Hertel K025215AS M5.5x0.90 Straight Flute Tap Hss

Product Description

The HERTEL K025215AS is a straight flute bottoming tap designed for cutting M5.5x0.90 metric coarse internal threads in machined parts and assemblies. Manufactured from high-speed steel with a bright, uncoated finish, this tap produces clean right-hand threads in through-holes and blind holes where full thread depth close to the bottom is required. The bottoming chamfer engages the workpiece aggressively, making it suitable for finishing operations that follow a taper or plug tap. With 4 flutes and a D3 thread limit, it delivers consistent thread tolerance in a range of materials. Machinists and tool and die technicians are the primary users in production and job-shop environments.

This tap is suited for metric threading applications in ferrous and non-ferrous materials where M5.5x0.90 threads are specified. Typical use cases include tapping threaded fastener holes in fixtures, brackets, tooling plates, and precision components. The bottoming configuration is particularly relevant when thread engagement must extend to the floor of a blind hole, a common requirement in close-tolerance assemblies. The straight flute geometry works well in materials that produce short, brittle chips, such as cast iron and brass.

Key Features

• Bottoming chamfer for threading to near-full depth in blind holes
• M5.5x0.90 metric coarse thread form, right-hand direction
• 4-flute straight design suited for short-chip materials
• High-speed steel construction for durability in general-purpose tapping
• D3 thread limit for consistent tolerance class in metric threading
• Bright, uncoated finish compatible with most standard cutting fluids

Compatibility

Designed as a standard bottoming tap for M5.5x0.90 metric coarse threaded holes in general machining applications where a straight flute, high-speed steel tap is specified.

Installation Notes

This tap should be installed and operated by qualified machinists following standard tapping procedures. Always use appropriate cutting fluid for the workpiece material to reduce tool wear and improve thread finish. Secure the workpiece firmly before tapping and ensure the tap is aligned perpendicular to the hole to prevent tap breakage. When tapping blind holes with a bottoming tap, use a taper or plug tap first to establish the thread before switching to the bottoming tap for final depth.