LLT ENGINEERING · Application analysis
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Waterproof Connector Manufacturer RFQ Requirements Checklist
A waterproof connector RFQ is only comparable across suppliers when every quote is tied to the same configuration, the same cable, and the same responsibility scope. This checklist covers the interface pair, electrical load, cable data, environment, and acceptance documents a manufacturer needs before pricing can be compared.
Scope and boundaries
Applies to RFQs for circular waterproof connectors and matching cable assemblies sent to a connector manufacturer for equipment projects. The sources behind this article define what an RFQ should contain and which conditions each rating depends on; they do not provide prices, minimum order quantities, lead times, or certification scope for any specific part number, so all of those stay on the confirmation list.
Why Two Quotes for the Same Series Name Are Not Comparable
A request that says only 'M12 waterproof connector, 5,000 pieces' gives a manufacturer room to quote several different products. Within one series name there are multiple pin counts, termination styles, cable ranges, locking structures, and plating options, and each combination prices differently. A waterproof connector RFQ is only comparable across suppliers when every quote is tied to the same configuration, the same cable, and the same responsibility scope. Until that is fixed, a lower number may simply describe a smaller product.
Sources: LLT selection guide · LLT public connector catalog
Fix the Mating Pair and Pin Assignment First
Start with the interface task on the equipment: cable-to-cable in the field, a panel-mounted inlet, or a harness branch. State the exact part numbers on both sides of the mating pair, the pin count, and the pin assignment. Contact gender (male or female pins) and housing or mounting style are separate choices, and both belong in the RFQ.
Do not assume that two connectors called M8, M12, or M16 will intermate: mating depends on interface dimensions, thread or locking structure, coding, pin count, and the specified mating model. Face views should state the viewing direction and keying datum rather than inferring compatibility from a mirrored drawing. Where a drawing or sample exists, include it as the engineering starting point.
Sources: LLT selection guide · Technical applicability
List Load, Conductor, and Cable as Separate Line Items
Give working voltage, current per contact, pin count, and whether the circuit carries power, signal, or both. In mixed layouts such as 3+2, the two contact groups carry different ratings; never add the group currents into a single machine rating, and check the wire size for each group separately.
Conductor cross-sectional area in mm² and wire gauge in AWG describe the conductor; the jacket outer diameter in mm is a separate specification that drives sealing and clamping. Two cables with the same conductor area can have different outer diameters because of core count, insulation, or jacket. The cable OD must fall inside the sealing range of the chosen configuration, not merely below a catalog maximum, and conductor area alone does not set the ampacity of the whole configuration.
Sources: Technical applicability · LLT selection guide
Match Mounting and Environment to Verified Conditions
If the connector mounts on a panel, supply the cutout and panel thickness from the drawing; a cable-to-cable joint does not need panel data, so do not ask suppliers to quote against it. Then describe the environment: temperature, vibration, spray or immersion, UV exposure, salt, and cleaning method.
IP67 describes dust protection and short-term immersion under defined test conditions, and it holds only when the connector is correctly mated and locked, the seals are intact, and the specified cable outer diameter is sealed as required. Long-term immersion and high-pressure washdown are different test regimes; give water depth, duration, temperature, medium, and wash method so a verified configuration can be selected. Supplier-declared figures such as UV resistance of 1,000 hours or more and salt spray of 480 hours or more apply to specific material and coating combinations under stated test conditions; they are declarations tied to the applicable records, not verified results for the part number in your RFQ.
Sources: Technical applicability · IEC 60529 — Degrees of protection provided by enclosures
Request Drawings, Records, and Certification Scope
Ask for part-number drawings showing the mating face, viewing direction, and keying datum, plus termination and strip-length data where the connector is field-assembly. Acceptance documents should tie inspection results to model, sample version, and test conditions, so that samples, pilot runs, and volume deliveries refer to the same basis.
For certifications, provide the target model, application, and sales market, then request the applicable UL 2238, UL 1977, CE, TÜV, or SAA documents; coverage is defined by the product models, ratings, and structural versions on each certificate. A UL 94 V-0 yellow card covers the plastic material, not the finished connector, so material approval and product certification must be requested as separate documents.
Sources: Technical applicability · LLT selection guide
Compare Responsibility Scope Before Comparing Price
If a quote arrives without the mating part number, pin assignment, conductor size, and jacket outer diameter, treat it as a budget estimate and pause the comparison until those items are confirmed; otherwise the prices describe different products rather than competing offers. The same applies to scope: a field-assembly connector, a connector supplied with cut cable, and a fully overmolded harness place termination, sealing, and test responsibility on different parties, so their prices are not directly comparable.
For a custom harness, add the interface drawing or mating model, pinout, voltage and current, cable length and tolerance, jacket outer diameter and material, branch positions, exit direction, end preparation, and the environment with its verification requirements. Prices, minimum order quantities, and lead times are confirmed per project and schedule; they are not published data and are not estimated here.
Sources: LLT selection guide
Final RFQ Checklist Before You Send It
The table below summarizes the four requirement groups a manufacturer needs for evaluation; the bullets turn them into a send-ready checklist.
Send this package, with drawings or samples where they exist, to the manufacturer's engineering team. For projects with LLT, the same list is what the engineering team uses to screen configurations and confirm feasibility before a quote is prepared.
- Interface: mating part numbers, pin count, pin assignment, and mounting style, with panel cutout and thickness only where panel-mounted
- Electrical: working voltage, current per contact, and separate ratings for mixed power and signal groups
- Cable: conductor area in mm² or wire gauge in AWG, jacket outer diameter in mm, cable material, length, and end preparation
- Environment: temperature, vibration, exposure media, ingress protection target, and the actual test conditions to verify
- Delivery: quantities per configuration, delivery scope, and the certificates or records required for the target market
Sources: LLT selection guide
Source parameters
| Requirement | Information to confirm |
|---|---|
| Electrical interface | Working voltage, current per contact, pin count and pin assignment |
| Mechanical installation | Panel or cable-end mating, available space and cable exit; add cutout and panel thickness for panel mounting |
| Cable matching | Conductor area (mm²) or wire gauge (AWG), jacket outer diameter, cable material and end preparation |
| Environment and validation | Temperature, vibration, exposure media, ingress protection target and actual test conditions |
Frequently asked questions
Can a manufacturer quote accurately from a series name alone?
Only a budgetary figure. One series covers multiple pin counts, terminations, locking structures, and cable ranges, so a binding quote needs the full configuration, the mating model, and the cable data.
Is conductor cross-section enough to confirm the current rating?
No. Rated current is stated per contact for a specific configuration; simultaneous loading of multiple cores, conductor size, ambient temperature, and heat dissipation all affect temperature rise, so check the datasheet and verify under real conditions.
Does an IP67 line item cover long-term immersion or pressure washing?
No. Short-term immersion, long-term immersion, and high-pressure washdown use different test conditions. State water depth, duration, temperature, medium, and cleaning method in the RFQ so a configuration with matching verification can be selected.
Which certification documents should the RFQ ask for?
Name the target model and market, then request the applicable UL 2238, UL 1977, CE, TÜV, or SAA files. Coverage follows the models and ratings on each certificate, and a material yellow card does not replace product certification.