Is the 90° Brass Elbow Fitting for Metric Tubing, M765L compatible with stainless steel tubing and what are the pressure limits for different OD/wall thicknesses?

Yes. The 90° Brass Elbow Fitting for Metric Tubing, M765L is compatible with stainless steel tubing: its LET-LOK® brass construction is designed to form secure, leak‑tight connections with metal tubing, including stainless steel, when the correct metric OD and wall thickness are used. Allowable working pressure is determined by the tubing outer diameter (OD) and wall thickness; higher wall thicknesses and smaller ODs yield higher pressure ratings. Exact pressure limits must be taken from the tubing pressure charts or manufacturer tables for the specific stainless steel tube material and dimensions used, but in practice the fitting supports typical process pressures encountered in chemical, petrochemical, pharmaceutical and energy applications when paired with appropriately rated stainless steel metric tubing. For a precise pressure rating for a given OD/wall thickness, consult the tubing manufacturer’s allowable working pressure data or the fitting supplier’s technical tables.

Can the 90° Brass Elbow Fitting for Metric Tubing, M765L be used with aggressive chemicals or high-temperature fluids, and how do temperature and media affect its allowable working pressure?

The 90° Brass Elbow Fitting for Metric Tubing, M765L is made of high‑quality brass and offers good general corrosion resistance and durability, making it suitable for many industrial applications (chemical processing, petrochemicals, pharmaceuticals, energy, nuclear power, etc.). However, its compatibility with aggressive chemicals and high‑temperature fluids is limited by the material properties of brass and must be evaluated case‑by‑case. Strong acids, alkalis, ammonia, chloride‑bearing media and some organic solvents can cause dezincification, stress corrosion or accelerated corrosion of brass; elevated temperatures typically accelerate these effects and may degrade sealing components. For aggressive or high‑temperature media, verify chemical compatibility of brass and any elastomers used, or consider alternative materials (e.g., stainless steel, special alloys). Allowable working pressure for the 90° Brass Elbow Fitting for Metric Tubing, M765L is determined primarily by the tubing’s outer diameter and wall thickness. Temperature and the media in contact affect allowable working pressure: as temperature rises or as corrosive/weakening media attack the fitting or tubing, the safe working pressure decreases. Always consult manufacturer pressure‑temperature charts and chemical compatibility data for the specific tubing and fitting materials, apply appropriate safety factors, and follow applicable codes/standards when sizing for high temperature or aggressive media.

Coupling 90° for a metric tube, brass, M765L

All products, LET-LOK precision connectors/

Additional information

Material	B – brass (bronze)

A LET-LOK® 90° fitting for a metric tube Intended mainly for industry chemical, petrochemical, pharmaceutical, power generation, nuclear power plants and process engineering. The permissible pressure working specifies on the basis of diameter outer and wall thickness wall tubes (details in the attachment). Material: brass.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Price	Quantity	Actions	Catalogue
HM-LM765L-06-B	Fitting 90° for a tube 6 mm, brass	-	-	In stock	0 €		Enquiry

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A LET-LOK® 90° fitting for a metric tube Intended mainly for industry chemical, petrochemical, pharmaceutical, power generation, nuclear power plants and process engineering. The permissible pressure working specifies on the basis of diameter outer and wall thickness wall tubes (details in the attachment). Material: brass.