Expandable Cavities

The Expandable Cavity was developed for molding undercuts such as threads,dimples,and protrusions on the outside of the piece part.
The patented X-Cav design eliminates the endineering,maintenance,and machining required for side action mechanisms which allows for smaller molds or higher mold cavitation.

"A"Series:
 • Forms all of the molded detail
 • Requires striker insert in "A"Side of mold
 • Gating position must be from top

"B"Series:
 • Forms details such as bosses and posts with barbs
 • Allows all motion to be in the "B"Side of mold
 • Gating position allows for a conventional runner

Contact Engineering for a full design review and quote.

Expandable Cavities mold undercuts such as threads,
dimples, and protrusions.
The patented Ex-Cav design eliminates the engineering,
maintenance, and machining required for side action
mechanisms which results in smaller molds or highermold cavitation.

Technical Information:
• Four sizes offered to satisfy a wide range of parts.
• • The Ex-Cav expands along a conical shape, 10˚ per side.
• • Manufactured from A-2, 54-57 HRC material for repeatable expansion.
For optimal performance, the Ex-Cavs should ride against a hardened
insert.
• • Maximum temperature: 260˚C / 500˚ F
• • Expandable Cavities are capable of operating without lubrication.
However, treating the Ex-Cav with an additional coating for wear
reduction or corrosion resistance is beneficial.
• • Ex-Cavs can be ordered with molding detail for a ‘mold ready’
component.
• • Fixturing bushings for machining details in house are also available.
• • Custom Ex-Cavs are available. Also, when an entire part is formed
within the cavity, an A-Series Ex-Cav can be provided, shown at left.