Most RFQs for industrial spares get forwarded, not answered: several quotes that trace to the same shelf with stacked margins. Who actually holds what — stocking distributors, surplus specialists, OEM desks, chandlers, consolidators — the four kinds of number on a requisition, and the 8-field one-pass RFQ that gets a firm quote without a clarification round.
The path, in order: end user (plant, vessel, rig) → purchaser or purchasing agent → broadcast to a vendor list or marketplace → trading desks with no stock, who forward every line to their own contacts → regional distributors → the manufacturer or its master distributor, which is where the stock and the real lead time live.
Every hop costs three things:
How to see the chain from the buyer's side: quotes with identical lead times and identical datasheets; quotes that land within hours of each other; "subject to prior sale" on every line; a seller who cannot state country of origin, or whether the item is factory-new with the maker's warranty.
How it looks from the supplier's side: a mass-addressed email, no end user, vessel or site named, 30 to 40 lines across ten unrelated makers, "urgent, best price", no delivery point, no need-by date. A list like that has usually visited dozens of desks already and the odds of an order are close to zero, so sourcing hours go elsewhere. We do not quote them. Most established suppliers do not either; they simply never reply. That is why a legitimate buyer using the same format concludes that nobody has the part.
Are intermediaries the problem? Only idle ones. An intermediary earns its margin by adding at least one of five things: consolidation (40 lines, 25 makers, one PO, one shipment, one invoice), identification (a nameplate photo turned into an order number), cross-reference (superseded numbers, equivalent brands to the same spec), paperwork (certificates requested from the maker before shipment, not argued about after), and terms (credit against one vendor record instead of 25). If it adds none of those, go around it.
| Source type | Examples | Best at | Weak at |
|---|---|---|---|
| Broad-line stocking distributors | Grainger (North America), RS (Europe and worldwide) | Stocked MRO, electrical and automation items; next-day delivery; web checkout and ERP punch-out | Anything outside the stocked range; maker-specific marine and process spares; long mixed lists |
| Electronic component distributors | Digi-Key, Mouser, Farnell | Board-level components, connectors, small sensors; deep live stock | Mechanical, fluid power, rotating equipment |
| Surplus and obsolete automation specialists | Radwell, EU Automation | Discontinued PLC, drive and HMI hardware at short notice; repair and exchange | Price; factory-new with maker's warranty; anything outside automation |
| OEM parts desks and authorised service | The equipment maker or its appointed agent | Class-approved, safety-critical and warranty-bound parts; type-approval paperwork | Lead time, minimum order values, small lines |
| Ship chandlers | Wrist Ship Supply, local port chandlers | Deck, engine and cabin stores by IMPA or ISSA code, delivered alongside | Technical spares by maker part number |
| Maritime procurement marketplaces | ShipServ, Procureship | Routing a fleet's requisitions to an approved vendor list | They route and hold nothing; only as good as the vendors behind them |
| Part-number catalogues and consolidators | cballast | Long mixed-brand lists by exact part number: bearings, valves, pumps, seals, fittings, filtration, sensors, instrumentation, electrical; one PO, one invoice; declared equivalents; certificates where the maker holds the approval; recurring accounts | Same-day breakdowns; walk-in and consumer purchases; buyers who need a cart; first order is prepaid |
The honest rule: if Grainger or RS has it on the shelf and you need it tomorrow, buy it there. We would. The job of a catalogue like cballast starts where a stocked range ends: the number that is on nobody's shelf locally, and the 60-line shutdown or dry-dock list that spans 30 makers.
Four kinds of number get mixed up on requisitions. Knowing which one you hold decides who can quote it.
6ES7 315-2AG10-0AB0 is one specific S7-300 CPU. Danfoss 132F0020 is one specific VLT Micro Drive FC 51: 1.5 kW, three-phase 380 to 480 V, IP20. Note what a number excludes as well: 132F0020 ships without the control panel, which has its own order number.FC-051P1K5T4E20H3BXCXXXSXXX. Order number and type code are two names for one item. Quote both and nobody has to ask.Two traps. Suffixes: SKF 6205-2RSH/C3 states the seal type and the internal clearance; drop the suffix and you have ordered a different bearing. Contactor coil voltage lives in the suffix too. Supersession: the number in a twenty-year-old manual may have been replaced twice. A nameplate photo resolves more than any description.
