Is the LET-LOKÂ® Tee fitting for metric tubing, brass, M764L compatible with AISI 316 steel tubing and rated for the specified allowable working pressures?

Yes. The Tee fitting for metric tubing, brass, M764L is designed for metric tubing but the product description specifies material AISI 316 steel and states allowable working pressure is determined by the tubing outer diameter and wall thickness (see attachment). Therefore, when used with AISI 316 steel tubing of the appropriate outer diameter and wall thickness that meet the pressure table, the Tee fitting for metric tubing, brass, M764L is compatible and can be rated for the specified allowable working pressures. Ensure you verify the exact tubing OD/wall thickness against the allowable working pressure table in the attachment and confirm any application-specific approvals (e.g., chemical, nuclear) before installation.

Can Tee fitting for metric tubing, brass, M764L be used with AISI 316 steel tubing in chemical and nuclear applications at the rated working pressures?

Yes. Tee fitting for metric tubing, brass, M764L can be used with AISI 316 steel tubing in chemical and nuclear applications at the rated working pressures provided that: the tubing is AISI 316 with outer diameter and wall thickness matching the allowable working pressure table for the fitting; system operating conditions (pressure, temperature, media, corrosion potential, radiation) do not exceed the combined limits of the brass fitting and AISI 316 tubing; compatibility of brass with the specific chemical environment and nuclear service is confirmed (avoid dezincification or other brass degradation in aggressive media); proper installation and tightening per LETâLOKÂ® instructions are followed. If any doubt about corrosion, radiation effects, or higher temperatures exists, consult the manufacturer or a materials engineer for confirmation.

Does Tee fitting for metric tubing, brass, M764L meet corrosion resistance required when paired with AISI 316 tubing?

Tee fitting for metric tubing, brass, M764L does not meet the corrosion resistance of AISI 316 tubing. Although the LET-LOKÂ® type tee fitting for metric tubing is intended for demanding industries (chemical, petrochemical, pharmaceutical, energy, nuclear and process engineering), the M764L is made of brass while the tubing is AISI 316 stainless steel. Brass is more susceptible to dezincification, stress corrosion cracking in certain environments, and general galvanic corrosion when coupled with higher-grade stainless steels in aggressive media. Pairing brass fittings with AISI 316 tubing can create a galvanic couple, accelerating corrosion of the less noble material (brass) under wet or conductive conditions common in process and chemical applications. If process conditions are benign (dry, non-corrosive fluids, compatible media, controlled temperatures) and the application has been assessed for galvanic compatibility, M764L brass fittings may be acceptable. However, for typical chemical, petrochemical, pharmaceutical, energy or nuclear service where corrosion resistance is critical, matching materials (AISI 316 fittings) or suitably corrosion-resistant alloys are recommended to ensure long-term integrity and compliance with industry expectations.

Coupling A tee for a metric tube, brass, M764L

All products, LET-LOK precision connectors/

Additional information

Material	B – brass (bronze)

A LET-LOK® tee fitting 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	Price	Quantity	Actions	Catalogue
HM-LM764L-06-B	Tee fitting for a tube 6 mm, brass	-	-	In stock	0 zł		Enquiry
HM-LM764L-08-B	Tee fitting for a tube 8 mm, brass	-	-	In stock	0 zł		Enquiry

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A LET-LOK® tee fitting 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.