Weipu Connector Alternative: SP/SL Cross-Reference

A Weipu connector alternative has to clear one test before any other: it must drop into the same panel hole and mate as a pair, because SP13, SP17 and SP21 name a 13 mm, 17 mm and 21 mm cutout that is an industry de-facto standard, not a Weipu patent. The closest match for most buyers is Verchil’s own SP/SL range — identical sizing and IP68 sealing, with lot-traceable QC and 24–48 h stock that distributor channels rarely offer on the same part.

This comparison scores every option on one set of dimensions: panel-cutout match, pin/current capacity, IP rating, lead time, and traceability. Weipu’s genuine parts sit in the table as the baseline you are replacing — not as a target to disparage. Where Verchil wins, it wins on supply and traceability, not on a claim that one plastic shell outperforms another.

One honest limit up front. “Drop-in” here means system-level: same cutout, same thread, same pin arrangement, so you swap the plug-and-socket pair. It does not promise that a third-party plug will mate with a Weipu socket already installed in your panel — Weipu’s own FAQ states cross-brand compatibility “cannot be guaranteed.” Replace both halves from one source and the uncertainty disappears.

Weipu SP Size → Alternative Cross-Reference (Quick Table)

The fastest filter is panel hole: match the millimetre and you have already eliminated every wrong-size part. SP13 needs a 13 mm hole, SP17 a 17 mm hole, and SP21 a 21 mm hole — and any compliant alternative must hit the same opening.

Weipu values per weipuconnector.com and distributor In2Connect; Verchil values per the Verchil SP size guide. Retrieved 2026-06-29. Current per contact falls as pin count rises; IP68 holds only when mated.

Is “SP” a Weipu Trademark? Why These Alternatives Are Legitimate

The worry behind most “alternative” searches is unspoken: am I about to buy a knock-off? It’s worth answering plainly. “SP” as used here describes a family of round, threaded, IP-sealed connectors built to widely shared cutout sizes — 13, 17, and 21 mm — that multiple manufacturers produce independently. Weipu is the best-known maker and arguably the reason the sizing is so common, but the 13/17/21 mm panel openings function as a de-facto industry standard, the same way M12 sensor connectors or XLR audio shells do. A connector built to that cutout by another factory isn’t a counterfeit of Weipu — it’s a different product to a shared dimension.

That distinction matters because it changes what you’re checking for. A counterfeit copies a brand’s markings to pass itself off as that brand; a legitimate alternative carries its own name and stands on its own test data. Verchil’s SP/SL is branded Verchil, documented by Verchil, and sold as Verchil — there’s no pretence that it is a Weipu part. The honest claim is narrower and stronger: it fits the same hole and does the same job, sourced as a matched pair with its own paperwork.

So the legitimacy test isn’t “does it say Weipu” — it’s the opposite. Be wary of an unbranded shell sold cheap with Weipu markings (that’s the actual counterfeit risk); trust a clearly-branded alternative that publishes its own cutout, current, IP, and lot data. The rest of this page treats every option that way: by its own evidence, against the genuine baseline, on the same five dimensions.

The Alternatives, Scored Against What Weipu Actually Gives You

Every option below is judged on the same five dimensions — cutout match, pin/current capacity, IP rating, lead time, and traceability — with genuine Weipu sitting in the table as the baseline you are replacing. The labels (Closest Match, Distribution Alternative, Adjacent Format) describe each option’s relationship to Weipu, not a verdict that it is universally better. Verchil earns its label on supply and traceability; it does not claim a plastic shell that out-performs the original.

Weipu SP/SL (genuine) — the baseline

This is the part you already specified, so it sets the bar. Weipu’s SP threaded range covers SP13/SP17/SP21 at 13/17/21 mm cutouts, IP68 when mated, across 2–12 poles depending on size, rated −25 °C to +85 °C. It is a known-good, widely stocked product with a long field record across industrial, outdoor, and equipment wiring. The only reasons to look past it are commercial: distributor lead times on specific pin counts, minimum-order friction, and the absence of lot-level traceability documents that some QC regimes now demand. None of those are performance faults — they’re artefacts of buying through a distribution channel rather than from the factory. Nothing below disparages the original; every alternative competes on supply and documentation, not on a claim that it seals or carries current better than the genuine part.

