Hertel K027789AS M18 X 2.50 Straight Flute Tap Hss Plug

Product Description

The HERTEL K027789AS is a straight flute tap designed for cutting metric coarse internal threads in a wide range of materials. Built from high speed steel with a bright, uncoated finish, this plug chamfer tap is suited for through-hole and blind-hole threading operations where chip evacuation is manageable and thread quality is critical. The M18 x 2.50 thread profile and D7 thread limit make it appropriate for standard metric fastener applications across general manufacturing and maintenance environments. With an overall length of 4-1/32 inches and a 4-flute configuration, it delivers stability and consistent thread form under normal tapping conditions.

This tap is used in machine shop, maintenance, and production environments for threading M18 x 2.50 metric coarse holes in ferrous and non-ferrous base materials. The plug chamfer style provides a gradual lead-in suitable for both through-holes and sufficiently deep blind holes. It is driven by a tapping head, CNC machine, or manual tap wrench depending on the application. Right-hand thread direction matches standard metric bolt orientation. Coolant-through capability is not included, so flood or brush-applied cutting fluid should be used to manage heat and tool life.

Key Features

• M18 x 2.50 metric coarse thread form with D7 thread limit for standard tolerance fits
• 4-flute straight configuration provides rigidity and consistent thread form in stable setups
• Plug chamfer offers a gradual lead-in appropriate for through-holes and deep blind holes
• High speed steel construction handles a broad range of workpiece materials
• Bright, uncoated finish allows direct inspection of tool wear and is compatible with most cutting fluids
• Right-hand thread direction for standard metric fastener compatibility

Compatibility

Designed for use in applications requiring M18 x 2.50 metric coarse internal threads with a D7 thread limit, compatible with standard tap holders and tapping chucks sized for the tap shank.

Installation Notes

A licensed machinist or qualified maintenance technician should perform tapping operations following established shop safety procedures. Ensure the workpiece is securely fixtured and the tap is properly aligned before beginning the threading cycle to prevent tap breakage. Apply an appropriate cutting fluid throughout the operation to reduce heat buildup and extend tool life. Never reverse a broken tap with force; use an appropriate tap extractor or EDM process for removal.