Is the Metric tube nut, brass, M761L compatible with all metric tubing sizes and pressure ratings for LET-LOKÂ® couplings?

No . the Metric tube nut, brass, M761L is intended for metric diameter tubing but is not automatically compatible with all metric tubing sizes and pressure ratings for LET-LOKÂ® couplings. Compatibility depends on matching the nut to the precise tubing diameter, wall thickness, and the specific LET-LOKÂ® ferrule and body designed for that tube size and the systemâs required pressure. Using the wrong size or a nut not rated for the assemblyâs pressure can lead to leaks or failure. Always verify the nutâs part number (M761L), the tubing nominal and actual outside diameter, and the manufacturerâs pressure and temperature ratings for the complete LET-LOKÂ® assembly before installation.

Can Metric tube nut, brass, M761L be used with different LET-LOKÂ® fitting materials (stainless steel, carbon steel) without galvanic corrosion?

Metric tube nut, brass, M761L is intended for use with LET-LOKÂ® fittings on metric tubing. Brass mated to stainless steel or carbon steel can present galvanic corrosion risk, especially in corrosive or wet environments. Stainless steel paired with brass is generally less problematic than carbon steel, but dissimilar-metal corrosion can still occur over time where electrolyte is present. For dry, indoor, non-corrosive service, M761L may perform acceptably with stainless or carbon steel fittings; for outdoor, humid, or chemically aggressive environments, use of compatible materials (matching metals, galvanic-isolated joints, or corrosion-resistant coatings) is recommended. For critical or long-term applications, consult manufacturer compatibility data or perform site-specific testing.

Does Metric tube nut, brass, M761L require specific tightening torque values for LET-LOKÂ® metric tubing?

No. Metric tube nut, brass, M761L does not require unique or special tightening torque values beyond standard practice for LET-LOKÂ® metric tubing fittings. As a brass nut intended for LET-LOKÂ® metric-diameter tubing, torque should be applied following the LET-LOKÂ® fitting and tubing manufacturerâs general recommendations: tighten to a hand-tight engagement plus the specified number of wrench flats or turns recommended for the fitting size, or to the torque values provided in the LET-LOKÂ® installation chart for the corresponding tubing diameter and material. If no specific torque chart is supplied for M761L, use typical LET-LOKÂ® assembly procedureâensure proper tube end preparation, insert tube fully into the coupling, hand-tighten the nut, then apply the recommended additional wrench turns (or torque) for the tubing size to achieve proper compression without over-tightening. Always verify against the official LET-LOKÂ® documentation or supplier instructions for critical applications.