Is the Tube connection with GW NPT, stainless steel, M739LF suitable for use with AISI 316 tubing at the specified allowable working pressures?

Yes. The Tube connection with GW NPT, stainless steel, M739LF is suitable for use with AISI 316 tubing at the specified allowable working pressures, provided the tubeâs outer diameter and wall thickness meet the allowable working pressure limits given in the attachment. The fitting type LET-LOKÂ® with internal NPT thread is designed for chemical, petrochemical, pharmaceutical, energy, nuclear power and process engineering applications and is specified as material AISI 316, matching the tubing material. Compatibility requires verifying the tube dimensions (OD and wall thickness) against the allowable working pressure chart; if the tube falls within the listed combinations that correspond to the required working pressure, the connection is appropriate. Ensure proper installation (tightening and sealing per manufacturer instructions) and that system temperature, medium, and pressure cycles do not exceed the rated limits.

Does the Tube connection with GW NPT, stainless steel, M739LF require special installation tools for AISI 316 tubing at the listed allowable working pressures?

Tube connection with GW NPT, stainless steel, M739LF does not require special installation tools beyond those normally used for LET-LOKÂ® metric tube fittings for AISI 316 tubing. Installation follows standard LET-LOKÂ® procedures (cut, deburr, insert tube, tighten nut to specified torque) appropriate for the tube outer diameter and wall thickness that determine the allowable working pressure. Use calibrated torque wrenches and proper tube preparation tools to ensure seal integrity at the listed pressures; no proprietary or additional special tools are specified.

Can the Tube connection with GW NPT, stainless steel, M739LF be used in nuclear power applications with AISI 316 tubing?

Yes. Tube connection with GW NPT, stainless steel, M739LF Format can be used in nuclear power applications with AISI 316 tubing, provided the following conditions are met: - The fitting (LET-LOKÂ® with internal NPT thread) and tubing are both AISI 316, matching material compatibility for typical nuclear power environments. - The allowable working pressure is verified for the specific tube outer diameter and wall thickness per the manufacturerâs pressure tables (attachment). Ensure the selected tube section meets or exceeds the required pressure rating for the intended service. - All relevant nuclear industry standards, codes and client-specific qualification requirements (e.g., seismic, radiation, thermal, corrosion, traceability, testing, and documentation) are satisfied. This includes material certifications (e.g., EN/ASME), non-destructive testing, hydrostatic or leak testing, and any required quality assurance controls. - Installation and assembly follow manufacturerâs instructions and qualified procedures to achieve proper sealing and mechanical integrity under nuclear operating conditions. - Compatibility with the specific nuclear plant environment (chemistry, temperature, pressure, neutron/radiation exposure, and service media) is confirmed. If all the above are confirmed, the Tube connection with GW NPT, stainless steel, M739LF Format used with AISI 316 tubing is appropriate for nuclear power applications.

Fitting tube with NPT female thread, steel stainless, M739LF

All products, LET-LOK precision connectors/

Additional information

Material	SS – stainless steel

Fitting tube metric type LET-LOK® with a thread internal NPT 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-LM739LF-03-04-SS	Fitting tube 3 mm, 1/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-04-04-SS	Fitting tube 4 mm, 1/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-06-02-SS	Fitting tube 6 mm, 1/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-06-04-SS	Fitting tube 6 mm, 1/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-06-06-SS	Fitting tube 6 mm, 3/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-06-08-SS	Fitting tube 6 mm, 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-08-02-SS	Fitting tube 8 mm, 1/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-08-04-SS	Fitting tube 8 mm, 1/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-08-08-SS	Fitting tube 8 mm, 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-10-04-SS	Fitting tube 10 mm, 1/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-10-06-SS	Fitting tube 10 mm, 3/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-10-08-SS	Fitting tube 10 mm, 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-12-04-SS	Fitting tube 12 mm, 1/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-12-06-SS	Fitting tube 12 mm, 3/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-12-08-SS	Fitting tube 12 mm, 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-16-06-SS	Fitting tube 16 mm, 3/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-16-08-SS	Fitting tube 16 mm, 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-20-08-SS	Fitting tube 20 mm, 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-20-12-SS	Fitting tube 20 mm, 3/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-25-12-SS	Fitting tube 25 mm, 3/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM739LF-25-16-SS	Fitting tube 25 mm, 1" NPT female, SS	-	-	In stock	Enquiry

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Fitting tube metric type LET-LOK® with a thread internal NPT 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.