SP Waterproof Connectors: Sourcing SP13–SP21 from China
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SP connectors (SP13, SP17, SP21) are threaded waterproof circular connectors widely cloned in China, rated to IP67 or IP68 depending on series and mating. They're the cheaper cousin of the GX aviation-style range and show up in LED lighting, outdoor sensors, and e-bike wiring. The catch: many sellers market plastic-shell SP21 parts as 'aviation connectors,' and unmated or improperly torqued housings drop well below their stated IP rating.
When sourcing SP connectors, confirm the shell material (nylon vs metal), current rating per pin, and whether the IP67/IP68 claim is tested mated or as a bare housing. The common pitfall is assuming all SP21 parts are interchangeable — pin counts and keying vary between factories.
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FAQ
What's the difference between SP and GX connectors?
GX (GX12/GX16/GX20) are metal-shell aviation-style connectors; SP (SP13/SP17/SP21) are typically plastic-shell and lower cost. Both target IP67/IP68 waterproofing but GX generally handles higher current and rougher environments.
Are Chinese SP21 connectors really IP68?
Only when correctly mated and torqued — the rating applies to the assembled pair, not a loose housing. Ask the supplier for the test condition behind the IP claim and verify with a sample dunk test on receipt.
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