ABOUT HAMMER WING UNIONS
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How to Identify a Male and/or Female Half
Oil Field Figure Number 602, 1002, 1502, 2002, or 2202 Hammer Wing Union
"How can I make certain I know which
Hammer Union Half to call male, and which to call female?"
For communication about separate union halves
that will avoid mistake, describe the male half as “The half with
the nut,” and describe the female half as “The half with the
external thread.” See illustration below.
WOODCO USA intends the image above to resolve any
confusion in communication that might occur when specifying
equipment that may have a male or female, 602, 1002, 1502, or 2202
hammer union half as a connector.
Since the female half has an external thread
commonly recognized as a male thread, while the male half has a nut
with an internal thread commonly recognized as a female thread,
mistakes often occur in describing male and female halves of hammer
The terms male and female apply to the design of
union sealing surfaces. The nose of the male union half fits into
the inward taper of the female union half. The nut secured to the
male union half screws onto the external threads of the female union
half to achieve connection of the two halves, and striking the wings
of the nut with a hammer provides the force to tighten the
connection to achieve a seal.
Firm intimate contact of the male union half nose
with the taper of the female union half provides a primary metal to
metal seal. For popular unions used in the oil field, a secondary
elastomeric seal serves as a
backup to the primary seal.
No greater hazard exists
with oilfield pressure control equipment than mismatched hammer
wing unions. Union manufacturers and user groups have posted various warnings
about this problem online. You can find these warnings by an
internet search for "warnings about joining 2" 602, 1002, and 1502
This problem will not occur if operators positively identify
these unions and avoid any attempt to join them inappropriately.
To aid in positive identification of these unions,
and avoid any possibility of union mismatch, WOODCO USA has
available, union identification tools for 2" Fig.
602 / 1002 unions, and 2"
1502 unions (2" Fig. 602 and 2" Fig. 1002 unions have
identical dimensions). To find out more about
these tools, click here.
here to view the WOODCO USA Catalog for Pressure Control Equipment.
Click here for
more information about current efforts to create an API Standard for
Figure # Hammer Unions.
Information above, and in other parts of this Web Site, may help persons who really seek to know. If you have a question, and you think WOODCO USA may have the capacity to answer it, please use our Contact Us link and give us a chance to help.
WOODCO USA provides Web Site Tools for identification, estimating, and reference only. Do not use this information for manufacturing or inspection. Users of these tools should not use them as a substitute for professional engineering advice. Anyone making use of the information presented does so at his own risk and assumes any and all liability resulting from such use.
FOR FURTHER INFORMATION, OR TO LEARN MORE ABOUT WOODCOUSA PRODUCTS AND SERVICES,
P.O. Box 1261
Houston, Texas 77251-1261
USA and Canada: 1-800-496-6326