Choosing the wrong cutting nozzle is one of the most common \u2014 and costly \u2014 mistakes in fiber laser operations. The wrong bore diameter causes poor cut quality; the wrong thread wastes time and risks head damage. This guide covers the fundamentals.<\/p>\n
Single-layer nozzles (like our D28 Single Layer, M11) are the standard choice for most cutting applications \u2014 mild steel, stainless steel, and aluminium up to around 10mm. They provide a clean, focused gas flow and are available in bore diameters from 1.0mm to 4.0mm.<\/p>\n
Double-layer nozzles<\/strong> add an inner precision tip that creates a more concentrated gas stream. This matters on thick plate (12mm+) where you need the gas to punch through the melt more aggressively, and on materials where dross is a persistent problem. The tradeoff: double-layer nozzles are slightly more expensive per unit and more sensitive to contamination.<\/p>\nBore Diameter Selection<\/h2>\n
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\n Material Thickness<\/th>\n Recommended Bore<\/th>\n Assist Gas<\/th>\n<\/tr>\n \n 1 \u2013 3mm<\/td>\n 1.0 \u2013 1.5mm<\/td>\n N\u2082 or O\u2082<\/td>\n<\/tr>\n \n 3 \u2013 8mm<\/td>\n 1.5 \u2013 2.0mm<\/td>\n N\u2082 or O\u2082<\/td>\n<\/tr>\n \n 8 \u2013 16mm<\/td>\n 2.0 \u2013 2.5mm<\/td>\n O\u2082 (steel) \/ N\u2082 (SS)<\/td>\n<\/tr>\n \n 16mm+<\/td>\n 2.5 \u2013 4.0mm<\/td>\n O\u2082 or high-pressure N\u2082<\/td>\n<\/tr>\n<\/table>\n Thread Compatibility<\/h2>\n