G690-2 - Miller Smith G690-2 Replacement 90-Degree Head for MC Series Cutting Attachments

Technical Overview of the Miller G690-2 Cutting Attachment Head

The Miller G690-2 is a specialized replacement component designed for the head assembly of Miller and Smith Equipment MC Series cutting attachments. This unit features a standard 90-degree angle configuration, which is the industry standard for most manual cutting operations, providing optimal ergonomics and visibility for the operator during general fabrication and demolition tasks. The head is precision-machined from high-quality brass, ensuring excellent thermal conductivity and resistance to deformation under the high-heat conditions inherent in oxy-fuel cutting processes.

As a critical component of the oxy-fuel system, the G690-2 head is responsible for the secure seating of the cutting tip. The internal geometry is engineered to mate perfectly with MC-style cutting tips, ensuring a gas-tight seal that prevents backfires and flashbacks caused by leaking gases at the tip seat. The integrity of the head's seating surfaces is paramount for maintaining a stable preheat flame and a focused cutting oxygen stream. This replacement part allows maintenance personnel to refurbish existing cutting attachments where the threads or seating surfaces of the original head have become damaged or worn over time, extending the service life of the tool.

The "Ac, Mc" designation in the product nomenclature indicates its compatibility within the Acetylene and Medium Duty (MC) product lines. While the head itself is constructed to handle the thermal dynamics of oxy-acetylene cutting, it is also compatible with alternate fuel gases such as propane, propylene, and natural gas, provided the appropriate cutting tip is installed. This versatility makes the G690-2 a vital spare part for workshops utilizing the Smith/Miller Medium Duty oxy-fuel platform. Installation requires the removal of the old head assembly from the stainless steel tubes of the cutting attachment and brazing or threading the new head in place, depending on the specific assembly method of the parent attachment.

Engineered to meet strict OEM specifications, this head restores the original performance characteristics of the cutting attachment. It supports the efficient mixing of gases (in the case of tip-mix systems) or the safe delivery of pre-mixed gases to the tip. By utilizing genuine Miller replacement parts, operators ensure compliance with safety standards and maintain the warranty and reliability of their welding and cutting equipment.