MRO Procurement 101: Building a Maintenance Catalogue

Ask a maintenance supervisor what they are short of today and the answer is usually a small item: a contactor, a tap cartridge, a particular size of drill bit. MRO buying is full of items like this. Each is low in value, the variety is endless, and the need is urgent when it appears.

What MRO covers and why it is hard

MRO stands for maintenance, repair and operations. It is everything that keeps a facility running but does not go into a product you sell or a building you construct: electrical consumables, plumbing spares, hand and power tools, fasteners, paint, PPE, hardware and more.

• Long tail: a very large number of distinct items, many bought rarely.
• Many small orders: each generating its own quote, purchase order, delivery and invoice.
• Urgency: a breakdown gives no time for comparison, so buying defaults to whoever answers the phone.
• Inconsistent descriptions: “half-inch tap”, “tap 1/2” and “15 mm tap” may be the same item or three different ones.
• No view of spend: without categories, you cannot see where money goes.

Classify by criticality and usage

ABC-style thinking works without any special software. For each item ask two questions: what happens if we run out, and how often do we use it? The answers sort items into stocking approaches.

The critical class is where your judgement matters most. Our note on critical spares by facility type helps you decide what belongs there.

Standardise items and build the catalogue

One item, one code, one specification. Pick preferred sizes and ratings, write every description in a fixed format (item type, size or rating, standard, material, brand or “equivalent to”), and retire duplicates. Standardising makes quotes comparable, keeps spares interchangeable and gives vendors a clearer view of volume. Involve the maintenance team early. They know what actually gets used.

Then organise the catalogue by category, recording the details that make each item unambiguous.

Min/max and reorder logic

The method is simple. Minimum (reorder point) equals average usage per period multiplied by the replenishment lead time, plus a safety buffer that reflects how variable the usage is and how critical the item is. Maximum equals the minimum plus a sensible order quantity, limited by shelf life, storage space and cash tied up.

When stock touches the minimum, raise a requisition to top up to the maximum. Usage figures come from an issue register (item, quantity, date, area or asset). Without that record, levels are guesses. Review levels periodically and adjust as usage changes, and set lower maximums for items with a shelf life such as paints, adhesives and batteries.

Periodic RFQs and recurring buying

Ad-hoc buying means every need triggers its own price call and purchase order. A better pattern is to collect the requisitions from min/max triggers and issue one RFQ on a schedule that suits your site, reserving ad-hoc purchases for genuine emergencies. Recurring items can move to an agreed list with scheduled deliveries; one-off items get a full-specification RFQ each time. See how to write an RFQ vendors can price for the format.

Measure what matters

• Fill rate: the share of requested lines delivered complete
• Turnaround: time from requisition to delivery
• Spend by category: where the money goes and what could be consolidated
• Critical stock-outs: how often a critical item was not on the shelf
• Emergency purchases: how many needs were met by ad-hoc buying
• Invoice and order mismatches: a sign of unclear specifications

Set a baseline first and judge the trend. No outside benchmark will tell you what is right for your site.

Common pitfalls

• Cataloguing everything at once. Start with the items you buy most often and the critical ones.
• Duplicate records from spelling variants and different units of measure.
• No named owner for the catalogue, so it decays.
• Min/max set once and not reviewed as usage changes.
• Stocking occasional, non-critical items that could be bought on demand.
• Locking to one brand without a reason, which blocks alternatives.
• Ignoring shelf life on paints, adhesives and batteries.

How SupplycZar can help

SupplycZar supplies across 16 product categories, so a catalogue can be quoted and delivered through one vendor. Recurring needs can be organised through recurring facility supplies and MRO procurement, with scope, coverage and specifications confirmed against your site. Start with your top items in categories such as hand tools and power tools and electrical supplies, and send the list for a quote.