Sensor drop
Write the sensor type, whether the plug is molded or field-wired, the coding letter on the drawing, and the cable jacket. A 3-pin and a 4-pin body can share a thread and still fail the pin map.
Application brief
M8 circular connector supplier questions for a real run
An m8 circular connector supplier should answer the host, coding, pin count, jacket and inspection stage of the project you are buying for. LinkScope Sourcing 37 turns that project context into the RFQ. It does not design the machine and it does not stock M8 shells.
Translate the run into purchase facts
Cabinet bulkhead
Record panel thickness, jam-nut or flange, rear wire gauge and the gasket. The cutout diameter comes from the drawing, not from a photo of a similar nut.
Machine I/O whip
State length, shield drain, overmold material and the connector gender at each end. If the whip includes a network pair, say whether impedance is in scope. Otherwise keep the connector line mechanical.
Outdoor enclosure
Copy the ingress protection code and the mated or unmated condition. Temperature window and sunlight exposure are separate cells. An outdoor photo is not a test report.
Coding choice to settle in the brief
M8 bodies are often discussed as coding A for sensors, coding B for some fieldbus layouts, and coding D when the drawing is aiming at an Ethernet-style pinout. Those letters are not interchangeable just because the thread matches. The table is a buying question, not a ranking.
| If the drawing says | Put this in the RFQ | Do not assume |
|---|---|---|
| Coding A | Pin count, key position and whether pins are power, signal or both | That a coding B shell will seat |
| Coding B | The bus or I/O the plant must keep, plus shield termination | That sensor pinouts transfer |
| Coding D | Pair assignment and whether the cable impedance note is in this RFQ | That a generic 4-pin sensor cord is equivalent |
| Silent | Leave coding blank and ask each supplier to state the letter on the quoted model | A letter from a previous job |
New and refurbished shells are a real purchasing split. A new M8 body can carry a current plating note and a stated cycle life such as 100 cycles. A refurbished body can be the physical match for a legacy key when the plant states remaining cycles, condition and warranty in writing. Neither side is chosen by this desk. The same split applies to an OEM-coded part number versus a compatible shell: the coded part may follow the host vendor drawing, while a compatible shell is comparable when pinout, coding and the sealing test match. Write 3-pin or 4-pin, 4 A, 60 V, IP67 and the panel cutout in millimetres from your drawing. Insertion loss at a stated frequency, return loss, impedance and VSWR stay on the cable line. Measurement accuracy belongs to the cited test, not to a cabinet photo.
Documents to confirm with the destination: the drawing revision used for the cutout, the inspection stage that checks coding, and any site rule on jacket material. Delivery can be split between sample pieces and the production lot. Write both timings if they differ. Current and voltage stay per contact. Connector mating cycle life is copied from the drawing with its test method, or left open.
Application questions that change the purchase
What is the project use?
Name the machine, cabinet or sensor run, the environment, and whether the connector is mated once at install or cycled in service. That sentence changes sealing checks and backshell choice.
Which site constraints belong in the file?
Panel thickness, bend space behind the door, washdown practice and who holds the crimp tool. If torque is printed on the drawing, copy the number and the unit. If it is absent, do not invent one.
How should an alternative be marked?
Ask the m8 circular connector supplier to label compliant, deviation and optional lines. A shared thread name is not enough to accept a substitute pinout.
What arrives before the lot?
Agree the sample count, the drawing revision on the sample, and the incoming checks: key position, pin map, plating appearance and a mated seal check if the fixture exists. Production release stays a separate decision.
Request factory quotes for this run
Include coding, pin count, quantity and the US destination. The strip below is the same inquiry form used across the desk, placed under the application notes rather than inside a dialog.
Inquiry rows and the contact page use the same requirement fields.