Osg 1978700 Straight Flute Tap M36x4 Metric Coarse Hss

Product Description

The OSG 1978700 is a straight flute tap designed to cut M36x4.00 metric coarse internal threads in a range of ferrous and non-ferrous materials. Built from high-speed steel (HSS) with a bright/uncoated finish, this tap delivers consistent thread quality in production and maintenance machining environments. It features a taper chamfer for guided entry, a 6H class of fit for standard metric tolerance threading, and a D9 thread limit. With an overall length of 6.063 inches and a 3-inch thread length, this tap is sized for deep-reach applications on large-diameter workpieces. Machinists and tool-and-die professionals rely on this size for structural, hydraulic, and heavy equipment component work.

The OSG 1978700 is suited for hand tapping and machine tapping operations on large-diameter through-holes and blind holes where a taper lead is appropriate. Rated material applications include aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. The taper chamfer distributes cutting load across the leading threads, making it a reliable choice when starting a thread in a pre-drilled hole with consistent alignment. This tap fits into standard tapping chucks and tap holders sized for a 1.233-inch shank diameter.

Key Features

• M36x4.00 metric coarse thread form with 6H class of fit for standard tolerance threading
• Taper chamfer for gradual thread engagement and reduced entry force
• High-speed steel construction for durability across ferrous and non-ferrous materials
• Bright/uncoated finish — no coating buildup concerns in sensitive tolerance applications
• 4-flute design provides chip clearance and thread form stability
• Right-hand thread direction; compatible with standard tapping equipment
• D9 thread limit designation for consistent oversize control

Compatibility

Designed as an OEM-style cutting tool replacement or direct procurement option for machine shops and maintenance facilities requiring M36x4.00 metric coarse straight flute taps in HSS with a taper chamfer and 6H fit.

Installation Notes

This tap is installed and operated by machinists using a tapping chuck, T-handle tap wrench, or CNC/manual tapping machine sized for the 1.233-inch shank diameter. Ensure the workpiece is securely fixtured and the pre-drilled hole meets the correct tap drill diameter for M36x4.00 before beginning. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain thread quality. This tap does not support coolant-through operation.