Figure 50 Hammer Union — Threaded and Socket Weld, 500 psi
Figure 50 hammer union, standard service, threaded and socket weld ends. 4" to 5", rated 500 psi (35 bar). Full size table with weights and dimensions on this page.
Key features
- Figure Number: 50
- Union Type: Union
- End Connection: Threaded and socket weld
- Service Class: Standard service
- Working Pressure: 500 psi
- Nominal Size Range: 4" to 5"
- Seal Arrangement: O-ring.
- Figure Number
- 50
- Union Type
- Union
- End Connection
- Threaded and socket weld
- Service Class
- Standard service
- Working Pressure
- 500 psi
- Nominal Size Range
- 4" to 5"
Product description
The Figure 50 is the suction and low-pressure union in the hammer lug family, built in steel throughout and available with threaded or socket weld ends in 4 in and 5 in.
Applications
Suction lines and low-pressure line connections.
Construction and sealing
- Steel construction throughout, threaded or socket weld ends.
- One nut and one O-ring serve both the 4 in and the 5 in size.
- Male and female blanking caps are available for the same connection.
- Sealing: O-ring.
- Material: Steel.
The figure number is the rating: Figure 50 is designed to hold 500 psi cold working pressure.
Working pressure
500 psi (35 bar) cold working pressure. The figure number is the rating.
How a hammer union makes up
A hammer union is a three-piece connection. A male sub and a female sub carry the two line ends, and a wing nut turns on a thread cut into the male sub and pulls a shoulder on the female sub down onto the seat. The lugs standing proud of the nut are struck with a hammer to tighten it, which is where the name comes from — the joint is made up and broken out with a sledgehammer rather than a wrench, so a line can be rigged and stripped quickly in the field. The seal is made by the seat, not by the thread: the nut only supplies the load that holds the two seating faces together. That is why a union will leak from a scored seat or a perished seal long before the thread is at fault, and why a worn union is usually a sub or a seal replacement rather than a scrap part.
Specifying one
Four things fix a hammer union: the figure number, which sets the pressure class and decides what it will mate with; the service class, standard or sour gas; the end connection, threaded or butt weld; and the nominal size. Figure numbers are an industry series, so a union of the same figure and size from another maker will mate — but the pressure rating stamped on the union is what governs, not the figure number on its own. Send us the line specification and we will confirm the match before quoting.
Sizes and part numbers
Published in 4" to 5" with threaded and socket weld ends. Every orderable size, its weight, its dimensions and its working pressure are in the size table on this page. Where dimensions and weight are critical, ask us to confirm them against the build before you order.
Identification
| Parameter | Value |
|---|---|
| Figure Number | 50 |
| Union Type | Union |
| End Connection | Threaded and socket weld |
Performance
| Parameter | Value |
|---|---|
| Service Class | Standard service |
| Working Pressure | 500 psi |
| Working Pressure | 35 bar |
Dimensions
| Parameter | Value |
|---|---|
| Nominal Size Range | 4" to 5" |
Sealing
| Parameter | Value |
|---|---|
| Seal Arrangement | O-ring. |
Construction
| Parameter | Value |
|---|---|
| Body Material | Steel. |
Shipping & lead time
Sizes & part numbers
4 sizes| Indus part no. | Nominal size | End connection | A (mm) | B (mm) | Weight (g) | Working pressure (bar) |
|---|---|---|---|---|---|---|
| IH-HU-50-THD-STD-0400 | 4" | 4" LP thread | 130.3 | 152.4 | 12400 | 35 |
| IH-HU-50-THD-STD-0500 | 5" | 5" LP thread | 130.3 | 142.7 | 9900 | 35 |
| IH-HU-50-SW-STD-0400 | 4" | 4" socket weld | 130.3 | 103.1 | 11700 | 35 |
| IH-HU-50-SW-STD-0500 | 5" | 5" socket weld | 130.3 | 103.1 | 9300 | 35 |
A — Dimension A on the manufacturer dimension drawing. B — Dimension B on the manufacturer dimension drawing. Ask us for the dimension drawing if you need it stamped.
Working pressure is the manufacturer’s published rating for the fitting itself. An assembly is limited by its lowest-rated component, so check it against the hose, the tube and the port you are mating to.
What is the working pressure of a Figure 50 hammer union?▾
What sizes does the Figure 50 come in?▾
How does a Figure 50 union seal?▾
Is there a sour gas version of the Figure 50?▾
What is included in a hammer union?▾
Shipped worldwide from our Dubai warehouse. Transit, routes and documentation for 126 destinations
The same part, in the designations used across European and Gulf trade catalogues.
- de
- Hammerverschraubung Verschraubung
- fr
- union à marteau union
- es
- unión de martillo unión
- it
- giunto a martello giunto
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