This is why every product page on cballast carries the maker's part number together with the OEM, drawing, superseded and competitor cross-reference numbers we hold for it. Whichever number is on the requisition should land on the same item. We call the approach identifier-first sourcing: the number decides the source, not the other way round.
Copy it, rename it, use it with any supplier. An RFQ that carries these eight fields can be priced firm in one pass, with no clarification round.
1. WHO YOU ARE legal entity, registration or VAT no., your role, company-domain email 2. END USER plant / vessel name + IMO no. / project, or "we are the end user" 3. MAKER as printed on the part 4. PART NUMBER complete, every suffix, plus type code if the nameplate shows one 5. QUANTITY with unit (pcs, m, set, kit) 6. EQUIVALENT OK? yes or no. If yes: what must be held (dimensions, material, rating, approval) 7. DOCUMENTS EN 10204 3.1, CoC, class certificate, ATEX/IECEx, MED, as required per line 8. DELIVERY address or port, need-by date, Incoterm if you have one Optional, and it changes the price: is this demand recurring? State annual quantity if known.
Why each field earns its place:
Our rule at cballast: where the requisition does not mandate a manufacturer, we may offer an equivalent brand to identical specification and identical certification. It is always declared on the quote as an alternative next to the requested brand. It is never swapped silently.
Substitute freely: bearings to the same ISO designation, clearance and seal arrangement; filter elements to the same dimensions, micron rating and media; O-rings and seals to the same size and compound; flanges, fittings and fasteners to the same standard and material grade with EN 10204 3.1 certificates; hoses and gaskets to the same standard.
Do not substitute: class-approved or type-approved components; anything inside an Ex-certified assembly; safety functions (safety relays, SIL-rated devices); parts under OEM warranty; PLC, drive and HMI hardware where firmware and configuration have to match.
132F0020. Any site running these should hold a counted spares list by order number now.The habit that turns emergencies into planned orders: keep a critical spares register by order number (installed quantity, spares on the shelf, lifecycle status, lead time) and send the whole register out for a standing quote once a year. Plants and fleets that do this stop paying breakdown premiums, and it is how most blanket orders begin.
The procurement rule of thumb: roughly 80% of suppliers and transactions carry roughly 20% of spend. In maintenance that tail is thousands of part numbers bought once or twice a year. Unit prices are not the problem. The hidden costs are a vendor onboarding for a single PO, freight paid per line, card purchases outside the system, engineers' hours spent identifying parts, and breakdown premiums.
The fix large operators use is to hand the tail to one or two vetted consolidators under a frame agreement. What a good one contains:
How accounts work at cballast. Every new account is vetted at onboarding. The first order is prepaid. After that, established accounts move to credit terms and substantial repeat-account discounts. We work on quote and invoice, not a checkout. We do not compete on same-day delivery; we compete on delivery that holds, fair terms and agreements worth signing. The buyers we are built for are end users with recurring demand: shipowners and ship managers, water and wastewater utilities, process plants, oil and gas and offshore wind operators, defence. We do not quote broadcast lists with no named end user.
Prepayment on a first order is normal in this trade. Prepayment to an entity you cannot verify is not. Check:
Standards and sources referenced: EN 10204; IMPA Marine Stores Guide; class society rules (DNV, ABS, LR, BV, RINA, CCS, KR, NK); ATEX/IECEx; Marine Equipment Directive; Siemens PM410 (S7-300 type discontinuation); Danfoss FC 51 lifecycle notices.
Questions on a specific number, a supersession, or whether an equivalent is safe for your application are welcome at sales@cballast.com. We answer identification questions whether or not you buy from us. RFQs in the one-pass format go to sales@cballast.com.