Is the allowable working pressure for the 90Â° connection with NPT GZ for metric tube, stainless steel, M769L the same across all thread sizes and how is it determined?

The allowable working pressure for the 90Â° connection with NPT GZ for metric tube, stainless steel, M769L is not the same across all thread sizes. It is determined for each specific thread size and connection type; pressure ratings depend on the geometric dimensions and mechanical strength of the particular threaded size (see attachment for detailed values). Material (AISI 316) and fitting design (LET-LOKÂ® with external NPT thread for metric tubing) set baseline corrosion and strength properties, but the final allowable working pressure is taken from size-specific tables or calculations for the threaded connection shown in the manufacturerâs documentation. Always use the pressure rating listed for the exact thread size and configuration of the M769L 90Â° connection.

Does the allowable working pressure for the 90Â° connection with NPT GZ for metric tube, stainless steel, M769L vary by thread size and how is it calculated?

Yes - the allowable working pressure for the 90Â° connection with NPT GZ for metric tube, stainless steel, M769L varies by thread size. It is calculated from the specific threaded-connection dimensions and strength limits for each size: the nominal thread (NPT) diameter, wall thickness of the fitting and mating part, engagement length, and the material allowable stress for AISI 316 under the applicable design code. The attachment with detailed tables gives the pressure ratings per thread size based on those geometric parameters and AISI 316 material properties; therefore you must use the size-specific table values or apply the same calculation method (structural stress vs. internal pressure formula) for the required thread size to obtain the allowable working pressure.

How is the allowable working pressure for the 90Â° connection with NPT GZ for metric tube, stainless steel, M769L specified for each thread size?

The allowable working pressure for the 90Â° connection with NPT GZ for metric tube, stainless steel, M769L is specified per thread size according to the manufacturerâs LET-LOKÂ® data for external NPT threads on metric tubing. For each thread size the allowable working pressure (AWP) is given as a numerical pressure rating (typically in bar or MPa) tied to that specific NPT thread designation and the fitting material (AISI 316). The AWP values account for the mechanical strength of the AISI 316 body, the thread geometry and engagement of the external NPT (GZ) connection, and the sealing/ferrule performance with the metric tube. To obtain the exact AWP for each thread size you must consult the detailed table in the LET-LOKÂ® attachment referenced (the product datasheet), which lists each NPT thread size (e.g., 1/8â³ NPT, 1/4â³ NPT, 3/8â³ NPT, 1/2â³ NPT, etc.) alongside its corresponding allowable working pressure. The attachment also clarifies units, test conditions (temperature), and any de-rating factors for elevated temperatures or specific media.

Fitting 90° with NPT male thread for a metric tube, steel stainless, M769L

All products, LET-LOK precision connectors/

Additional information

Material	SS – stainless steel

Fitting 90° type LET-LOK® with a thread external 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 fittings is determined on the basis of a given size and type connections threaded (details in the attachment). Material: steel AISI 316.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HM-LM769L-03-02-SS	Fitting 90° for a tube 3 mm, 1/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-03-04-SS	Fitting 90° for a tube 3 mm, 1/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-04-02-SS	Fitting 90° for a tube 4 mm, 1/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-04-04-SS	Fitting 90° for a tube 4 mm, 1/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-06-02-SS	Fitting 90° for a tube 6 mm, 1/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-06-04-SS	Fitting 90° for a tube 6 mm, 1/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-06-06-SS	Fitting 90° for a tube 6 mm, 3/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-06-08-SS	Fitting 90° for a tube 6 mm, 1/2" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-08-02-SS	Fitting 90° for a tube 8 mm, 1/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-08-04-SS	Fitting 90° for a tube 8 mm, 1/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-08-06-SS	Fitting 90° for a tube 8 mm, 3/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-08-08-SS	Fitting 90° for a tube 8 mm, 1/2" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-10-02-SS	Fitting 90° for a tube 10 mm, 1/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-10-04-SS	Fitting 90° for a tube 10 mm, 1/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-10-06-SS	Fitting 90° for a tube 10 mm, 3/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-10-08-SS	Fitting 90° for a tube 10 mm, 1/2" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-12-02-SS	Fitting 90° for a tube 12 mm, 1/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-12-04-SS	Fitting 90° for a tube 12 mm, 1/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-12-06-SS	Fitting 90° for a tube 12 mm, 3/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-12-08-SS	Fitting 90° for a tube 12 mm, 1/2" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-12-12-SS	Fitting 90° for a tube 12 mm, 3/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-14-06-SS	Fitting 90° for a tube 14 mm, 3/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-14-08-SS	Fitting 90° for a tube 14 mm, 1/2" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-15-08-SS	Fitting 90° for a tube 15 mm, 1/2" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-16-06-SS	Fitting 90° for a tube 16 mm, 3/8" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-16-08-SS	Fitting 90° for a tube 16 mm, 1/2" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-16-12-SS	Fitting 90° for a tube 16 mm, 3/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-18-08-SS	Fitting 90° for a tube 18 mm, 1/2" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-18-12-SS	Fitting 90° for a tube 18 mm, 3/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-20-08-SS	Fitting 90° for a tube 20 mm, 1/2" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-20-12-SS	Fitting 90° for a tube 20 mm, 3/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-22-12-SS	Fitting 90° for a tube 22 mm, 3/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-22-16-SS	Fitting 90° for a tube 22 mm, 1" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-25-12-SS	Fitting 90° for a tube 25 mm, 3/4" NPT male, SS	-	-	In stock	Enquiry
HM-LM769L-25-16-SS	Fitting 90° for a tube 25 mm, 1" NPT male, SS	-	-	In stock	Enquiry

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Fitting 90° type LET-LOK® with a thread external 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 fittings is determined on the basis of a given size and type connections threaded (details in the attachment). Material: steel AISI 316.