Moulding in thread-inserts into a rotational moulded plastic part, is a common practice and is vital for producing multifunctional plastic parts. While such thread-inserts could be easily held with a simple screw inside the mould - the time and labour needed to screw and unscrew the
inserts would negatively influence the cycle-times and production cost.
With a “Snap-Sert” we offer a much more efficient and comfortable system to fix the thread-inserts inside the mould cavity. The Standard Snap-Sert utilizes a spring loaded ball to securely clamp the plugged-on insert inside the mould. During the moulding process, plastic will build-up around the insert and will form a strong connection to the plastic part.
Being located in demoulding direction the insert will automatically be pulled off the Snap-Sert when demoulding the plastic part. In combination with a „push-bar-clamp” or “Helix” assembly the Snap-Sert can also be applied to areas that aren’t in demoulding direction. The retraction systems will be used to pull out the Snap-Sert before demoulding the plastic part, so the thread insert is released from the fixing pin.
The Standard Snap Sert is made of Stainless Steel and is available for fixing M4, M5, M6, M8, M10 and M12 inserts.
NOTE: For a secure and tight fixing with the Standard-Snap-Sert, the core or bore hole of the thread-inserts must apply to tolerance H7. (This relatively close tolerance results in higher priced inserts. For using less expensive inserts a Double-Snap-Sert is available)
The „Double-Snap-Serts“ features two holding balls instead of just one and is also manufactured in Stainless Steel. With these two balls, the Double-Snap-Sert permits the application of inexpensive thread-inserts with a wider tolerance (like they are i.e. used in the furniture industry). The Double-Snap-Serts are available for fixing M5, M6, M8 or M10 inserts.
With the „Hot-Sert“ system we can offer you another special solution. This variation features
also two holding balls but the threaded shaft is manufactured in a copper-beryllium alloy. This alloy has a very fast heat transfer which results in an extensive plastic build-up around the thread-insert. Very helpful for applications in which the thread-inserts are located in mould
areas that are hard to heat up or applications where the moulded-in inserts have to withstand
big torque forces. The Hot-Serts are available for fixing M5, M6 or M8 inserts.
