Most connector replacement projects begin the same way: someone reads a number off a plastic housing, searches for it, and finds either nothing or a page that lists the number without explaining what it means. The number on the housing is often an assembly or service number, not the number a distributor stocks. Getting from one to the other is the part of the job that costs the most time.
This guide sets out the method we use when a customer sends an original equipment number and asks for the equivalent. It applies to sealed and unsealed connector systems in automotive and industrial harnesses, and it works the same way whether the original part is still in production or has been discontinued.
What a connector part number actually encodes
A connector reference is not a random string. In most families it is a compressed description of the part’s geometry and performance, and the digits usually carry five kinds of information:
- Series or family — the housing system the part belongs to. Parts from different families do not mate, even when the pin count matches.
- Number of positions — how many circuits the housing carries. This is the number most people check first, and the one that causes the most expensive mistakes when it is the only thing checked.
- Pitch — centre-to-centre distance between terminals, typically expressed in millimetres or in fractions of an inch. A 2.8 mm and a 2.54 mm system look similar and do not interchange.
- Keying and coding — the ribs, slots and colour codes that prevent two adjacent connectors on the same harness from being plugged into each other.
- Plating and material — tin, silver or gold on the terminal; PA66, PBT or PPA on the housing. Plating decides current rating and corrosion behaviour; material decides temperature range.
Two parts can share a pin count and a pitch and still be incompatible, because keying or plating differs. That is why a cross-reference has to be done attribute by attribute rather than by matching digits.
Where to find the original number
Before cross-referencing, confirm that the number you have is the number you think it is. In practice it is marked in one of five places:
- Laser-marked or moulded into the side of the housing, often in small characters near the latch.
- On the terminal position assurance (TPA) device or the cavity plug, which sometimes carries its own number instead of the housing’s.
- In the harness drawing or wire list, where the connector appears as a position with a circuit count.
- In the vehicle or machine service manual, usually as a repair kit number rather than a bare housing.
- On the original packaging or the distributor invoice, if the part has been replaced before.
If the number on the part does not resolve, photograph the housing from two angles with a scale reference and send the images with the harness context. A housing can usually be identified from its latch shape, keying slots and cavity layout even when the marking is worn off.
The five checks that decide whether an equivalent fits
An equivalent is not a lookalike. Before accepting a cross-reference, verify these five points in order. Any single failure means the part does not fit, regardless of how close the rest of the specification is.
- Positions and cavity layout. Same count is not enough — the cavities must be arranged in the same pattern and spaced the same way.
- Keying and colour coding. Confirm the rib positions and the coding colour. Two connectors on one harness are often deliberately keyed differently.
- Sealing class and wire range. A sealed housing needs the right wire seal for the insulation diameter in use. Fitting a seal for a thinner wire leaves a path for water; fitting one that is too thick prevents the terminal from seating.
- Terminal plating and current rating. Match the plating to the application. Substituting tin for silver changes the current the contact can carry and how it behaves under thermal cycling.
- Housing material and temperature range. Engine-adjacent and under-hood positions usually need a higher temperature material than cabin positions.
The order matters. Checking plating before keying wastes time on a part that cannot physically mate.
The five product families involved
Almost every cross-reference request resolves into one of these families. The part counts below are the current catalogue size for each, which is useful when estimating how likely an equivalent already exists.
| Family | What it covers | Part numbers |
|---|---|---|
| Shell / housing | Connector bodies from 1 pin to over 41 pin, sealed and unsealed | 1,245 |
| Terminal | Crimp terminals for the corresponding housing systems | 331 |
| Fastener | Clips, retainers and mounting hardware for connector assemblies | 238 |
| Seals | Wire seals, cavity plugs and sealing components | 167 |
| Needle seat | Terminal position assurance and needle seat components | 138 |
How the reference is presented on this site
Every product page in the catalogue lists two numbers side by side: the LANXI reference and the original equipment number it cross-references. For example, the page for LX71813B-2.8-21-2 shows the corresponding original number 967633-1. Either number can be entered in the site search to reach the same page.
That pairing is the point of the catalogue. It means a buyer holding an original number does not have to interpret it — they can search the number directly and reach the part that replaces it.
Cross-referencing a whole bill of materials
Single-part enquiries are straightforward. The harder case is a harness programme that spans several connector families and several original suppliers, where a bill of materials runs to dozens or hundreds of lines. Sending that list in one request is more efficient than sending it line by line, because the families can be matched together and the gaps identified in one pass.
When sending a bill of materials, include for each line: the original number, the quantity required, and any application note such as position in the harness or temperature environment. Where a line cannot be matched exactly, the note is usually what makes an alternative possible.
Questions we are asked most often
Can a connector with the same pin count be substituted directly?
Not reliably. Pin count is one of five attributes that have to match. Pitch, keying, sealing class and plating all affect whether the part mates and how it performs, and any of them can differ between two housings with the same number of cavities.
What if the original part is discontinued?
Send the original number anyway. Discontinued numbers are the most common reason a cross-reference is requested, and a catalogue that carries original numbers can usually resolve them. If the number itself has been superseded, the marking on the housing or a photograph normally identifies the family.
How do I confirm the wire seal size?
Measure the insulation diameter of the wire actually in use, not the conductor size. Seals are selected by insulation diameter, and the same nominal wire gauge can have different insulation thicknesses between suppliers.
Next step
If you have an original number, search it on this site first — the matching page will show both references. If it does not resolve, send the number, the quantity and a photograph of the housing through the contact form, or by email to shenjian@lanxish.net. Enquiries that include the application and the annual volume are quoted faster, because they answer the questions we would otherwise have to ask.