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.

90° connection with NPT GZ for metric tube, stainless steel, M769L

Q: 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.

All products, LET-LOK precision connectors/

90° connection with NPT GZ for metric tube, stainless steel, M769L

Additional information

Material	SS – stainless steel

90° fitting type LET-LOK® with external NPT thread for metric tubing, primarily intended for the chemical, petrochemical, pharmaceutical, energy, nuclear power, and process engineering industries. The allowable working pressure of the fitting is determined based on the specific size and type of threaded connection (details in the attachment). Material: AISI 316 steel.

List of product variants

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

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90° fitting type LET-LOK® with external NPT thread for metric tubing, primarily intended for the chemical, petrochemical, pharmaceutical, energy, nuclear power, and process engineering industries. The allowable working pressure of the fitting is determined based on the specific size and type of threaded connection (details in the attachment). Material: AISI 316 steel.