Hammer unions, also known as wing unions, are used for quick make-up and break-out of high-pressure flowlines. Sizes cover 1 in to 5 in, with CWP ratings from 1,000 psi (7 MPa) to 20,000 psi (140 MPa). Threaded, butt-weld and TBG-end configurations are available, including material configurations selected for the specified sour-service environment; Fig, size, CWP, seal profile and mating dimensions must all match.
1. Product Overview
Hammer unions are used for service-line connections in cementing, fracturing, acidizing, testing, plugging, kill lines, high-pressure manifolds, and truck-mounted systems.
High-pressure hammer unions include threaded unions and weld unions. Specifications cover 1 in to 5 in, with cold working pressure from 1,000 psi (7 MPa) to 20,000 psi (140 MPa).
Products have clear connection type and pressure-rating markings for field identification and safe matching.
For sour service, wetted and pressure-containing metallic materials are selected in accordance with NACE MR0175/ISO 15156 for the specified H2S partial pressure, pH, chloride concentration and temperature.
2. Design Features
Spherical and 90-degree conical sealing interfaces are precision-machined to the specified profile. Pressure integrity depends on the correct Fig, material, seal, mating dimensions and make-up.
Critical LP and TBG threads are CNC-machined with dedicated tooling for the accuracy required in high-pressure sealing.
The replaceable seal ring establishes the pressure seal on the applicable Fig design; its material and condition must be verified before make-up.
Compatibility is determined by the Fig designation, nominal size, pressure rating, seal profile and approved mating dimensions; an API license does not by itself establish interchangeability.
3. Installation and Maintenance Notes
Before installation, inspect internal and external threads, sealing faces, and seal-ring condition. Make up the connection only after confirming there is no damage, cross-threading, or foreign matter.
Clean the threads and apply suitable thread compound before connection. Tighten according to field operating procedures and avoid hammering that may damage threads, connection features, or sealing faces.
After use, clean, inspect, and store products by category to prevent seal aging, thread damage, and corrosion from affecting reuse.
4. Common Connection Types for High-Pressure Unions
1. Threaded-End Hammer Union Connection Types and Main Technical Parameters
Hammer Union Fig 100
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
End Thread
Service
A
B
C
2" Fig 100, 1,000 psi
2″
1,000 psi
92
73
81
Fig 100
2″LP
Standard
3" Fig 100, 1,000 psi
3″
124
102
114
3″LP
Standard
4" Fig 100, 1,000 psi
4″
146
132
135
4″LP
Standard
Hammer Union Fig 200
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
End Thread
Service
A
B
C
1" Fig 200, 2,000 psi
1″
2,000 psi
66
40
50
Fig 200
1″LP
Standard
2" Fig 200, 2,000 psi
2″
90
74
76
2″LP
Standard
3" Fig 200, 2,000 psi
3″
115
104
102
3″LP
Standard
4" Fig 200, 2,000 psi
4″
127
130
119
4″LP
Standard
Hammer Union Fig 206
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
End Thread
Service
A
B
C
4" Fig 206, 2,000 psi
4″
2,000 psi
125
133
126
Fig 206
4″LP
Standard
Hammer Union Fig 211
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
End Thread
Service
A
B
C
3" Fig 211, 2,000 psi
3″
2,000 psi
114
103
110
Fig 211
3″LP
Standard
Hammer Union Fig 400
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
End Thread
Service
A
B
C
1" Fig 400, 4,000 psi
1″
4,000 psi
83.5
44
110
Fig 400
1″LP
Standard
3" Fig 400, 4,000 psi
3″
159
107
110
3″LP
Standard
Hammer Union Fig 602
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
End Thread
Service
A
B
C
1" Fig 602, 6,000 psi
1″
6,000 psi
88
45
63
Fig 602
1.5″LP
Standard
2" Fig 602, 6,000 psi
2″
132.6
76.2
88
2″LP
2" Fig 602 TBG, 6,000 psi
2 3/8 ″TBG
3" Fig 602, 6,000 psi
3″
159
108
108
3″LP
3" Fig 602 TBG, 6,000 psi
3 1/2 ″TBG
4" Fig 602, 6,000 psi
4″
202
133
126.5
4″LP
1.5" Fig 602 NACE, 6,000 psi
1.5″
6,000 psi
113
67
78
1.5″LP
H2S
2" Fig 602 NACE, 6,000 psi
2″
132.6
76.2
88
2″LP
3" Fig 602 NACE, 6,000 psi
3″
159
108
108
3″LP
Hammer Union Fig 1002
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
End Thread
Service
A
B
C
1.5" Fig 1002, 10,000 psi
