Balax 18946-000 Thread Forming Tap M12x1.75 4H Bottoming Hss

Product Description

The BALAX 18946-000 is a thread forming tap designed for cold-forming internal metric threads in blind holes without cutting chips. It produces M12x1.75 metric coarse threads to a 4H class of fit using a bottoming chamfer, making it suited for applications where threads must extend close to the bottom of a stopped bore. Manufactured from high-speed steel with a bright uncoated finish, this tap works by displacing material rather than removing it, resulting in stronger thread forms and no chip evacuation concerns. It is installed using a standard tap wrench or CNC tapping setup and belongs to BALAX series BXMB.

This tap is intended for blind hole threading operations in metals that respond well to cold forming, such as low-carbon steel, aluminum, brass, and similar ductile materials. The bottoming chamfer of 2.5 threads allows threading to within a minimal distance from the hole bottom, which is useful in close-tolerance production fixturing, hydraulic manifolds, and precision machined components. It is used in both manual tapping and machine tapping environments by machinists, tool and die professionals, and production maintenance technicians.

Key Features

• Thread forming design eliminates chips, reducing blind hole tap breakage risk
• Bottoming chamfer with 2.5P chamfered threads for threading close to hole bottom
• M12x1.75 metric coarse thread form, 4H class of fit, right-hand thread direction
• High-speed steel construction for use across a broad range of ductile workpiece materials
• Single oil groove design supports lubrication delivery during the forming operation
• Overall length of 3.375 inches with a 1 inch thread length and 0.367 inch shank diameter

Compatibility

Designed as an OEM-style replacement or direct-use thread forming tap for M12x1.75 metric coarse blind hole applications requiring a 4H class of fit in ductile materials.

Installation Notes

Thread forming taps require a specific forming tap drill size, which differs from standard cut tap drill sizes - always consult a forming tap drill chart for the correct hole diameter before tapping. Apply a suitable tapping fluid or cutting oil rated for thread forming to reduce torque and extend tap life. Secure the workpiece and ensure the tap is started perpendicular to the hole to avoid cross-threading or tap breakage. Power down any machine tool and follow lockout procedures before changing tooling in production environments.