The counter-intuitive part of comparing quotes is that the offers are rarely describing the same thing. One arrives per edge, one per metre, one with hardware included and one without, one delivered and one ex-works. Scoring them before normalising is comparing the offers’ shapes rather than their prices, and the cheapest is frequently the one that described the least.
This is a verification checklist for the normalisation step: what scope has to be fixed before quotes are requested, how to convert different units and terms to one basis, and how to build a comparison that can be defended when the decision is questioned.
Comparing plow blade quotes: defining the same scope
Fix the scope before requesting prices.
A comparable comparison starts with a scope fixed in advance: the edge length and thickness, the material and profile, the bolt pattern, the hardware included, the delivery point and the quantity.
Each of those changes the price, and an enquiry that leaves any of them open will produce offers that differ for reasons the comparison cannot see.
The scope also has to state what is excluded, because exclusions are where offers diverge most. Whether the price includes fasteners, whether it includes freight and whether it includes the documentation the fleet’s receiving process requires are three questions that change the total by more than most suppliers’ price differences.
Why offers arrive in different shapes
Suppliers quote in the form that suits their own production and sales process, which is a legitimate commercial choice and an obstacle to comparison. An edge manufacturer quotes in the unit it produces, a distributor quotes in the unit it stocks, and a service supplier quotes the fitted price.
None of those is wrong and none of them is comparable with the others. Recognising that the shape of the offer is a property of the supplier rather than of the product is what makes normalisation feel like arithmetic instead of an argument, because the conversion does not favour any offer.
Procurement practice for public fleets is published by the National Association of Counties and the American Association of State Highway and Transportation Officials, and material and test specifications by ASTM International.
Unit of measure and edge length
Unit is the first normalisation, and it decides whether the rest of the comparison means anything.
| Offered unit | What it describes | Convert to |
|---|---|---|
| Per edge | One complete edge of a stated length | Cost per edge and per metre |
| Per metre | A length, often cut to order | Multiply by the edge length to compare with an edge price |
| Per insert or per position | Component pricing within an edge | Multiply by the positions per edge, then per metre |
| Per set or per machine | A complete set for one machine | Divide by the edges or metres in the set |
The second row is the one that produces most confusion, because metre pricing that excludes cutting, drilling or fitting looks cheaper than an edge price until the additional operations are counted. Converting both to a finished, delivered cost per metre removes the ambiguity.
Included hardware and freight
Hardware and freight are the two inclusions that most often decide a comparison, and both are easy to state in an enquiry. Fasteners are sometimes priced into the edge and sometimes supplied separately, and the difference is material once the number of change-outs is considered.
Freight is the larger of the two and the one with more variables. Two offers with the same goods price can differ by the cost of carriage to the fleet’s store, and where one is quoted ex-works and the other delivered the comparison cannot be made without converting both. That conversion uses the fleet’s own freight estimate, and the method is set out on the landed cost page.
Tolerances and documentation
Tolerances and documentation are the two inclusions that do not appear in the price and do change the cost of ownership. An edge quoted without a stated tolerance on the dimensions that locate it may fit and may not, and the cost of a fitment problem lands on the fleet’s labour rather than on the supplier’s invoice.
Documentation behaves the same way. A supplier who issues a dimensional record and a batch reference with each lot gives the fleet something to check at goods-in and to claim against later; one who does not leaves the fleet relying on the delivery note. Both offers are legitimate, and only one of them carries the cost of the missing record. Drawing and dimensional conventions for stating these requirements are published by ASME and ISO.
Lead time and delivery terms
Lead time is a cost even though it does not appear on an invoice, and the table below sets out how to make it comparable between offers.
| Element | What to require | What it changes |
|---|---|---|
| Quoted lead time | Stated in weeks from order, for the quantity quoted | Whether the order lands in the season or before it |
| Delivery terms | The named point, so both offers are compared delivered | The freight element of the landed cost |
| Partial deliveries | Whether part of the order can ship first | Whether the fleet gets some of the quantity early |
| Seasonal commitment | Whether the lead time holds at peak | The risk the order arrives late when it matters most |
The fourth row is the one worth asking explicitly. A lead time quoted in a quiet month and the same supplier’s lead time in the peak week are different figures, and the fleet’s exposure sits with the second.
