Brass Reducing Bushes
A brass reducing bush is a brass fitting with a male-threaded large end and a female-threaded small end that reduces the size at the port of a fitting, valve or device.
It is used at tee and manifold outlets and to connect small-bore pipe or instruments to device ports. 39 sizes from 1/4″ × 1/8″ to 4″ × 3″ are available.
Main Applications
- Reducing tee and manifold outlets
- Connecting instruments to device ports
- Small-bore pipe to valve ports
- Combi boiler and water heater connections
- Compressed air equipment inlets
- Tank and vessel ports
Technical Data
| Fitting type | Reducing bush (male-female) |
|---|---|
| Thread | Large end male, small end female; G or R (depending on model) |
| Size range | 1/4″ × 1/8″ – 4″ × 3″, 39 sizes (product range) |
| Material | Brass CW617N (similar manufacturer sheet; depending on model) |
| Nominal pressure | PN16 (similar manufacturer sheet) |
| Max. working temperature | 160 °C (similar manufacturer sheet) |
| Surface | Natural brass |
| Example sizes | 1/2″ × 1/4″, 3/4″ × 1/2″, 1 1/4″ × 1″, 2″ × 1 1/2″ (product range) |
| Female-female transition | With a brass reducing socket |
| Male-male transition | With a brass reducing nipple |
| Production | Machined from bar (depending on model) |
| Media | Water, heating water, compressed air |
Material Options
| Part | Brass | Nickel-plated brass | Stainless (AISI 304) |
|---|---|---|---|
| Body | Brass CW617N (depending on model) | Brass body, nickel plated (depending on model) | AISI 304 stainless steel |
| Surface | Natural brass | Nickel plating | Uncoated stainless |
| Thread | Male + female, G / R (depending on model) | Depending on model | ISO 7-1 |
| Pressure rating | PN16, max. 160 °C (similar manufacturer sheet) | Depending on model | 20 bar −20…+38 °C (ISO 4144) |
| Suitable media | Domestic water, heating water, compressed air | Visible fixture connections | Food, chemicals, seawater |
Which material? A reducing bush should be chosen in the same material as the brass part it screws into; on stainless or galvanized ports a bush of the same material is preferred.
Advantages
Shortest Size Transition
- Screws directly into the port, no intermediate piece
Wide Choice
- 39 size combinations
Suited to Instruments
- Small 1/8″ and 1/4″ ends
Brass Compatibility
- Same material as brass valves and fittings
Construction and Design Features
- Male thread on the large end, female thread on the small end
- Hexagonal wrench head (depending on model)
- Brass body machined from bar
- Screwed installation without welding
Send the male large and female small size and the quantity; we will confirm the suitable brass reducing bush from stock.
How to Choose?
- Measure the port sizeDetermine the female thread size of the port the bush screws into.
- Determine the small endMeasure the male thread size of the pipe or device to connect.
- Choose the right fittingUse a reducing socket if both sides are female, a reducing nipple if both are male.
- Write the sizeUse the order large × small when ordering.
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Why ORFA?
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