Is the Straight fitting with GW NPT for metric tubing, stainless steel, M766L compatible with all AISI 316 tubing sizes and wall thicknesses for specified working pressures?

Short answer: No . not automatically. Explanation: The Straight fitting with GW NPT for metric tubing, stainless steel, M766L is made from AISI 316 and is designed for metric tubing, but its allowable working pressure depends on the specific outer diameter (OD) and wall thickness of each tube. Compatibility for the specified working pressures must be confirmed by comparing the tubeâs OD and wall thickness to the allowable working pressure tables or charts provided for the fitting (attachment). Only tubing sizes and wall thicknesses that meet or exceed those listed allowable pressures are acceptable. Therefore, you must verify each AISI 316 tube size and wall thickness against the M766L allowable working pressure data before declaring compatibility.

Can the Straight fitting with GW NPT for metric tubing, stainless steel, M766L be used with tubing materials other than AISI 316?

The Straight fitting with GW NPT for metric tubing, stainless steel, M766L is specified as made from AISI 316 and its allowable working pressure is defined based on the tubing outer diameter and wall thickness. If you intend to use tubing made from a different material, compatibility must be verified case-by-case: ensure the alternative material has equal or greater mechanical strength, corrosion resistance and temperature/chemical compatibility versus AISI 316, and that its actual outer diameter and wall thickness meet the pressure-rating tables referenced. Also confirm thread and sealing performance with the LET-LOKÂ® internal NPT design. If in doubt, consult the manufacturer or a qualified engineer for approval and re-rate the assembly before service.

Does the Straight fitting with GW NPT for metric tubing, stainless steel, M766L require specific installation torque values for different tube diameters?

Straight fitting with GW NPT for metric tubing, stainless steel, M766L does not explicitly require specific installation torque values tied to each tube diameter in the provided description. The product description states that allowable working pressure is determined by the tubing outer diameter and wall thickness (details in the attachment) and that the fitting is made of AISI 316 stainless steel for demanding industries. Torque specifications are not mentioned. However, correct installation typically depends on tube size, wall thickness, and fitting design; therefore, manufacturers commonly provide torque or tightening guidance in installation manuals, technical datasheets, or assembly instructions to ensure proper sealing without damaging the tubing or fitting. To be safe and achieve reliable joints for Straight fitting with GW NPT for metric tubing, stainless steel, M766L, use the manufacturerâs specific installation instructions or contact the supplier for recommended torque values for each tube diameter and wall thickness. If manufacturer data are unavailable, follow general best practices for tube fittings of this type: hand-tighten, then apply incremental wrench turns per the fittingâs published procedure, and perform leak and strength testing at the specified allowable working pressure.

Fitting straight with NPT female thread for a metric tube, steel stainless, M766L

All products, LET-LOK precision connectors/

Additional information

Material	SS – stainless steel

A LET-LOK® straight fitting in a thread internal NPT for a metric tube 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-LM766L-03-02-SS	Fitting for a tube 3 mm - 1/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-03-04-SS	Fitting for a tube 3 mm - 1/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-04-02-SS	Fitting for a tube 4 mm - 1/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-06-02-SS	Fitting for a tube 6 mm - 1/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-06-04-SS	Fitting for a tube 6 mm - 1/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-06-06-SS	Fitting for a tube 6 mm - 3/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-06-08-SS	Fitting for a tube 6 mm - 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-08-02-SS	Fitting for a tube 8 mm - 1/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-08-04-SS	Fitting for a tube 8 mm - 1/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-08-06-SS	Fitting for a tube 8 mm - 3/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-08-08-SS	Fitting for a tube 8 mm - 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-10-04-SS	Fitting for a tube 10 mm - 1/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-10-06-SS	Fitting for a tube 10 mm - 3/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-10-08-SS	Fitting for a tube 10 mm - 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-12-04-SS	Fitting for a tube 12 mm - 1/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-12-06-SS	Fitting for a tube 12 mm - 3/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-12-08-SS	Fitting for a tube 12 mm - 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-12-12-SS	Fitting for a tube 12 mm - 3/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-14-06-SS	Fitting for a tube 14 mm - 3/8" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-14-08-SS	Fitting for a tube 14 mm - 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-15-08-SS	Fitting for a tube 15 mm - 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-16-08-SS	Fitting for a tube 16 mm - 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-18-08-SS	Fitting for a tube 18 mm - 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-20-08-SS	Fitting for a tube 20 mm - 1/2" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-20-12-SS	Fitting for a tube 20 mm - 3/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-22-12-SS	Fitting for a tube 22 mm - 3/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-25-12-SS	Fitting for a tube 25 mm - 3/4" NPT female, SS	-	-	In stock	Enquiry
HM-LM766L-25-16-SS	Fitting for a tube 25 mm - 1" NPT female, SS	-	-	In stock	Enquiry

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A LET-LOK® straight fitting in a thread internal NPT for a metric tube 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.