Male brass solder coupling – threaded copper pipe fitting

The male brass solder coupling is a two-ended transition fitting : on one side a smooth female solder socket that slides over a copper pipe, on the other a male end threaded to the gas standard. It provides a clean transition from a brazed copper line to a threaded connection : valve, tap, manifold, nipple or cast iron fitting of the same diameter. In solid brass, it suits both plumbing and industrial- or vintage-style decorative creations, where its warm golden hue is sought after.

Technical specifications

• Type: mixed solder coupling — female solder socket + male threaded end
• Material: brass
• Solder end: capillary brazing fitting for copper pipes, compliant with the NF EN 1254-1 standard
• Threaded end: parallel « G » male thread to the gas standard per ISO 228-1 (BSPP, Gas series)
• Applications: cold water, hot water, heating, air conditioning, gas, compressed air
• Assembly: by soft soldering (tin) or hard brazing (silver/copper rod) onto the copper pipe, depending on the fluid (see « Installation ») ; screwed onto the thread

Permissible pressure and temperature

The maximum working pressure depends on the filler metal used for the assembly and on the fluid temperature. Indicative values from the manufacturer :

Ø = pipe diameter in mm. Intermediate pressures are obtained by interpolation.

Installation: for water intended for human consumption, lead/tin filler (type I) is prohibited : use a lead-free filler — tin/copper or tin/silver (types II/III). For combustible gas, favour capillary hard brazing (types IV/V/VI) ; soft tin soldering is not permitted there.

Available sizes

Each coupling pairs a gas thread (3/8″ to 1″1/2) with a copper pipe diameter to braze (Ø 10 to 42 mm). The millimetre designation (12/17, 15/21, 20/27…) corresponds to the French naming of gas threads.

What is this coupling for?

In plumbing, the male solder coupling makes the junction between a copper pipe network and a threaded element. The female socket is brazed onto the copper pipe end, while the male end screws into a gas tapping of the same diameter : valve inlet, meter connection, manifold, tap or cast iron fitting. It thus avoids threading the copper directly and ensures a removable connection on the threaded side.

In industrial decoration, this brass fitting serves as a connecting or finishing element on pipe builds : transition from copper pipe to a threaded assembly of a lamp, clothes rail or piece of furniture. Its golden brass hue, which patinas nicely over time, complements vintage and workshop-style creations.

Installation tips

• Deburr and clean the copper pipe as well as the inside of the socket before assembly.
• Apply a suitable flux, then heat evenly ; the solder or braze is drawn by capillary action into the socket clearance.
• Screw in the male end, sealing the thread with a packing suited to the fluid (hemp + paste or PTFE tape).
• Let it cool before pressurising ; respect the pressure/temperature limits of the filler metal used.

Compatibility

The male thread to the ISO 228-1 gas standard is compatible with female gas tappings and malleable cast iron fittings of the same diameter. On the pipe side, choose the socket diameter matching your copper : for example a copper pipe Ø 22 mm with a 3/4″ thread (3/4″ × Ø 22 coupling).

Deco idea: candle holder from plumbing fittings

The solder socket in Ø 22 mm almost exactly matches the diameter of a standard taper candle (long candle). The Ø 22 version of the coupling then becomes the ideal receptacle for a handmade candle holder built from plumbing pipes and fittings : screwed onto the top of a brass or steel build, the socket holds the candle directly for industrial and workshop-style decoration.