Hertel K020090AS M3 X 0.50 Bottoming Tap 3 Flute Hss

Product Description

The HERTEL K020090AS is a straight flute bottoming tap designed for cutting internal metric coarse threads in blind holes and close-tolerance applications. Built from high speed steel with a bright uncoated finish, this tap produces M3 x 0.50 threads with a right-hand direction and a D1 thread limit for precise fit. The 3-flute straight design channels chips efficiently in short, controlled cuts. With an overall length of 1.9375 inches and a thread length of 0.625 inches, it is sized for compact workpieces requiring full thread depth close to the bottom of a hole. Machinists and toolroom technicians use this tap in manual, CNC, and drill-press operations on steel, aluminum, and similar materials.

This tap is suited for production and maintenance environments where M3 metric coarse threads are required. The bottoming chamfer — typically 1 to 2 threads of lead — allows threading to the full depth of a blind hole, making it the preferred finishing tap in a 3-tap sequence or for re-threading existing holes. It is appropriate for light-duty to medium-duty materials and is commonly used in instrument manufacturing, electronics hardware, automotive components, and general fabrication shops.

Key Features

• Bottoming chamfer cuts threads to the bottom of blind holes with minimal runout
• M3 x 0.50 metric coarse thread form for standard hardware compatibility
• High speed steel construction provides wear resistance across a broad range of workpiece materials
• Bright uncoated finish offers a consistent surface without added coating thickness
• D1 thread limit ensures tight, accurate thread tolerance control
• Right-hand thread direction for standard tapping operations

Compatibility

Designed as a standard OEM-style replacement or direct-use tap for M3 x 0.50 metric coarse bottoming applications in manual and machine tapping setups.

Installation Notes

Tapping operations should be performed by a qualified machinist following applicable shop safety procedures. Always secure the workpiece firmly and ensure the tap is properly aligned before starting the cut to prevent breakage. Apply cutting fluid appropriate to the workpiece material to reduce heat and extend tap life. If used as the final tap in a sequence, complete plug or taper tapping first before switching to this bottoming tap.