Size the edge from the mouldboard and the mounting pattern, not from the blade width printed on the box. For a truck plow the deciding numbers are the mouldboard width, the bolt pattern, the edge thickness the plow was designed around, and the bevel. Carbide changes the last two, not the first two.
Start from the mouldboard, not the catalogue
A carbide edge is heavier and thicker than the steel edge it replaces. That difference is small in millimetres and large in behaviour: it changes how the blade sits on the shoes, how much load reaches the front axle, and how the plow trips.
So the sizing question is not “what is the biggest edge I can fit”. It is “what does this plow expect, and how much can it carry”.
- Measure the mouldboard, not the old edge. A worn edge is shorter than it was when new, and the ends wear most.
- Record the hole pattern, not just the hole count. Spacing and diameter decide fit; the count alone does not.
- Note the thickness the plow was designed for. A thicker edge changes the trip geometry and the shoe setting.
The four measurements that actually decide fit
| Measurement | Where to take it | Why it decides the order |
|---|---|---|
| Overall length | Along the mouldboard, between the end plates | Too long fouls the ends; too short leaves a strip uncleared |
| Thickness | At the bolt line, on a clean face | Changes trip geometry and the torque the joint can hold |
| Bolt pattern | Centre-to-centre spacing, hole diameter, slot or round | The single most common cause of a wrong order |
| Bevel | End profile, photographed with a ruler | Decides how the edge meets the surface and how it wears |
If you can only send two of the four, send the pattern and the length. Those are the two that cannot be corrected after delivery.
What carbide changes, and what it does not
Carbide inserts sit proud of the steel body. That protrusion is the working part, and it is also the part that changes the effective thickness at the contact line.
- It does not change the bolt pattern. A carbide edge has to fit the same holes; if a supplier offers to “make it fit”, ask for the drawing first.
- It does change weight. A full-width carbide edge can need two people or a hoist, and that is a cost line, not a detail.
- It changes the consequence of a strike. Inserts chip and break where steel would bend, so the edge protects the mouldboard but not itself.
Published dimensions and hole data are on the product page; treat the numbers there as the reference and this page as the method. Carbide snow plow blade — dimensions and hole data.
Sizing for the surface
The same plow can want two different edges depending on what it clears. Width does not change; thickness and bevel do.
- Asphalt and chip seal. A harder, thicker edge lasts, but it transmits more shock into the mount. Check the trip and the shoes after the first storm.
- Gravel and unsealed shoulders. A rigid carbide edge will pick up stone and throw it. If the route includes gravel, size for the gravel and accept shorter life on the paved sections.
- Joints, drains and castings. Any edge that catches a joint loads the end bolts. If the route is full of them, consider a shorter or segmented edge rather than a full-width one.
A sizing checklist
- Measure the mouldboard between the end plates. Write it down, do not photograph it as a substitute.
- Map the hole pattern. Spacing, diameter, slot or round, and the distance from the first hole to each end.
- Record the old edge thickness. If it is worn unevenly, measure at the least worn point.
- Photograph the end profile with a ruler in frame. Bevel angle is hard to describe and easy to see.
- Weigh one new edge before ordering a set. Handling cost is part of the comparison.
- Confirm the fit in writing. A supplier who confirms the pattern owns the fit.
What to send a supplier
The fastest order is the one where the supplier does not have to ask a question. Send the plow make, model and year, the four measurements, two photographs with a tape in frame, and the surface the truck works on.
If the plow is old or unusual, order one set first. A single set that fits is worth more than a discount on five that do not.
Limits
This page describes a method, not a specification for a particular plow. Dimensions and hole data must come from the product page or the maker; I cite no maker-specific figures here because they differ by model and year.
Where a number on this page looks precise, treat it as a range or an example rather than a measured value. The measurements that matter are the ones you take on your own machine.
Quick summary
Size the edge from the mouldboard, the bolt pattern and the thickness the plow was designed around. Carbide changes thickness and weight, not the hole pattern. If you can only send two measurements, send the pattern and the length.
Sources checked on 8 Nov 2026: manufacturer fitment conventions, published hole-pattern practice and our own product dimension tables.
Where this answer says to confirm a detail, that detail is not published on this page and has to come from the product page, the datasheet or the maker.
Three more perspectives
Measure the mouldboard, not the worn edge — a worn edge is shorter at the ends than it was when new.
Ask for the drawing with the datum marked. A supplier who confirms the pattern in writing owns the fit.
If the route includes gravel, size for the gravel and accept shorter life on the paved sections.
