Overmolding brass, steel or plastic inserts can be very challenging. Overmolded inserts are usually held in place by shutting off on each half of the cavity or core. Most of the time, there needs to be a preload of .002/in. – .005/in. to insure there is no leakage of plastic. If this is not done, the part could end up being scrap along with the inserts.
Other methods of preload must be used on inserts with open tolerances above +/-.003/in. One of the most common type of inserts that are used, are bushings with internal threads. These types of inserts must have precision shut-off to prevent plastic from leaking into the threads.
Overmolded inserts most typically have some type of knurl, holes or undercuts to prevent the insert from coming out or turning out of the finished part. In some cases, the overmolded inserts cannot be shut-off on both sides. An example of this type of situation is explained in the following case study.
Insert molding can be a highly efficient alternative to the assembly of discrete parts, reducing assembly and labor costs, and increasing design flexibility and part reliability. With decades of experience, Tri-Tec has proven expertise overmolding plastic, machined and sintered metals, and magnets.
Insert Overmolding plastic parts
P20,45#, 50#, H13, 718, 2738, NAK80, S136, SKD61 etc.
Hot Runner/Cold Runner
UG, PROE, CAD, CAXA ect.
PP, PC, PS, PE, PU, PVC, ABS, PMMA ect.
T/T,Paypal, western union
Depends on customer's requirements.
1)Express(fast,samples are suggested)
2)By air,(fatest,high expense)
3)By sea(large order,longer time,cheapest).
4)The standard shipping is 10-22 working days. The expedited shipping is 3-5 working days,.
5)All international orders may be subject to their custom fees or duty tax which we do not pay.
6)All buyers must pay for their own customs fees or brokerage fees or duty tax.
These fees vary due to price of item and government rate. Please contact your government website or shipping company to calculate fees.