MC-125 - Smith MC12-5 Medium Duty Acetylene Cutting Tip, Size 5

Precision Engineering for Heavy Cutting

The Smith MC12-5 Acetylene Cutting Tip represents the pinnacle of gas apparatus engineering for medium-duty applications. Designed to handle substantial material thicknesses up to 6 inches (152 mm), this tip utilizes advanced fluid dynamics to ensure a stable and potent cutting stream. The core of its performance lies in the swaged copper construction. Unlike drilled tips, the swaging process creates an internal bore with mirror-like smoothness. This reduction in surface roughness minimizes turbulence within the oxygen stream, maintaining laminar flow over greater distances. The result is a tighter, more cohesive cutting jet that penetrates deep into the workpiece while maintaining kerf quality and reducing slag adhesion.

Safety is paramount in the design of the MC12 series. This tip features Smith's renowned "In-Tip Mixing" technology. By keeping the oxygen and fuel gas separate until they reach the mixing chamber within the tip itself, the volume of mixed gas in the system is drastically reduced. This engineering choice significantly lowers the potential energy available in the event of a flashback, protecting both the operator and the upstream equipment. The tip requires specific flow rates for optimal performance: 249-267 SCFH for cutting oxygen, 14 SCFH for preheat oxygen, and 12 SCFH for acetylene. These precise specifications ensure that the exothermic reaction is sustained efficiently through the full 6-inch cut capacity.

Furthermore, the MC12-5 is designed with a concave face. This geometry serves a dual purpose: it protects the critical orifice edges from physical damage if the tip contacts the workpiece, and it creates a stagnation zone that helps stabilize the preheat flame, resisting flameout even under adverse conditions. The slip-in seat design utilizes a soft seating material that forms a gas-tight seal with hand pressure alone, eliminating the risk of thread galling common in high-heat environments.