1.5″
10,000 psi
113
67
78
Fig 1002
1.5″LP
Standard
2" Fig 1002, 10,000 psi
2″
132.6
76.2
88
2″LP
2" Fig 1002 TBG, 10,000 psi
146
76.2
88
2 3/8 ″TBG
3" Fig 1002, 10,000 psi
3″
159
108
108
3″LP
3" Fig 1002 TBG, 10,000 psi
3 1/2 ″TBG
4" Fig 1002, 10,000 psi
4″
202
133
126.5
4″LP
1.5" Fig 1002 NACE, 7,500 psi
1.5″
7,500 psi
113
67
78
1.5″LP
H2S
2" Fig 1002 NACE, 7,500 psi
2″
132.6
76.2
88
2″LP
3" Fig 1002 NACE, 7,500 psi
3″
159
108
108
3″LP
4" Fig 1002 NACE, 7,500 psi
4″
202
133
126.5
4″LP
Hammer Union Fig 1003
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
End Thread
Service
A
B
C
4" Fig 1003, 10,000 psi
4″
10,000 psi
140
103
140.5
Fig 1003
4″LP
Standard
Hammer Union Fig 1502
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
End Thread
Service
A
B
C
1" Fig 1502, 15,000 psi
1″
15,000 psi
111
55
73
Fig 1502
1″LP
Standard
1.5" Fig 1502, 15,000 psi
1.5″
117
76.2
88.53
1.5″LP
2" Fig 1502, 15,000 psi
2″
177
81.5
92
2″LP
2" Fig 1502 TBG, 15,000 psi
177
81.5
92
2 3/8 ″TBG
3" Fig 1502, 15,000 psi
3″
194
114.3
113
3″LP
3" Fig 1502 TBG, 15,000 psi
231
114.3
113
3 1/2 ″TBG
4" Fig 1502, 15,000 psi
4″
217
146
151
4″LP
2" Fig 1502 NACE, 10,000 psi
2″
10,000 psi
177
81.5
92
2″LP
H2S
3" Fig 1502 NACE, 10,000 psi
3″
194
114.3
113
3″LP
3" Fig 1502 NACE TBG, 10,000 psi
3″
231
114.3
113
3 1/2 ″TBG
2. Butt-Weld Union Connection Types and Main Technical Parameters
Butt-Weld Union Fig 200
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
Service
A
B
C
2" Fig 200 Butt-Weld, 2,000 psi
2″
2,000 psi
94.3
60.3
74.6
Fig 200
Standard
3" Fig 200 Butt-Weld, 2,000 psi
3″
117
89
99
4" Fig 200 Butt-Weld, 2,000 psi
4″
145
114
126.5
Butt-Weld Union Fig 602
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
Service
A
B
C
2" Fig 602 Butt-Weld, 6,000 psi
2″
6,000 psi
126
60.3
92.2
Fig 602
Standard
2" Fig 602 Butt-Weld, 6,000 psi
124
60.3
2" Fig 602 Butt-Weld, 6,000 psi
126
76.2
3" Fig 602 Butt-Weld, 6,000 psi
3″
133
108
108
3" Fig 602 Butt-Weld, 6,000 psi
134
89
114.3
3" Fig 602 Butt-Weld, 6,000 psi
144
89
4" Fig 602 Butt-Weld, 6,000 psi
4″
154
114.3
127
2" Fig 602 NACE Butt-Weld, 6,000 psi
2″
126
60.3
92.2
H2S
3" Fig 602 NACE Butt-Weld, 6,000 psi
3″
138.2
89
114.3
4" Fig 602 NACE Butt-Weld, 6,000 psi
4″
144.5
114.3
127
Butt-Weld Union Fig 1002
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
Service
A
B
C
2" Fig 1002 Butt-Weld, 10,000 psi
2″
10,000 psi
128
60.3
92.2
Fig 1002
Standard
3" Fig 1002 Butt-Weld, 10,000 psi
3″
136.7
89
114.3
4" Fig 1002 Butt-Weld, 10,000 psi
4″
154
114.3
127
5" Fig 1002 Butt-Weld, 7,500 psi
5″
7,500 psi
221
141
160
2" Fig 1002 NACE Butt-Weld, 7,500 psi
2″
126
60.3
92.2
H2S
3" Fig 1002 NACE Butt-Weld, 7,500 psi
3″
138.2
89
114.3
4" Fig 1002 NACE Butt-Weld, 7,500 psi
4″
144.5
114.3
127
Butt-Weld Union Fig 1003
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
Service
A
B
C
4" Fig 1003 Butt-Weld, 10,000 psi
4″
10,000 psi
220
140
135
Fig 1003
Standard
Butt-Weld Union Fig 1502
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
Service
A
B
C
2" Fig 1502 Butt-Weld, 15,000 psi
2″
15,000 psi
130
60.3
102
Fig 1502
Standard
2" Fig 1502 Butt-Weld, 15,000 psi
2″
130
83
102
3" Fig 1502 Butt-Weld, 15,000 psi
3″
143.5
89
124
2" Fig 1502 NACE Butt-Weld, 10,000 psi
2″
10,000 psi
101.6
60.3
101.6
H2S
4" Fig 1502 NACE Butt-Weld, 10,000 psi
4″
130
89
124
Butt-Weld Union Fig 2002
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
Service
A
B
C
2" Fig 2002 Butt-Weld, 20,000 psi
2″
20,000 psi
158.5
74.5
92.35
Fig 2002
Standard
3" Fig 2002 Butt-Weld, 20,000 psi
3″
265
143
150
Butt-Weld Union Fig 2202
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
Service
A
B
C
2" Fig 2202 NACE Butt-Weld, 15,000 psi
2″
15,000 psi
187
60.3
95
Fig 2202
H2S
3" Fig 2202 NACE Butt-Weld, 15,000 psi
3″
222
88.9
125
4" Fig 2202 NACE Butt-Weld, 15,000 psi
4″
217
140
157
3. Metric Trapezoidal-Thread Hammer Union Connection Types and Main Technical Parameters
Metric Trapezoidal-Thread Hammer Union
Model
Nominal Size
Cold Working Pressure
Overall Dimensions (mm)
Connection Type
End Thread
Service
A
B
C
2" Tr99×12.7 TBG, 10,000 psi
2″
10,000 psi
126.5
78
92
Tr99×12.7
2 3/8TBG
Standard
3" Tr100×12 TBG, 10,000 psi
3″
160
75
92
Tr100×12
2 3/8TBG
4. Metric Trapezoidal-Thread Butt-Weld Union Connection Types and Main Technical Parameters
