3/8 in (10 mm) Black Male-Female Union, Bronze-Bronze Seat | SU10MFBB

This AAP black male-female union is a mild steel fitting with BSP threads. It is supplied in 9 sizes, 3/8 in (10 mm) to 3 in (80 mm).

A union joins two pipes with a joint that can be broken and made again without turning the pipework. This one is threaded outside (male) at one end and inside (female) at the other, with a ball to cone seat as AAP describes, so it screws straight into a female port. AAP lists steel unions for make-and-break joints on filters, valves, hoses, machinery and general piping that needs periodic disconnection (manufacturer-stated).

This one has a bronze-bronze seat. AAP describes bronze-bronze (BB) seats as recommended where corrosion from the fluid or condensation is a major factor and the union is disconnected constantly, and as well suited to steam lines (manufacturer-stated).

AAP states that its steel threaded pipe fittings are made to BS EN 10241:2000 (manufacturer-stated). It has a black finish. AAP states that unions up to 2 in nominal bore are each tested to 13.8 MPa and sample tested to 20.7 MPa, and unions over 2 in are each tested to 10.3 MPa (manufacturer-stated). These are test pressures, not working pressures, so confirm the pressure and temperature for your application with AIMS before you order.

Where this product is used

• Make-and-break joints on filters, valves, hoses and machinery
• Connecting a female threaded port to a female threaded pipe with a joint that can be taken apart
• General piping that needs periodic disconnection

Features

• 9 sizes, 3/8 in (10 mm) to 3 in (80 mm)
• Mild steel, black, BS EN 10241:2000 (manufacturer-stated)
• Bronze-Bronze seat
• BSP threads

Key specifications

Options and part numbers

A is the approximate overall length, B the nut across flats and C the body across flats, as lettered on the AAP drawing, in millimetres. AAP states the nut is hexagon up to 1 in and octagon from 1-1/4 in, and the body flats are octagon. Weights are approximate, in kilograms per piece.

Selecting the right option

Choose the size to match your pipework. These fittings are BSP threaded, so check that your pipe or fitting is BSP and not NPT before you order. AAP also lists a size (SU08MFBB) and the galvanised version (SU08MFBBG, SU10MFBBG, SU15MFBBG, SU20MFBBG, SU25MFBBG, SU32MFBBG, SU40MFBBG, SU50MFBBG, SU65MFBBG, SU80MFBBG) in this range, which AIMS does not currently list. Ask if you need one.

Related products

See also AAP Black Steel Male-Female Union, Steel-Steel Seat, AAP Black Steel Female Union, Bronze-Bronze Seat, AAP Black Steel Hexagon Nipple and AAP Black Steel Socket, Heavy Type.