How to specify industrial parts for a sourcing enquiry

What is industrial parts sourcing?

Industrial parts sourcing is the process of identifying a required component, establishing its specification and finding a supply option that meets the job. For maintenance, repair and operations (MRO), the starting point is often a worn part or an incomplete marking. For production, it is more often a controlled drawing, a standard or a manufacturer's part number.

The outcome needs to be more precise than a similar-looking item. A useful quotation identifies what is being offered, the quantity, the price and the lead time. Where an alternative is proposed, the differences need to be explicit so the person responsible for the equipment can approve it.

Start with the complete reference

Copy the manufacturer's name and the entire part marking, including letters, separators and suffixes. Include the equipment make, model and assembly reference when available. A drawing number needs its revision as well: a familiar number against an older revision can describe a different requirement.

If a marking is damaged, distinguish characters you can read from characters you are guessing. Say whether the reference comes from the original component, a parts list, an old invoice or a possible substitute. An old purchasing record is useful evidence, but it should not silently become the current specification.

Measure the relevant features and state the units

Record each dimension with its feature name and unit. For a bearing, the useful starting dimensions are bore, outside diameter and width. Those measurements narrow down a basic designation; they do not establish every seal, shield, clearance or other feature of the complete bearing.

For a retaining ring, establish whether it fits a shaft, a bore or a shaft groove. DIN 471 external circlips use nominal shaft diameter, DIN 472 internal circlips use nominal bore diameter and DIN 6799 E-clips use nominal groove diameter. Measuring the loose ring across its outside edge does not establish that nominal size.

For other parts, label the measurements rather than sending an unexplained string of numbers. Record any tolerance from the drawing separately from your measured value. Mention wear, damage or a surface you could not reach, and avoid presenting a rough measurement as an exact specification.

Include material, finish and application requirements

Give the material grade and finish where specified. Copy a known standard or manufacturer's requirement rather than replacing it with a broad label such as 'steel'. If the grade is unknown, say so. Appearance alone is not enough to establish a material or coating.

Describe the application details that your specification requires the supplier to check. These may include temperature, exposure, loading, speed or compatibility with another component. State any documentation or traceability you need at the enquiry stage so the quotation can address it.

If an alternative may be considered, explain which requirements must stay the same and who will approve the substitution. A dimensional match alone does not establish that two components are interchangeable.

State the quantity and the actual required date

Distinguish the number of individual components from the number of packs. State the immediate requirement and, separately, any expected repeat quantity. A one-off maintenance replacement and a recurring production requirement can have different supply options.

Include the delivery postcode and the date the parts are needed at your premises. Say whether a partial quantity would help. 'Urgent' explains the priority, but a calendar date gives a supplier something concrete to assess. Ask for the lead time and any supply conditions to be confirmed in the quotation.

Copy this industrial parts RFQ template

Part type and application: … Manufacturer and complete part number: … Drawing number, revision or applicable standard: … Dimensions, feature names and units: … Material grade and finish: … Required quantity in pieces or packs: … Delivery postcode and required arrival date: … Original specified part required, or alternatives considered: … Documentation or traceability required: … Unknown details and measurements to confirm: …

RFQ means request for quotation. You do not need a completed answer to every line before contacting Axial Supply. Send the facts you have and identify the gaps. The trade desk will review the requirement and confirm whether we can supply the part; unlisted components are quoted individually.

Check the offered specification before placing the order

Compare the offered part reference, revision, material, dimensions, quantity and required documentation with your enquiry. If the quote proposes an alternative, resolve the differences before approval rather than assuming a similar description is a like-for-like replacement.

For items in Axial Supply's online retaining-ring catalogue, check the stated standard, nominal size, pack quantity and availability on the product page. The bearing reference is an identification resource; a listed designation is not a statement that the bearing is stocked or directly orderable online.