Hertel 87074 Straight Flute Tap 2-5/8-12 Uns 6 Flute

Product Description

The HERTEL 87074 is a straight flute plug tap designed for cutting internal threads in a 2-5/8-12 UNS thread form. Built from high speed steel with a bright, uncoated finish, this tap delivers consistent thread geometry across a range of workpiece materials. It features 6 flutes for chip clearance and smooth cutting action, with a plug chamfer that provides a gradual lead-in for general-purpose through-hole and blind-hole threading. The H6 thread limit provides a controlled fit tolerance, making it suitable for precise threading applications. With a thread length of 2 inches and an overall length of 5.5 inches, this tap is sized for larger-diameter threading operations typically performed on manual or CNC machine tools.

This tap is used in metalworking and machining applications where large-diameter UNS threads are required. The plug chamfer style makes it appropriate for both through-hole threading and blind holes with adequate depth. It is typically used in industrial maintenance, toolroom, and production environments where a 2-5/8-12 UNS thread form is specified. Machinists and toolroom technicians working with large fastener bores, flanges, or custom mechanical assemblies are the primary users of this size range.

Key Features

• 2-5/8-12 UNS thread form for large-diameter applications
• 6 straight flutes for efficient chip evacuation and cutting stability
• Plug chamfer provides gradual lead-in suitable for through-hole and sufficiently deep blind-hole threading
• H6 thread limit for controlled tolerance and consistent fit
• High speed steel construction offers durability across a range of workpiece materials
• Bright, uncoated finish with no coolant-through requirement

Compatibility

Designed as a standard replacement or production tap for machining operations requiring a 2-5/8-12 UNS internal thread. Compatible with machine tapping setups on manual mills, lathes, and CNC machining centers equipped with the appropriate tap holder for this shank diameter.

Installation Notes

This tap is intended for installation by qualified machinists using appropriate machine tapping equipment or a rigid tap holder. Ensure the workpiece is securely fixtured and the spindle is properly aligned before beginning the tapping operation. Use cutting fluid appropriate for the workpiece material to extend tool life and maintain thread quality. Follow machine tool manufacturer guidelines for spindle speed and feed rate selection when tapping at this diameter.