Written for Texas road foremen and county road & bridge crews — what the blade types actually mean, how long they last, and the four numbers you need to order the right edge the first time.
Flat blades — Best for light surface grading, ditch work, and spreading material that doesn't need to be carried far. The flat profile sits close to the road surface and gives you consistent contact across the full blade width. Great for routine caliche road maintenance when the material is already loose.
Curved (crowned) blades — The blade has a slight arc from top to bottom. When the grader moves material, that curve rolls it forward like a wave and re-deposits it evenly. Choose curved blades when you're redistributing gravel or pulling up compacted caliche and spreading it back across the roadway.
Heat-treated (through-hardened) steel — The most common choice for general road work. The entire blade is hardened during manufacturing, typically reaching 400–500 Brinell Hardness (BHN). Harder steel resists wear longer. On Texas caliche and gravel roads — which are highly abrasive — a good heat-treated blade gives solid service life at a reasonable cost.
Carbide-insert (carbide-tipped) blades — Tungsten carbide inserts are embedded into or welded onto the cutting edge. Carbide is dramatically harder than steel (roughly 1,800 BHN equivalent in wear resistance). In high-abrasion conditions, carbide blades can last 10–20 times longer than standard steel. The tradeoff: higher upfront cost, and carbide is brittle under heavy impact — so rocky or debris-heavy roads can chip the inserts.
End bits are the replaceable pieces bolted to each end of the main cutting edge — where the blade is most exposed during angled grading and ditch-cutting. They take the hardest hits. End bits are designed to be replaced independently, so you don't have to swap out the entire blade just because the corners are worn. Always check end bits at every blade inspection — they typically wear out faster than the center section.
| Blade type | Typical wear life | Best suited for |
|---|---|---|
| Heat-treated steel (400–500 BHN) | Moderate — varies by abrasion & hours | General grading, mixed conditions, budget-conscious fleets |
| High-carbon / AR steel (500+ BHN) | Good — harder, longer lasting | High-abrasion gravel & caliche roads |
| Carbide-insert / tipped | Excellent — up to 10–20× steel life | Severe abrasion, dry caliche, high-mileage routes |
When ordering replacement cutting edges, you need four measurements:
Length — The total blade length in inches or feet. Common motor grader blades run 84" (7 ft) to 144" (12 ft). Match your grader's moldboard size.
Width — How tall (deep) the blade is, measured from top edge to bottom cutting edge. Typical widths: 6", 8", or 10". Wider blades give more wear surface before replacement.
Thickness (gauge) — Ranges from 1/2" to 1" or more. Thicker blades last longer and resist bending on hard material. Common sizes: 5/8" and 3/4" for most county graders.
Bolt-hole pattern — Blades bolt to the moldboard using countersunk square holes (for plow bolts) on standard centers, often 6" apart. The number and spacing of holes must match your grader's moldboard exactly. Check your equipment manual or measure the old blade before ordering.
We supply heat-treated and carbide motor-grader blades in bulk to Texas counties and municipalities — bid-spec compliant, delivered. Send your spec sheet or old-blade measurements and we'll quote it fast.
Request a blade quote Call (210) 942-3553 Grader blades overview →