Osg 1977600 Straight Flute Tap M14x1.50 Metric Fine Hss

Product Description

The OSG 1977600 is a straight flute plug tap designed for cutting M14x1.50 metric fine internal threads in a range of ferrous and non-ferrous materials. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap is suited for general-purpose threading operations where coolant-through tooling is not required. It features 4 flutes and a plug chamfer, which provides a gradual thread lead-in that works well in through-hole and semi-blind applications. The overall length is 3.594 inches (91.3 mm), and the thread length is 1.656 inches (30.8 mm). The D6 thread limit designation indicates a Class 3 tolerance range appropriate for standard fit threaded assemblies. This tool is used by machinists, maintenance technicians, and tool-and-die tradespeople.

The OSG 1977600 is applied in production and maintenance machining environments where metric fine threads are required. Its material compatibility covers aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel, making it a versatile tap for mixed-material shops. The plug chamfer style makes this tap a common choice when starting a thread in a through-hole or when a partial blind-hole lead is acceptable. It belongs to the OSG Series 141 straight flute tap line.

Key Features

• M14x1.50 metric fine thread form for precise, close-tolerance assemblies
• 4-flute straight design provides chip support and stability during the cut
• Plug chamfer (3-5 thread lead) suitable for through-holes and shallow blind holes
• High-speed steel construction offers durability across a broad range of workpiece materials
• Bright/uncoated finish for compatibility with standard cutting fluids and oils
• D6 thread limit for standard Class 3 fit tolerance
• Right-hand thread direction, conventional tapping operation

Compatibility

Designed for cutting M14x1.50 metric fine internal threads in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. Not rated for coolant-through applications.

Installation Notes

This tap is installed using a standard tap wrench, tapping head, or CNC rigid tapping setup with a properly sized M14x1.50 tap drill. Always ensure the workpiece is securely fixtured before threading. Apply an appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Disengage the tap carefully when approaching the bottom of a blind hole to avoid breakage.