard manual or machine tapping without internal coolant required

Compatibility

Designed as a standard M4x0.7 metric coarse plug tap for use with conventional tap handles, T-handles, and machine tap holders accepting a 0.25-inch shank diameter and 0.25-inch square drive size.

Installation Notes

This tap should be installed by machinists or skilled tradespeople familiar with threading operations. Before tapping, ensure the workpiece is securely clamped and the pilot hole is drilled to the correct tap drill diameter for M4x0.7 threads. Apply appropriate cutting fluid to extend tool life and improve thread quality. Back the tap out periodically to break and clear chips, particularly in blind hole applications.