Waterproof Connector Manufacturer RFQ: What to Specify

Scope and boundaries

For buyers preparing an RFQ for waterproof circular connectors or custom cable assemblies, covering power and signal interfaces, panel-mount and in-line mating, standard and custom parts. A waterproof connector RFQ is only comparable across suppliers when every quote is tied to the same configured part. This article can define what a complete RFQ should contain, but it cannot state pricing, minimum order quantity, stock, or lead time for any model; those terms are only confirmed in the project-specific quotation.

Start with what the quote is missing

Most stalled connector inquiries fail the same way: the RFQ names a series, a pin count, and an IP rating, and every supplier prices a different configuration. One quotes a field-assembly plug, another an overmolded cable assembly, a third assumes different contact plating. A waterproof connector RFQ is only comparable across suppliers when every quote is tied to the same configured part.

If any of these items is still open — the exact mating model, the cable jacket diameter, or the required certificates — mark the returned price as budgetary and ask for a quotation against a fixed configuration; if they are all fixed, the quotes can be compared line by line.

Sources: LLT selection guide · Technical applicability

Define the interface task before the part number

Start from the equipment, not the catalog. State whether the interface carries power, signal, or both, and give working voltage, current per contact, pin count, and pin assignment. Hybrid layouts such as 3+2 are two contact groups with separate ratings; the two current ratings are checked separately and are never added together as a machine-level rating. Multi-core simultaneous loading and ambient temperature influence temperature rise, so worst-case load belongs in the RFQ, not only nominal values.

Sources: Technical applicability · LLT selection guide

Specify the mating pair, not just the series name

A series label such as M8, M12, or M16 does not guarantee intermateability; pairing depends on interface dimensions, thread or locking style, coding, pin count, and the exact mating models on both sides. Give the full part numbers for plug and receptacle, contact gender (pins or sockets) and housing gender separately, and the mounting style: front panel mount, rear panel mount, flange, or in-line cable-end mating.

Panel cutout and panel thickness apply only to panel-mount parts; for an in-line cable splice those dimensions do not apply, and asking for them only adds clarification rounds. Face-view drawings should show viewing direction and keying reference, because a mirrored drawing cannot prove two parts mate.

Sources: Technical applicability · LLT selection guide

Write load, conductor, and cable as separate lines

Three cable numbers are routinely merged into one, and that breaks sealing. Conductor cross-sectional area in mm² and wire gauge in AWG both describe conductor size in different designation systems, and the jacket outer diameter in mm is a separate dimension that has to fall inside the sealing range of the selected configuration. State which designation you use, check it against the terminal data and catalog correspondence of the chosen model, and remember that two cables with the same conductor area can have different jacket diameters depending on core count, insulation, and jacket material.

Add cable length, flexibility, exit direction, and end preparation. A conductor that fits the contact does not seal the assembly; the back-end clamping and sealing range must match the actual jacket.

Sources: Technical applicability · LLT selection guide · LLT public connector catalog

Attach drawings and name the acceptance documents

Attach the interface drawing or mating part number, the wiring definition, and — for harnesses — length and tolerance, branch positions, exit directions, and end treatment. Name the certificates you expect: UL 2238, UL 1977, CE, TÜV, and SAA coverage is defined per certificate by model, ratings, and structural version, so list your models and target markets and ask for the corresponding files.

UL 94 V-0 is a flammability classification for a plastic material, so a housing molded from a Yellow Card material does not by itself give the finished connector a UL product certification. State the ingress protection target with its conditions, not as a bare code: IP67 denotes dust protection and short-term immersion under defined test conditions per IEC 60529, and un-mated faces need separate treatment.

Sources: LLT selection guide · Technical applicability · IEC 60529 — Degrees of protection provided by enclosures

Keep declared performance declared until records arrive

Published figures such as UV resistance over 1,000 hours, salt spray over 480 hours, or a temperature-rise limit under vibration are supplier-declared performance information. Each applies to a specific material, plating thickness, sample state, and test setup, and test hours do not convert directly into years outdoors. Write the environment you actually have — UV, salt, washdown, immersion, temperature, vibration — and request the record matching your configuration. A number without its test conditions is a brochure line, not an acceptance criterion; if no record exists for your configuration, treat it as an open validation item.

Sources: Technical applicability

Lock quantities and delivery scope before comparing prices

Price only means something with quantity and scope attached. State estimated quantities, whether you want connectors only or overmolded cable assemblies, who supplies the cable, and whether field-assembly or factory-terminated parts fit your build. Field assembly sets length on site; an overmolded harness fixes length, wiring, and end structure in advance — different unit prices and different responsibility boundaries. This article can define what a complete RFQ should contain, but it cannot state pricing, minimum order quantity, stock, or lead time for any model; those terms are only confirmed in the project-specific quotation.

• Working voltage, current per contact, pin count and assignment
• Exact mating models on both sides, with contact and housing gender
• Mounting style, plus cutout and panel thickness for panel-mount parts
• Conductor area in mm² or wire gauge in AWG, plus jacket outer diameter in mm
• Environment, ingress protection target with conditions, certificates by model
• Quantities, delivery scope, and who supplies the cable

Sources: LLT selection guide · Technical applicability

Source parameters

Original table and applicability

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