Warranty and remedy
Warranty terms belong in the comparison because they change the expected cost of a failure, and they are the element most often summarised as a duration. What matters is not the length but three details: what the warranty covers, what evidence it requires, and what the remedy is.
A supplier whose remedy is a replacement part and one whose remedy is a credit against a future order are offering different value, and a warranty that requires evidence the fleet does not routinely collect is worth less than its duration suggests. The valuation of those terms is examined on the warranty value page.
Building the comparison worksheet
The worksheet that makes competing offers comparable is short and fixed.
- One column per supplier, with the scope fixed and stated at the top.
- A row per element: goods, hardware, freight, duty where applicable, and any tooling or set-up.
- A total per edge and a total per metre, calculated rather than typed.
- A row for the inclusions that are not priced: tolerances, documentation, and the warranty terms.
- A row for lead time and delivery terms.
The fourth and fifth rows are what turn a price comparison into a decision. They do not convert to money in the worksheet, and they are the elements that most often justify paying more.
Normalising before scoring
Scoring should happen after normalisation rather than during it, and the sequence keeps the two from contaminating each other.
- Convert every offer to the fixed scope and the same delivery point.
- Express each in the same unit, per edge and per metre.
- State the assumptions used for any conversion the fleet applied itself.
- Score the normalised figures against the fleet’s criteria, with the non-priced inclusions treated separately.
The third step protects the process. Where a fleet has converted an ex-works offer using its own freight estimate, stating that assumption allows a reviewer to challenge the conversion rather than the conclusion.
When the cheapest offer is the right one
The cheapest normalised offer is the right answer where the scope is genuinely identical and the inclusions are equivalent. That is not a rare outcome; where a specification has been stated properly and the suppliers are comparable, price differences usually reflect scale, position in the season or the supplier’s own cost base.
It stops being the right answer where the difference sits in the unpriced rows: a shorter tolerance on the dimensions that locate the edge, documentation that supports a claim, or a lead time that arrives before the season. Those are the three that most often justify the higher figure.
What to do when a supplier will not quote on your terms
A supplier who quotes in their own format is not excluded; their offer is converted. The conversion uses the fleet’s own cost estimates for the elements the supplier excluded, the assumptions are stated, and the offer is scored on the converted figure like any other.
What has to be avoided is converting one offer and not another. A comparison in which one supplier’s price has been adjusted for freight and another’s has not will produce a decision that reflects the method rather than the market, and it is the most common way a normalisation exercise goes wrong.
SENTHAI manufactures plow edges, wear plates and carbide inserts in Rayong, Thailand, and quotes to a stated scope with the tolerances, hardware and documentation named, so an offer can be compared without conversion. Quotes for a specific pattern and quantity can be requested through the contact page, and the tender clauses that produce comparable bids are set out on the tender specification page.
FAQ
How do you compare plow blade quotations fairly?
By normalising every offer to the same scope and delivery point, then expressing the total per metre of edge and per edge. Offers quoted on different terms, with different inclusions and in different units, cannot be scored against each other until that conversion has been done.
What should every quote be asked to include?
The specification with tolerances, the fixing hardware, the delivery terms, the lead time, the documentation issued with the lot and the warranty terms. Those six are the ones that change the total or the risk, and asking for them in the enquiry is what produces comparable answers.
What if a supplier will not quote on your terms?
Convert their offer using your own estimates, state the assumptions, and score it on the converted figure. A supplier who quotes on their own terms is not excluded, but the conversion should be applied consistently so that every offer is judged on the same delivery point.
Send the specification, the quantity and the delivery point. The SENTHAI engineering desk will quote against that scope with the tolerances and documentation named, so the offer can be scored without conversion.