Notes for owners · Business growth
Getting on a plant's approved vendor list: the paperwork and visits a component supplier should expect
A plant adds a component supplier in stages, from enquiry to trial lot, with a visit in the middle, so a ready pack and patient follow-up at each stage beat chasing purchase for an order.
The GullySales team · Updated 17 Oct 2026 · 6 min read
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Imagine you met a plant's vendor development engineer at an exhibition, liked your gears, and that was four months ago. Since then you have sent documents, hosted a visit and rung purchase again and again. A plant adds component suppliers slowly and in stages, and each stage belongs to a different person who moves at their own pace. A ready pack shortens the stages that are waiting on you. A follow-up timed to the stage, and sent to its owner, keeps you on the list without making you a nuisance.
Why a plant adds suppliers slowly
Every new vendor is work for the plant's supplier quality engineers: a visit, a sample approval, extra checks on the first lots, a code in the system. They take it on only for a reason. The current source keeps missing deliveries on a part. A cost-down target needs a second quotation. A new model needs capacity the old suppliers lack. Or a single-source part makes the plant nervous.
The reason sets the pace. A plant replacing a failing supplier counts in weeks. One adding a second source for comfort may leave your file in a drawer for a season. So ask at the first meeting, plainly. "Which parts do you want a new source for, and what made you look?" If nobody can name a part, you are being added to a database, not developed.
The stages, their owners and the right follow-up
The documents themselves are covered in our posts on the documents to keep ready and reading a purchase team's checklist. This post adds the stages, who owns each one at the plant, and what to do while a file waits.
| Stage | Owner at the plant | What you hand over | Follow up by | Stuck when |
|---|---|---|---|---|
| A reason to add a source | Vendor development or purchase engineer | Capability presentation and part families | Asking which parts, once | Nobody can name a part |
| Registration | Purchase and the vendor master team | The document folder, complete | One status check after the time they quoted | A query is waiting at your end |
| Questionnaire | Supplier quality | Honest answers with evidence attached | Sending it complete | Answers left blank "for the visit" |
| Assessment visit | Supplier quality engineer, sometimes purchase | A walk of the shop, records on request | A note the same day asking for the observation list | No list after the visit |
| Closing observations | Supplier quality | One document closing every point | Asking what comes next, after it is sent | Points closed by phone only |
| Samples | Quality and the development engineer | Samples with a report | Asking for the result on the date they gave | "Under inspection" with no date |
| Trial lot | Purchase, planner, incoming inspection | A small order, on time, without a fault | Asking how the lot performed once it is used | No second order after a clean first |
Read the last column whenever a file goes quiet. Sometimes the desk it points to is your own. If the plant never tells you the stage, ask once which it is.
The visit ends with a list, so ask for it
A supplier quality engineer leaves a visit with observations. Two gauges without calibration labels. Rejected parts on the same rack as good ones. No record of the hardness check on the last batch. Small points like these are normal in a small shop.
What the engineer watches is how you close them. Fixing a point and mentioning it on the phone does not close it, because a phone call cannot be filed. Send one document: each observation in the engineer's words, what you changed, a photograph or a page from the new record, the date and who did it. Close every point, including the ones you think are trivial. A file with one open point is an open file.
Following up without chasing
Ring the owner of the stage, not purchase for everything. Purchase cannot release sample drawings while quality's file is open.
Give every follow-up something new to carry: a closed observation, a renewed certificate, a machine you have added. End each conversation with a question: "What is the next step, and when may I check with you?" Write that date down, and do not call before it. When a whole season passes with no word, ask once, plainly, whether the requirement still exists. Who inside the plant can push a stuck file, and how to keep that person informed, is set out in getting on a vendor list without the file stalling.
Imagine: a gear maker in Dharwad and a plant in Pune district
Imagine, as an invented example, a maker of spur gears, helical gears and sprockets in the Belur industrial area of Dharwad, seeking approval at a construction equipment plant in Pune district.
Registration went through quickly, because the folder was ready. The visit went well, and the supplier quality engineer left with five observations. The owner fixed all five within days, told the purchase officer on the phone, and then rang purchase every few days for the sample drawings. Two months went that way, and a competing quotation for the same gear reached the plant. Purchase had nothing to give. Quality's file still showed five open points, because nobody had written to the engineer, and the purchase officer began letting the calls ring.
The quality in-charge then sent the engineer one closure document. It held photographs of the labelled gauges and the new red bin for rejects, and a page from the batch hardness register. The file closed and the sample drawings came through. This time the owner asked purchase one question: what follows the samples, and when should the maker check back? The call came on that date, not before. A trial lot followed the sample approval, but only for one gear, and the competing source kept the rest.
When to wait, and when to walk away
Plants can pause new-vendor work during a model launch or a cost review. Pushing then marks you as someone who does not understand the plant's year. Ask, note the month they give you, and wait.
Public sector buyers register vendors through portals and tenders, so follow the portal's current rules; RFP and tender management covers those document sets. Aerospace, defence and railway parts can carry approvals of their own, which differ by body, so check with the buyer and your own adviser. And if a plant cannot name a part after two conversations, keep your registration current and spend your effort elsewhere.
Write down which stage each plant is at
List every plant where you are mid-approval, with the stage, its owner, what you last handed over and the date you agreed to check back. Where the "stuck" column describes you, fix that first.
The deck a vendor development engineer forwards to the quality team is the part capability presentations cover, and our industrial components page shows what buyers in this trade weigh when they compare makers. If you want the pack and the follow-up plan built around the plants you are chasing, tell us what you need.