Verchil SP/SL — Closest Match + Better Lead Time & Traceability

Verchil makes its own SP and SL series to the same SP13/SP17/SP21 naming and the same 13/17/21 mm panel cutouts, so the pair drops into an unchanged hole. SP denotes solder/weld termination and SL denotes screw-clamp; the two share electrical and sealing specs, so you pick by how you terminate, not by performance. Per-contact current runs 3–25 A on SP13, 5–10 A on SP17, and 5–30 A on SP21 as pin count varies, with IP68 sealing in the mated condition. Where it pulls ahead of the baseline is commercial: lot-traceable QC records, 24–48 h stock, and OEM/ODM tooling for non-standard pin or keying variants. The range is built under an ISO 9001 quality system and carries CE, UL, and RoHS marks, so the compliance boxes an importer needs are already ticked rather than chased after the fact. Honest limit: this is a system-level swap — replace both the plug and the panel socket from Verchil rather than mating a Verchil plug to an installed Weipu socket. If an installed Weipu half has to stay in the panel, treat it as a sample-and-validate job, not a guaranteed mate.

INTE-AUTO SP-series — Closest Match (self-declared cross-compatibility)

INTE-AUTO offers an SP-named threaded range at the same 13/17/21 mm cutouts and markets it as cross-compatible with the SP standard. As a same-cutout, same-thread option it is a genuine closest-match candidate on the dimensional axis. Treat the cross-brand intermating claim the way you’d treat any third party’s: validate a sample pair against your installed half before committing a batch, because — as Weipu itself states — cross-brand mating “cannot be guaranteed.” On the dimensional axis it scores the same as Verchil; where it’s harder to score is documentation, which varies by supplier, so confirm what QC paperwork ships with it before you rely on it for an audited build.

Rectangular heavy-duty (HDC) — Distribution Alternative

When the real requirement is a single high-pin-count entry feeding a panel rather than a round 13–21 mm hole, a rectangular heavy-duty insert (HDC frame with crimp contacts) is the alternative worth pricing. It does not drop into an SP cutout — it is a different mechanical format — but for power-plus-signal distribution behind one gland it often beats stacking several SP shells. Choose it when you’re consolidating, not when you’re replacing an existing round hole.

GX series — Adjacent Format

GX (GX12/GX16/GX20) is the sister circular-threaded format and the natural neighbour when your cutout isn’t 13/17/21 mm. GX16 lands near the SP17 envelope but is a different cutout, so it is an adjacent option, not a drop-in for an SP hole. Reach for GX when you’re choosing a hole size fresh; reach for SP/SL when an SP hole already exists. The two formats are easy to confuse on a datasheet because their current and IP figures overlap, so the cutout dimension — not the family name — is the line that decides whether it’s a drop-in or a redesign.

Full Comparison: Alternatives vs the Weipu Baseline

The baseline column is genuine Weipu — the part you are replacing — so you can read every alternative as a delta against what you already know.

Weipu and Verchil values per sources cited in the quick table above; cross-compatibility for any non-Verchil row is self-declared by that maker and unverified by Weipu. Retrieved 2026-06-29. “Closest Match” is a dimensional statement (same cutout/thread), not a claim of guaranteed intermating with an installed Weipu half.

Matching More Than the Panel Hole

Same cutout gets you past the first gate, but a connector you can actually wire has to match three more things: the cable it clamps, the way it’s keyed, and how the contacts terminate. Skip these and a “same size” part still fails on the bench.

Cable outer diameter. Each SP size accepts a band of cable OD, and the band scales with the shell. Verchil’s SP13/SL13 clamp roughly 4.0–6.5 mm cable, SP17/SL17 around 4.0–7.5 mm, and SP21/SL21 about 8.0–12.0 mm. If your existing harness uses a 9 mm jacket, an SP17 won’t seal on it no matter how well the panel hole lines up — you’d move to SP21 or accept a gland adapter. Check the OD before you check anything else electrical.

Keying and pole position. Within one shell size, pole count and the keyway set whether two halves actually mate. A 4-pole SP21 and a 12-pole SP21 share the 21 mm cutout but are not interchangeable mates. When you cross-reference, match the pole count and confirm the keyway orientation, not just the millimetre.

