Can Straight reduction fitting for metric tubing, stainless steel, M763L be used with tubing of different materials at the same allowable pressure?

No. Straight reduction fitting for metric tubing, stainless steel, M763L is rated for allowable working pressure based on the outer diameter and wall thickness of the tubing and the fitting material (AISI 316). Using tubing of a different material with the same nominal dimensions does not guarantee the same allowable pressure, because different materials have different mechanical properties (yield strength, tensile strength, corrosion resistance, permissible stress at temperature). Therefore you must verify the alternate tubing materialâs allowable working pressure for the specific OD and wall thickness (and operating temperature and media) and ensure compatibility with AISI 316 fittings. If the alternate materialâs pressure rating equals or exceeds the value given for the specified OD and wall thickness (per the attachment/data), and fittings, seals and joint design are compatible, substitution may be acceptable only after engineering confirmation.

Straight reduction fitting for metric tubing, stainless steel, M763L

Q: What is the maximum allowable working pressure for the Straight reduction fitting for metric tubing, stainless steel, M763L based on tubing OD and wall thickness?

The maximum allowable working pressure for the Straight reduction fitting for metric tubing, stainless steel, M763L depends on the tubing outer diameter (OD) and wall thickness. For each metric OD, select the tubing wall thickness and consult the manufacturerâs allowable working pressure chart (given in the product datasheet/attachment). Typical practice for AISI 316 metric tubing in LET-LOKÂ® straight reducing fittings yields higher allowable pressures for smaller ODs and thicker walls; conversely, larger ODs and thinner walls reduce the allowable pressure. Because the specific numeric values are provided in the attachment chart, the exact maximum allowable working pressure for a given tubing size must be read directly from that chart corresponding to the tubing OD and wall thickness combination.

Q: How do I determine the allowable working pressure for the Straight reduction fitting for metric tubing, stainless steel, M763L when using different tubing wall thicknesses?

To determine the allowable working pressure for the Straight reduction fitting for metric tubing, stainless steel, M763L, use the tubing outer diameter (OD) and actual wall thickness: consult the manufacturerâs pressure chart (attachment) that lists allowable pressures by OD and wall thickness for AISI 316 tubing. For each tubing size, find the matching OD row and the column corresponding to your wall thickness; the intersecting value is the allowable working pressure for that configuration. If your wall thickness falls between chart values, interpolate conservatively (use the lower pressure). Ensure tubing material is AISI 316 and installation follows LET-LOKÂ® assembly instructions; for temperatures or special fluids apply appropriate correction factors per the chart or standards. If in doubt, contact the supplier with OD and exact wall thickness for confirmation.

All products, LET-LOK precision connectors/

Additional information

Material	SS – stainless steel

Straight reducing fitting type LET-LOK® for metric tubing intended mainly for the chemical, petrochemical, pharmaceutical, energy, nuclear power, and process engineering industries. The allowable working pressure is determined based on the outer diameter and wall thickness of the tubing (details in the attachment). Material: AISI 316 steel.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HM-LM763L-06-02-SS	Reduction fitting for a tube 6 mm x 2 mm, SS	-	-	In stock	Enquiry
HM-LM763L-06-03-SS	Reduction fitting for a tube 6 mm x 3 mm, SS	-	-	In stock	Enquiry
HM-LM763L-06-04-SS	Reduction fitting for tube 6 mm x 4 mm, SS	-	-	In stock	Enquiry
HM-LM763L-08-06-SS	Reducer fitting for 8 mm x 6 mm tubing, SS	-	-	In stock	Enquiry
HM-LM763L-10-06-SS	Reduction fitting for tube 10 mm x 6 mm, SS	-	-	In stock	Enquiry
HM-LM763L-10-08-SS	Reducing connector for tube 10 mm x 8 mm, SS	-	-	In stock	Enquiry
HM-LM763L-12-06-SS	Reduction fitting for tube 12 mm x 6 mm, SS	-	-	In stock	Enquiry
HM-LM763L-12-08-SS	Reducing fitting for tube 12 mm x 8 mm, SS	-	-	In stock	Enquiry
HM-LM763L-12-10-SS	Reduction fitting for tube 12 mm x 10 mm, SS	-	-	In stock	Enquiry
HM-LM763L-14-08-SS	Reduction fitting for tube 14 mm x 8 mm, SS	-	-	In stock	Enquiry
HM-LM763L-14-10-SS	Reduction fitting for a tube 14 mm x 10 mm, SS	-	-	In stock	Enquiry
HM-LM763L-14-12-SS	Reduction fitting for tube 14 mm x 12 mm, SS	-	-	In stock	Enquiry
HM-LM763L-15-10-SS	Reducer fitting for a tube 15 mm x 10 mm, SS	-	-	In stock	Enquiry
HM-LM763L-15-12-SS	Reduction fitting for pipe 15 mm x 12 mm, SS	-	-	In stock	Enquiry
HM-LM763L-16-10-SS	Reducer fitting for a tube 16 mm x 10 mm, SS	-	-	In stock	Enquiry
HM-LM763L-16-12-SS	Reducer fitting for a tube 16 mm x 12 mm, SS	-	-	In stock	Enquiry
HM-LM763L-18-12-SS	Reducer fitting for tube 18 mm x 12 mm, SS	-	-	In stock	Enquiry
HM-LM763L-18-16-SS	Reduction fitting for tube 18 mm x 16 mm, SS	-	-	In stock	Enquiry
HM-LM763L-20-12-SS	Reduction fitting for tube 20 mm x 12 mm, SS	-	-	In stock	Enquiry
HM-LM763L-20-16-SS	Reduction fitting for pipe 20 mm x 16 mm, SS	-	-	In stock	Enquiry
HM-LM763L-22-16-SS	Reducer fitting for pipe 22 mm x 16 mm, SS	-	-	In stock	Enquiry
HM-LM763L-25-12-SS	Reducer fitting for pipe 25 mm x 12 mm, SS	-	-	In stock	Enquiry
HM-LM763L-25-16-SS	Reducer fitting for pipe 25 mm x 16 mm, SS	-	-	In stock	Enquiry
HM-LM763L-25-18-SS	Reducer fitting for tube 25 mm x 18 mm, SS	-	-	In stock	Enquiry
HM-LM763L-25-20-SS	Reducer fitting for pipe 25 mm x 20 mm, SS	-	-	In stock	Enquiry

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Straight reducing fitting type LET-LOK® for metric tubing intended mainly for the chemical, petrochemical, pharmaceutical, energy, nuclear power, and process engineering industries. The allowable working pressure is determined based on the outer diameter and wall thickness of the tubing (details in the attachment). Material: AISI 316 steel.