106-4 - Generic 106-4 Propane Cutting Tip for Koike Torches - Size 4

Technical Overview of the Generic 106-4 Koike Style Tip

The Generic 106-4 is a precision-engineered cutting tip designed to be fully compatible with Koike® style oxy-fuel cutting torches. This specific model belongs to the 106 series, which is the standard configuration for Koike hand and machine torches utilizing alternate fuels such as Propane or Natural Gas. The "-4" designation indicates the tip size, which is calibrated for cutting medium-to-heavy steel plates, typically in the range of 3 to 4 inches (approximately 75mm to 100mm) depending on gas pressure and travel speed settings.

Structurally, this tip utilizes a 2-piece design, which is essential for the efficient combustion of propane. Unlike acetylene, propane has a lower flame propagation rate and requires a recess at the tip end to anchor the flame. The 106-4 features a heavy-duty brass inner member with splined gas passages for preheat fuel and oxygen, and a copper outer sleeve. This configuration creates a skirt that protects the flame from being blown off the tip face, ensuring a stable and consistent preheat even in windy conditions or during rapid piercing operations.

The exterior of the tip is finished with a durable chrome plating. In industrial metallurgy and maintenance, chrome plating on cutting tips serves a functional purpose beyond aesthetics; it provides a smooth surface that resists the adhesion of molten slag and spatter. This reduces the frequency of cleaning required and prolongs the life of the tip by preventing heat buildup caused by accumulated debris. The cutting oxygen bore is drilled to precise tolerances to maintain a laminar flow, resulting in clean, square cuts with minimal kerf width and slag drag.

Operators should ensure their torch equipment is rated for propane service and that the appropriate "F" grade hoses are used. The 106-4 tip requires specific pressure settings for optimal performance, typically involving slightly higher preheat oxygen pressures compared to acetylene tips to compensate for the different stoichiometric requirements of propane combustion.