Ford Uni-Flange 1400 Series Wedge Action Joint 
Restraint for Ductile Iron Pipe Suggested Specification


Restraint for standardized mechanical joints shall be incorporated in the design of the follower gland
and shall impart multiple points of wedge action against the pipe, increasing its resistance as the
pressure increases.  The assembled joint shall maintain its flexibility after burial and shall maintain
its integrity by a controlled and limited expansion of each joint during the wedging action.  Restraining
gland shall be manufactured of high strength ductile iron conforming to the requirements of
ASTM A536, Grade 65-45-12.  Wedges shall be contoured to properly fit on the pipe, and shall be
manufactured of ductile iron, heat treated to a minimum hardness of 370 BHN.  Dimensions of the
glands shall be such that they can be used with the standardized mechanical joint bell and tee head
bolts conforming to the requirements of ANSI/AWWA C111/A21.11 and ANSI/AWWA C153/A21.53
of latest revision.  Twist off nuts shall be incorporated in the design of the wedge actuating screws to
ensure proper torque.  The mechanical joint restaining device shall have a water working pressure
rating of 250 psi minimum with a safety factor of at least 2:1 against separation when tested in a
dead-end situation, and shall be Uni-Flange Series 1400 or approved equal.