figure 101 hammer union

FIGURE 101 HAMMER UNION - Butt Weld



Nominal pipe Size: 5"
Pressure Rating: 1,000 psi cwp; 1,500 psi test
Connections Type: pipeline thread, tubing thread, butt-weld
Component Parts: Nut, Male Sub, Female Sub, Seal Ring

Sour Service Models to NACE MR-01-75

Recommended service
Manifold and line connection.

Hammer Union (Series 101 - Butt Weld) Features
Pressure-tight make-up with hammer
Economical, low-pressure union


Hammer Unions are high-pressure threaded or welded connections with two halves a threaded female half and a wing male half with swivel nut that fit together and seal upon turning and then hammering the nut half together with the threaded half. Weco-style hammer unions come in sizes from 1" up to 10" and in pressures from 1,000 psi up to 15,000 psi. These type of hammer unions are commonly used in oilfield and industrial applications to seal two pieces of pipe or hose together by making a connection via threads or welds.

Hammer unions are color coded to specific pressure ratings for example a figure 1502 is red and blue nut and is rated for 15,000 psi where as a figure 100 is yellow with black nut and rated for 1,000 psi. Please see below chart for complete pressure rating and color codes for each high presure hammer union availible.