Y27 series circular electrical connector,4PIN,Y27A‑08‑04‑TJⅡ| Y27A‑08‑04‑ZKⅡB
Y27 series 4-pin circular connector, IP67 sealed for automation, automotive and renewable energy equipment. Compare variants and request a quote.
View productBuying this part starts with a stable reference rather than a catalogue browse. As a MS27505E21F35SCN connector supplier, CJMCTECH supplies the MIL-DTL-38999 Series I circular connector with a threaded coupling, solder cup contacts and a choice of panel mount or cable mount drawn from the same interface, so a single bill-of-materials line can cover both builds. Working with a MIL-DTL-38999 connector supplier that holds the model, the coupling and the mount format steady across repeat orders is what protects a released bill of materials — and that is the promise this page is built around.
Everything below is fixed at the point of order. Check it line by line against the current revision of the specification before the purchase order is released.
| Parameter | Value |
|---|---|
| Series | MIL-DTL-38999 Series I |
| Coupling | Threaded |
| Mounting formats | Panel mount and cable mount |
| Termination | Solder cup contacts |
| Shell style | Square flange for panel mounting; cable-end body for cable assembly builds |
| Operating temperature | −65 °C to +200 °C |
| Contact current rating | 5 A per contact, derated per the temperature curve |
Current is a per-contact figure, not a connector total. Apply the temperature derating curve before you size the conductor or group loads onto a single insert.
Panel mount and cable mount are drawn from the same interface, which is why both builds can sit on a single bill-of-materials line. The difference is where the connector lives, not what it mates with.
| Question | Panel mount — square flange | Cable mount — cable-end body |
|---|---|---|
| Where the part sits | Fixed into a panel or bulkhead opening | Built onto a loom at the end of a cable run |
| Shell style | Square flange | Cable-end body |
| Shared across both formats | Same interface — which is why both builds can share one bill-of-materials line | |
| Termination | Solder cup contacts on both builds | |
| Backshell compatibility | Standard EMI filter backshells, so shielding and strain relief can be ordered with the connector | |
| Buyer decision | Order the flange build when the mating half arrives on a flying lead and the receptacle must stay put | Order the cable-end build when your own shop is terminating the loom |
Mount format is the one choice a buyer makes that cannot be recovered at the bench. The interface is identical, so a wrong pick will still mate — it just will not install. Fix the mount format on the bill of materials first, then let the backshell and loom schedule follow it.
The finish is applied at shell level. That single fact turns a plating question into a pre-order decision on any program that restricts cadmium.
Where cadmium plating is acceptable, the aluminium shell with a cadmium corrosion barrier under a tin outer finish is the as-listed configuration. Release the order against the model string and confirm the mount format on the same line.
On a cadmium-restricted program this must be raised before order release. The finish is applied at shell level and cannot be changed afterwards, so it is not a correction that survives the purchase order — it is a decision that has to happen upstream of it.
Retention comes from the threaded coupling itself rather than from a cable tie or safety wire, so there is no secondary latch to inspect, adjust or lose on the line.
Series I is the original shell style in the 38999 family, and this build uses the threaded version. The collar does the holding, which keeps the inspection step to a visual check of the threads rather than a latch check.
The joint is made in-house, at a cable assembly shop or on a maintenance bench, without a dedicated crimp tool on the line. It suits repair and low-volume loom work where the tooling set is the constraint.
The shell takes standard EMI filter backshells, so shielding and strain relief can be ordered with the connector instead of being sourced as a separate problem after the loom is built.
Read down the left column to find the situation you are in, then take the specification it points to and the decision it forces.
| Your situation | What it points to in this part | The decision to make now |
|---|---|---|
| A panel or bulkhead is already cut and drilled | Panel mount build with a square flange | Confirm the flange build and the model string on the same line before release |
| Your shop builds looms and terminates its own cable | Cable mount cable-end body, built onto a loom | Order the cable version so the joint is made at your own bench |
| The repair bench has no crimp tooling set | Solder cup contacts | Buy the solder cup termination and keep the joint in-house |
| The program restricts cadmium | Cadmium corrosion barrier under a tin finish, applied at shell level | Raise it before order release — it cannot be changed after the shell is finished |
| Vibration, and no safety-wire procedure on the line | Threaded coupling collar carrying retention | Rely on the collar; there is no secondary latch to inspect or adjust |
| The run needs shielding and strain relief | Standard EMI filter backshell compatibility | Order the backshell with the connector rather than after the loom is built |
| A repeat order against an existing bill of materials | Same model, same coupling, same mount format | Verify against the current specification revision, then reorder the identical string |
Series I is the original shell style in the 38999 family. Because the interface follows a published specification, this connector can be checked clause by clause against an existing bill of materials rather than compared to a photograph.
The model, the threaded coupling and the mount format. That continuity is the practical value of a part-anchored order: the reference does not drift between releases.
Mount format, contact termination style and shell finish are all separate choices on this part. A substitute part number can change any one of them while still mating correctly.
Take the clause-level description from the published specification, put it beside your bill of materials, and confirm the string, the mount format and the finish line by line before the order is released.
The fastest route from part number to purchase order is a complete enquiry. Include the following and the reply comes back as a usable quote rather than a round of questions.
Orders are welcome. Send the part number and we will come back with pricing and availability against your quantity and date.
A full range of products is held in stock, though not every item is displayed on the site — the model list is the reference for selection.
Keep adjacent product options together for a faster catalog comparison.
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