SC50-3 - Smith SC50 Series Size 3 Heavy-Duty Propane Cutting Tip

Smith SC50-3 Heavy-Duty Cutting Tip Overview

The Smith SC50-3 is a premium Size 3 cutting tip engineered specifically for heavy-duty applications using alternate fuels such as propane and natural gas. As part of the SC50 Series, this tip features a robust two-piece construction, consisting of a brass inner splined member and a copper outer shell. This design is critical for stabilizing the flame characteristics of slower-burning fuel gases, allowing for efficient heat transfer and cutting performance. The SC50-3 is rated for cutting mild steel with a thickness of up to 2 inches (51 mm), making it a versatile choice for fabrication shops, scrap yards, and industrial maintenance.

One of the defining technical features of the SC50-3 is its "Heavy Preheat" classification. This design provides a high volume of preheat flame, which is essential for rapid starting on plate, especially when the surface is covered in rust, scale, or primer. The tip requires a cutting oxygen flow rate of approximately 170-180 SCFH, with preheat oxygen requirements ranging from 70-75 SCFH depending on the fuel gas used (Propane or Natural Gas). The propane flow rate is optimized at around 16 SCFH, while natural gas requires approximately 40 SCFH. Operators must ensure their gas supply system, particularly when using liquid oxygen, can sustain these volumes to prevent starvation and ensure cut quality.

Durability and safety are engineered into the physical geometry of the tip. The end is concave, a feature that significantly reduces the risk of backfire and helps the tip resist flameout during operation. Furthermore, the tip seat is designed to be protected from nicking, which is a common cause of leaks and seating issues in lesser quality tips. The fully swaged smooth bore ensures laminar gas flow, which translates to a tighter cutting stream, faster starts, and minimized slag accumulation on the finished cut. This tip is compatible with a wide range of Smith Equipment apparatus, including DG200 and SC200 cutting attachments, as well as all SC and DG series hand torches.