Is Metric tube fitting for welding, stainless steel, M768LN suitable for use with AISI 316 tubes at specified allowable working pressures?

Yes. Metric tube fitting for welding, stainless steel, M768LN is suitable for use with AISI 316 tubes at the specified allowable working pressures, provided the tube outer diameter and wall thickness match the values used to determine the fittingâs allowable working pressure (see attachment). The fitting itself is made of AISI 316 stainless steel and is intended for demanding industries (chemical, petrochemical, pharmaceutical, energy, nuclear power, process engineering), so material compatibility and corrosion resistance are appropriate. Ensure selection of tube dimensions that correspond to the allowable working pressure table in the documentation and verify system design conditions (temperature, media, joint preparation and welding procedure, and applicable safety factors) to confirm safe operation.

Can Metric tube fitting for welding, stainless steel, M768LN be used with AISI 316 tubes across the full range of allowable working pressures?

Yes. Metric tube fitting for welding, stainless steel, M768LN can be used with AISI 316 tubes across the full range of allowable working pressures provided that the tube outer diameter and wall thickness fall within the specified limits given for the fitting. The allowable working pressure of the fitting is set based on tube OD and wall thickness (see attachment); since the fitting material is AISI 316, it is compatible with AISI 316 tubes and will meet the pressure ratings for any tube dimensions that match the fittingâs specified allowable working-pressure range.

Does Metric tube fitting for welding, stainless steel, M768LN require specific tube end preparation for AISI 316 tubes?

Does Metric tube fitting for welding, stainless steel, M768LN require specific tube end preparation for AISI 316 tubes? Yes. Metric tube fitting for welding, stainless steel, M768LN is a welded LET-LOKÂ® type fitting intended for critical industries where proper joint integrity is essential. For AISI 316 tubes, correct tube end preparation is required to ensure a reliable weld, consistent sealing, and to meet the allowable working pressure specified by tube diameter and wall thickness. Typical preparation steps include: - Cutting the tube square and to correct length (90Â° to tube axis) with no burrs. - Removing burrs and sharp edges from the inside and outside of the tube end. - Cleaning the tube contact area to remove oil, grease, oxides or contaminants (solvent cleaning or pickling as appropriate). - Ensuring proper alignment and concentricity with the fitting to avoid stress concentrators. - Following any specified bevel or chamfer if the installation or welding procedure calls for a particular weld profile (consult welding procedure or manufacturer guidance). - Using welding procedures compatible with AISI 316 (correct filler metal, shielding gas and parameters) to preserve corrosion resistance and mechanical properties. Always follow the manufacturerâs installation instructions and applicable welding standards for LET-LOKÂ® welded fittings and AISI 316 stainless steel to achieve rated performance and compliance.

Fitting for a metric tube for welding-on, steel stainless, M768LN

All products, LET-LOK precision connectors/

Additional information

Material	SS – stainless steel

Fitting for a metric tube for welding-on type LET-LOK® intended mainly for the chemical, petrochemical and pharmaceutical industry, power generation, nuclear power plants and process engineering. The permissible working pressure is determined on the basis of the outer diameter and the wall thickness of the tube (details in the attachment). Material: steel AISI 316.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HM-LM768LN-03-02-SS	Fitting for a tube 3 mm for welding-on 1/8", SS	-	-	In stock	Enquiry
HM-LM768LN-04-02-SS	Fitting for a tube 4 mm for welding-on 1/8", SS	-	-	In stock	Enquiry
HM-LM768LN-06-02-SS	Fitting for a tube 6 mm for welding-on 1/8", SS	-	-	In stock	Enquiry
HM-LM768LN-06-04-SS	Fitting for a tube 6 mm for welding-on 1/4", SS	-	-	In stock	Enquiry
HM-LM768LN-08-02-SS	Fitting for a tube 8 mm for welding-on 1/8", SS	-	-	In stock	Enquiry
HM-LM768LN-08-04-SS	Fitting for a tube 8 mm for welding-on 1/4", SS	-	-	In stock	Enquiry
HM-LM768LN-08-08-SS	Fitting for a tube 8 mm for welding-on 1/2", SS	-	-	In stock	Enquiry
HM-LM768LN-10-04-SS	Fitting for a tube 10 mm for welding-on 1/4", SS	-	-	In stock	Enquiry
HM-LM768LN-10-06-SS	Fitting for a tube 10 mm for welding-on 3/8", SS	-	-	In stock	Enquiry
HM-LM768LN-10-08-SS	Fitting for a tube 10 mm for welding-on 1/2", SS	-	-	In stock	Enquiry
HM-LM768LN-12-04-SS	Fitting for a tube 12 mm for welding-on 1/4", SS	-	-	In stock	Enquiry
HM-LM768LN-12-06-SS	Fitting for a tube 12 mm for welding-on 3/8", SS	-	-	In stock	Enquiry
HM-LM768LN-12-08-SS	Fitting for a tube 12 mm for welding-on 1/2", SS	-	-	In stock	Enquiry
HM-LM768LN-12-12-SS	Fitting for a tube 12 mm for welding-on 3/4", SS	-	-	In stock	Enquiry
HM-LM768LN-14-06-SS	Fitting for a tube 14 mm for welding-on 3/8", SS	-	-	In stock	Enquiry
HM-LM768LN-15-08-SS	Fitting for a tube 15 mm for welding-on 1/2", SS	-	-	In stock	Enquiry
HM-LM768LN-16-08-SS	Fitting for a tube 16 mm for welding-on 1/2", SS	-	-	In stock	Enquiry
HM-LM768LN-18-08-SS	Fitting for a tube 18 mm for welding-on 1/2", SS	-	-	In stock	Enquiry
HM-LM768LN-20-08-SS	Fitting for a tube 20 mm for welding-on 1/2", SS	-	-	In stock	Enquiry
HM-LM768LN-22-12-SS	Fitting for a tube 22 mm for welding-on 3/4", SS	-	-	In stock	Enquiry
HM-LM768LN-25-12-SS	Fitting for a tube 25 mm for welding-on 3/4", SS	-	-	In stock	Enquiry
HM-LM768LN-25-16-SS	Fitting for a tube 25 mm for welding-on 1", SS	-	-	In stock	Enquiry

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Fitting for a metric tube for welding-on type LET-LOK® intended mainly for the chemical, petrochemical and pharmaceutical industry, power generation, nuclear power plants and process engineering. The permissible working pressure is determined on the basis of the outer diameter and the wall thickness of the tube (details in the attachment). Material: steel AISI 316.