Hertel K029507AS Metric Coarse Tap Set 4 Flute Hss

Product Description

The HERTEL K029507AS is a 3-piece metric coarse tap set designed for threading operations in metal fabrication, maintenance, and repair applications. Built from high speed steel (HSS) with a bright finish, this set delivers consistent thread cutting performance across a range of metric coarse thread sizes. The 4-flute geometry provides clean chip evacuation and stable cutting action. Each tap in the set carries a 6H class of fit and a D4 thread limit, making it suited for standard metric tolerance requirements. Overall length is 2.125 inches per tap. Machinists, tool and die technicians, and maintenance professionals are the primary users of this set.

This tap set is applied in general metalworking environments where metric coarse internal threads are required. Common applications include threading blind and through holes in steel, cast iron, aluminum, and similar machinable materials. The 3-piece set typically includes a taper, plug, and bottoming tap, allowing technicians to start, advance, and finish threads in a single workflow. The metric coarse thread standard makes this set a standard shop tool for equipment repair, fixture fabrication, and production threading tasks.

Key Features

• High speed steel construction for durability across a range of machinable metals
• 4-flute design promotes chip clearance and thread form accuracy
• Bright finish with no coating — suitable for use with cutting fluid
• 6H class of fit meets standard metric thread tolerance specifications
• D4 thread limit for controlled tap-to-thread fit
• 2.125-inch overall length per tap in a 3-piece set

Compatibility

Designed as a standard metric coarse tap set compatible with conventional tap wrenches, T-handle tap wrenches, and machine tap holders accepting straight-shank taps of the appropriate size range.

Installation Notes

Tap installation should be performed by a qualified machinist or maintenance technician familiar with threading operations. Always secure the workpiece firmly before beginning and apply appropriate cutting fluid to reduce heat and extend tap life. Back the tap out periodically to break and clear chips, particularly in blind holes. Inspect taps for wear or damage before each use — a chipped or worn tap can strip threads or break in the hole.