CustomPartNet
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July 23, 2026
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Updated July 23, 2026
Choosing the right supplier starts with matching their equipment and material experience to your part's requirements. Certifications, minimum order quantities, and location all factor into total project cost and timeline. Sample parts are worth consideration, especially for connector parts that need to mate with other components reliably. A supplier's past work is living proof that they can manufacture similar parts, as opposed to a list of spec numbers on some paper. Browse the supplier network to the right to compare qualified manufacturers, view sample parts, and request quotes.
Plastic pellets are loaded through a hopper and fed into a heated barrel. Inside the barrel, a rotating screw pushes the material forward while heat and friction melt it into a uniform liquid.
Once enough melted plastic has built up at the front of the barrel, the screw switches from rotation to ramming, forcing the material through a nozzle and into the mold. The screw holds the injected material under pressure so that it fills the cavity completely, and cooling channels built into the mold help the part solidify quickly.
After the part is cold enough to hold its shape, the mold opens and an ejection system pushes the finished piece free. The mold closes again and the cycle starts over, often in under a minute for small to mid-sized parts.
This speed and repeatability make injection molding well suited to parts that need to hold tight dimensions across large production runs. This is exactly what connector manufacturing needs, since every connector produced needs to be able to mate with other parts on the assembly line.
PBT (Polybutylene Terephthalate) is a workhorse material in the electrical and electronics industry, and connectors are one of its biggest applications. It's specified for a few key reasons:
High dielectric strength, meaning reliable electrical insulation
Strong resistance to heat, so parts hold their shape near hot components or under prolonged sun exposure
Low moisture absorption, helping it retain dimensional accuracy over time, especially out in the elements
Good chemical resistance to oils, greases, and cleaning agents
Excellent flow characteristics when injection molding, useful for thin-walled or intricate connector housings
Available in flame-retardant grades that meet UL94 ratings
Can be reinforced with glass fiber for added stiffness and dimensional stability
Connector housings are typically small parts, but that doesn't mean the tooling is simple. Because connectors often carry many pins, cavities, and mating features, mold design has to account for a few specific challenges:
Thin walls that still need to fill completely and consistently
Multiple small pin cavities or core pins that are prone to wear
Tight tolerances to maintain proper pin alignment and mating fit
Glass-filled PBT grades that are more abrasive on tooling steel, often requiring hardened cavities
High cavitation molds to keep per-part costs down at production volume
Careful gate placement to avoid warping in thin-walled sections
Because glass-reinforced PBT flows less easily than unfilled resin, mold makers often need to adjust gate size and venting to avoid short shots or burn marks.
PBT injection molding is used across the electrical and electronics supply chain to produce:
Board-to-board connectors
Wire-to-board connectors
Automotive wiring harness connectors
Terminal blocks
Circuit breaker housings
Switch and relay components
Sensor housings
Fiber optic connector bodies
Texas suppliers serve a large base of electronics manufacturers, including automotive wiring harness producers and industrial equipment makers, supported by the state's strong presence in semiconductor and electronics manufacturing.
PBT offers a strong combination of electrical insulation, heat resistance, and dimensional stability at a reasonable cost. Its low moisture absorption also means parts keep their tolerances better than nylon in humid or variable conditions.
Tooling costs generally run from $5,000 to $80,000 or more, depending on cavity count, part complexity, and tolerance requirements. Per-part costs depend on part size, glass fiber content, and cycle time.
Not always. Unfilled PBT works for many general-purpose connectors, but glass-reinforced grades are common when parts need extra stiffness or must resist warping under heat.
Typical tolerances fall between ±0.003" and ±0.015", though this depends on part geometry, wall thickness, and glass fiber content. Tighter tolerances on pin alignment features may require additional process validation.
Yes. UL94 V-0 rated PBT grades are widely used in connector and electrical component applications where flammability standards apply.
Many Texas molders support the full range, from prototyping and DFM review through tooling, production, and secondary operations like insert molding, ultrasonic welding, or plating.
Injection molding is most cost-effective at medium-to-high volumes since tooling costs get spread across more parts. Connector programs commonly run from tens of thousands to millions of units annually.
Get competitive quotes from Texas injection molding suppliers experienced with PBT connector components. Upload a CAD file, drawing, or product concept and receive quotes from qualified suppliers matched to your project requirements.
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