Is the 90° NPT Male to Metric Tube Elbow, Stainless Steel, M769L compatible with all metric tubing sizes and NPT thread types?

The 90° NPT Male to Metric Tube Elbow, Stainless Steel, M769L is not universally compatible with all metric tubing sizes and all NPT thread types. It is specifically engineered for use with metric tubing and external NPT male threads, but compatibility depends on selecting the correct combination of metric tube OD/metric ferrule size and the matching NPT thread size/type. Key points: - Metric tubing compatibility: Designed for metric tubing but you must choose the fitting size that matches the specific metric outer diameter and corresponding ferrule size; not every metric tube OD will fit a given M769L size. - NPT thread compatibility: The fitting uses external NPT male threads; it must be paired with the appropriate NPT female port size and thread type (tapered NPT). Variations in thread size (e.g., 1/8", 1/4", 3/8", etc.) require the corresponding M769L variant. - Performance limits: Permissible working pressure and sealing performance depend on the chosen size and thread type; ensure the selected configuration meets your pressure and application requirements. - Material and environment: AISI 316 stainless steel offers excellent corrosion and chemical resistance, suitable for demanding industries, but proper sizing and thread matching remain essential for leak-tight, reliable connections. In summary: M769L supports metric tubing and NPT male threads, but you must match the specific metric tube size and NPT thread size/type—it's not a one-size-fits-all fitting.

Can the 90° NPT Male to Metric Tube Elbow, Stainless Steel, M769L be used in high-temperature or cryogenic environments without special modification?

The 90° NPT Male to Metric Tube Elbow, Stainless Steel, M769L, made from AISI 316 stainless steel, offers excellent corrosion and chemical resistance and is built for demanding, high‑pressure industrial environments. These material and construction attributes make it generally suitable for use across a wide temperature range, including elevated and low (cryogenic) temperatures, without requiring special modification in many applications. However, suitability for specific high‑temperature or cryogenic service depends on several factors not specified here: exact service temperature, pressure at that temperature, compatibility of connected materials (tubing, seals, threads), and any thermal cycling or shock conditions. AISI 316 retains good strength and corrosion resistance at moderately high temperatures and remains ductile at low temperatures, but maximum allowable working pressure and sealing performance can change with temperature. Threaded NPT connections and sealing methods may also require attention for cryogenic service (differential contraction) or very high temperatures (creep, gasket/seat materials). Recommendation: confirm your exact temperature and pressure range, media, and connection details with the manufacturer’s temperature/pressure ratings and materials data. For extreme high‑temperature or true cryogenic applications, request manufacturer guidance or select fittings and sealing methods specifically rated and tested for those conditions.

Fitting 90° with a male NPT 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 thread external NPT for a metric tube Intended mainly for industry chemical, petrochemical, pharmaceutical, power generation, nuclear power plants and process engineering. The permissible pressure working fittings specifies 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 thread external NPT for a metric tube Intended mainly for industry chemical, petrochemical, pharmaceutical, power generation, nuclear power plants and process engineering. The permissible pressure working fittings specifies on the basis of a given size and type connections threaded (details in the attachment). Material: steel AISI 316.