Termination — the SP vs SL fork. This is where Verchil’s two letters earn their keep. SP terminals are solder/weld, which suits factory-loomed assemblies and the highest vibration tolerance; SL uses a screw clamp, which lets a field tech re-terminate without a soldering iron. Electrically and on sealing they’re identical, so the choice is purely about who assembles the cable and where. Replacing a soldered Weipu SP with a screw-clamp SL is a legitimate upgrade if your field service team has been fighting solder rework — same hole, same seal, easier maintenance.

IP rating is a mated-condition claim. Every IP68 figure in this article — Weipu’s and Verchil’s alike — holds only when the pair is mated and the gland is torqued onto a cable inside its OD band. An unmated half is just a shell. So when you compare sealing, you’re comparing the system, which is one more reason the honest unit of replacement is the pair, not a single connector.

Chart 1 — Peak per-shell current by size: Weipu vs Verchil

Both ranges follow the same physics: current per contact falls as you pack more pins into the same shell, and the headline figure is the low-pin-count peak. The chart reads the top rating of each size so you can confirm the alternative covers your load before you match pins.

Peak-current figures are the low-pin-count maxima from the quick-table sources. Verchil’s SP13 reaches a higher per-contact peak; SP17 and SP21 peaks match the Weipu baseline. Always derate to your actual pin count — these are ceilings, not your operating point.

Chart 2 — The four-question drop-in test

Before you compare any spec, run these four gates. Pass all four and an alternative is a true system-level drop-in; fail one and you’re choosing a new format, not replacing the old one.

Logic per the honest-caliber rule stated in the intro: “drop-in” is system-level (swap plug + socket together). Q4 encodes Weipu’s own position that cross-brand mating “cannot be guaranteed”.

Lead Time and Traceability

Almost nobody leaves a working connector over sealing physics — the SP standard’s IP68 is mature and the genuine part performs. People switch for two unglamorous reasons, and both sit in the commercial column of the table, not the electrical one.

Lead time. Distributor stock on genuine SP parts is uneven by pin count. A 2-pole SP21 is usually on the shelf; a 9- or 12-pole variant in a specific keying can run to weeks, and a production line waiting on connectors is the most expensive kind of idle. Verchil holds standard SP/SL sizes in 24–48 h stock and runs OEM/ODM tooling for the non-standard pin and keying variants that distributors don’t carry. When the bottleneck is “we can’t get the odd pin count fast enough,” that’s the axis that matters.

Traceability. More QC regimes now ask for lot-level documentation — which batch, tested to what, on what date — and a connector that only ships a generic datasheet can’t answer that. Verchil supplies SP/SL with lot-traceable QC records, which is the one thing the genuine baseline doesn’t bundle as standard. For audited builds (medical-adjacent, rail, anything with a customer quality clause), the paperwork is the deciding feature, and it’s why a buyer who is otherwise happy with the original will still move.

Which Alternative Wins — and When

There is no single winner; there is a winner per scenario, and the scenario decides.

• Replacing both halves at a known SP cutout, and you need traceability or fast restock: Verchil SP/SL is the closest match. Same SP13/SP17/SP21 naming, same 13/17/21 mm holes, IP68 mated, plus the two things the genuine baseline doesn’t bundle — lot-traceable QC and 24–48 h stock. Pick SP for solder/weld, SL for screw-clamp.
• You only control one end and an installed Weipu half stays in the panel: no third-party part is a guaranteed answer. Buy one sample pair, bench-test it against the installed half, and only then commit — this is exactly the case Weipu’s FAQ disclaims.
• The hole isn’t 13/17/21 mm yet: you’re not replacing, you’re specifying. Go to GX (round) or rectangular HDC (high pin count behind one gland) and choose the cutout fresh.
• Pure lowest-unit-price, compatibility self-declared: INTE-AUTO and other SP-named ranges sit here — same cutout on paper, but validate the mating claim yourself before a batch.

The honest summary: for the most common job — swapping a worn or back-ordered SP plug-and-socket pair at an unchanged panel hole, with paperwork your QC will accept — Verchil SP/SL is the strongest drop-in because it is the same connector by name and cutout, sourced as a matched pair, with traceability the original doesn’t ship as standard. For anything that isn’t that job, the table above points you to the right format — GX, HDC, or the genuine baseline — instead of overselling a single answer.

FAQ