Osg 2869308 Thread Forming Tap M12x1.75 6H Bottoming Ticn

Product Description

The OSG 2869308 is a bottoming-style thread forming tap designed to produce M12x1.75 metric coarse internal threads in blind holes. Manufactured from high-speed steel with a TiCN coating, it delivers improved wear resistance and reduced friction during the forming process. Thread forming taps displace material rather than cutting it, producing stronger threads with no chip generation. With a 6H class of fit, the 2869308 meets standard metric tolerance requirements for general mechanical assemblies. Overall length is 3.3465 inches with a thread length of 0.8268 inches and a tapping depth of 1.9331 inches. Installation is performed by machinists and tool-room technicians in production and maintenance environments.

This tap is suited for blind hole threading operations in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel workpieces. The bottoming chamfer (1.5 to 2 thread lead) allows threading close to the bottom of a blind hole, making it the correct choice when full thread depth near the base of a pocket is required. Right-hand thread direction is standard. The HY-PRO NRT series 286 is a commonly specified tool for CNC tapping centers and manual tapping operations where chip-free threading is preferred.

Key Features

• Thread forming (chipless) design produces stronger threads by cold-working the material
• TiCN coating increases surface hardness and reduces built-up edge on aluminum and steel
• Bottoming chamfer (1.5-2P) enables threading to near full depth in blind holes
• 6H class of fit meets standard metric tolerance for general-purpose assemblies
• Right-hand, M12x1.75 metric coarse thread form
• No coolant-through requirement simplifies use in standard tapping setups

Compatibility

Designed for blind hole threading in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. Suitable for use in CNC machining centers, drill presses, and manual tapping fixtures configured for M12x1.75 right-hand metric coarse thread production.

Installation Notes

Thread forming taps require a properly sized forming tap drill hole — consult OSG or standard metric forming tap drill charts for the correct pilot diameter before use, as the drill size differs from a cutting tap application. Secure the tap in a floating or rigid holder appropriate for the machine and workpiece material. Apply tapping fluid or cutting oil rated for the workpiece material to prevent galling, particularly in steel. Always confirm the tapping depth does not exceed the rated tapping depth of 1.9331 inches to avoid tap breakage in blind holes.