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Quick answer: A scrap or demolition shear is a hydraulic attachment mounted on an excavator that cuts through steel, rebar, pipe, and structural beams using two opposing blades. Buyers choose between fixed and rotating models based on the job — rotating shears cost more but cut at any angle without repositioning the excavator, saving hours on demolition sites.
Buying the wrong shear costs you twice: once on the purchase price, and again in downtime when the tool can't handle your material. Get the specs right before you sign, and the attachment pays for itself in cycle time.
A scrap or demolition shear is a hydraulic cutting attachment, and demolition shears mount on an excavator's stick in place of a bucket or grapple. High-pressure fluid from the excavator powers the blades, and hydraulic action works with mechanical leverage to deliver the cut. Two hardened steel blades close on the material — pipe, sheet metal, structural steel, and rebar — and shear it clean, the same way a pair of scissors cuts paper. They are also effective on thick metals such as I-beams and rebar. Recyclers use them for fast dismantling of steel structures and reducing metal into smaller, manageable sizes for recycling. Demolition contractors use them for efficient handling and cutting of scrap metal during building teardown.
Jaw opening, blade material, and cutting force determine what a shear can handle. A shear rated for light gauge sheet metal will not cut a 12-inch I-beam, no matter how much force the excavator applies. Match the shear's tonnage rating to your heaviest expected cut, not your average one.
Fixed shears cost less and weigh less, making them the better choice if your material comes to you already oriented — a scrapyard processing line, for example. Rotating shears cost 20-40% more but rotate 360 degrees continuously, letting the operator adjust the jaw position for precise positioning before each cut. That added rotation improves control and efficiency in recycling applications because the operator can cut metal from multiple angles with less machine repositioning.
Choose a fixed shear if you're running a stationary or semi-stationary scrap operation with consistent material flow. Choose a rotating shear if you're doing selective demolition or mobile scrap work, where beams, columns, and rebar come at unpredictable angles and repositioning the machine burns time you don't have.
Used shears typically range from $15,000 for a small fixed unit to over $150,000 for a large rotating shear rated for heavy structural steel, but total cost is more than the purchase price and should also account for maintenance and resale value. Price depends on jaw opening size, tonnage rating, hydraulic compatibility with your carrier, carrier compatibility, and hours on the blades.
Blade wear drives replacement cost more than almost any other factor, and it directly affects performance. A shear with heavily worn or chipped blades needs a rebuild that can run several thousand dollars. Replaceable blades help minimize downtime during maintenance. Ask for blade condition photos and hour meter readings before you buy — a seller who won't provide either is hiding something.
Carrier compatibility is the main sizing issue: shear weight and hydraulic flow requirements determine carrier size, not the other way around. Excavator compatibility is critical for safe and effective operation, especially when matching the shear to the excavator's weight class. A small rotating shear designed for a 20-ton excavator will not perform on a 40-ton machine — the hydraulic flow won't match, and the shear will cycle too slowly or not fully close.
When choosing the right demolition shear, check five specs before you pair it with excavators: operating weight range, required hydraulic flow (GPM), required pressure (PSI), jaw opening, and cutting force. Hydraulic flow and pressure must match shear requirements. Match all five. A mismatch on any one of them means poor cycle times or premature wear on both the shear and the excavator's hydraulic system. Compact mini shears are typically intended for smaller machines up to 10 tons, depending on model and material thickness.
Blade sharpness and pin wear tell you more about a shear's true condition than the paint job. Inspect these five points in person or ask for close-up video:
Blade edges — check for chips, cracks, or excessive rounding
Pivot pins and bushings — excess play means costly rebuild ahead
Hydraulic cylinder — look for leaks or scoring on the rod
Rotation motor (rotating shears only) — listen for grinding during a test cycle
Structural frame — check for cracks near stress points and weld repairs
A shear with 2,000 hours and a documented blade replacement history is a safer buy than one with 800 hours and no paperwork. Run it before you buy it. Any reputable seller lets you test-cycle the shear on real material.
A scrap or demolition shear is only as good as its match to your material, your carrier, and your workload across the selection. Hydraulic demolition shears are built for high-cycle production and scrap processing workloads. Nail down jaw opening, tonnage, and hydraulic requirements before you compare a single price tag. Inspect blades and pins in person, verify hours against paperwork, and test-cycle the unit on real material before it leaves the lot.
Common applications include recycling and vehicle dismantling, and excavator-mounted shears can process ferrous and non-ferrous metals. On active job sites, the right attachment delivers the power needed for efficient steel cutting and helps crews find the right balance of size and features for the work.
Get the match right, and a shear turns hours of manual cutting into minutes while improving productivity in scrap yards and faster scrap processing on the job site. Get it wrong, and you're paying for downtime instead of production. Check the specs, run the test cycle, then buy.
How long do shear blades last?Blade life depends on material hardness and cycle volume, but most blades need resharpening every 500-800 hours and full replacement every 2,000-3,000 hours under heavy use.
Can one shear cut both rebar and structural steel?Yes, if the tonnage rating covers your heaviest cut. Undersized shears struggle with thick I-beams even if they handle rebar, plate, or cable fine — check the jaw's maximum cutting capacity, not just its opening size, because cutting force determines the thickness of steel the shear can process. Some demolition shears can cut steel plate up to 1 inch thick, depending on model and material.
Is a rotating shear worth the extra cost?Choose a rotating shear if your job involves frequent repositioning — selective demolition, mixed-angle cuts — and hydraulic demolition shears are especially useful in recycling applications because rotation improves control when material is coming from awkward angles. Choose a fixed shear if material flow is consistent and repositioning isn't a factor; the cost savings go straight to your bottom line.
What's the biggest mistake buyers make with used shears?Buying on price before confirming the shear matches the excavator's weight class and hydraulic compatibility with the carrier. A cheap shear that doesn't match your excavator's GPM and PSI output cycles slowly and wears out fast, costing more in downtime than the discount saved upfront.