The GQ series steel bar cutting machines are mainstream equipment in construction sites. Their blades must strictly match the machine model specifications; otherwise, faults such as weak shearing, material jamming, and blade chipping are likely to occur. Different models correspond to different maximum cutting diameters, tool holder structures, and mounting hole positions. Therefore, there are systematic differences in blade dimensions (length × width × thickness), material hardness, and hole quantity (single-hole / double-hole / four-hole). Users often cause equipment abnormalities due to mixed use of blades, so clarifying the corresponding relationship is crucial.
Rebar blade Core Comparison of Model-Dimension-Material
Model | Typical Blade Dimension (mm) | Thickness (mm) | Hole Configuration | Mainstream Materials | Key Parameters of Adaptable Machine |
GQ40 | 83×83 / 90×90 | 16–20 | Single-hole, Double-hole | H13, 9CrSi | Cuts Φ6–40mm round steel; Motor power 2.2kW; Overall weight ≈485kg |
GQ50 | 90×90 / 100×100 | 20–28 | Double-hole, Four-hole | H13, CR12MOV | Cuts Φ6–50mm round steel; Motor power 4kW; Overall weight ≈640kg |
GQ60 | 100×100 / 130×130 | 28–30 | Mainly Four-hole | H13, H13K | Cuts Φ6–55mm round steel; Motor power 5.5–7.5kW; Overall weight ≈1200kg |
Notes
• In dimension marking, "90×90×20" means length 90mm, width 90mm, thickness 20mm. Larger numbers indicate higher bearing strength. Due to the need to cut thicker steel bars, GQ60 generally adopts a thickened + four-hole design to enhance rigidity.
• Material selection logic: H13 balances high hardness (HRC52–56) and toughness, suitable for high-frequency impact shearing; 9crsi is cost-effective with excellent wear resistance, making it the first choice for economical applications.
• In actual procurement, GQ40 is commonly available as "83×83×16 single-hole, 2 pieces", GQ50 as "90×90×26 double-hole, 2 pieces", and GQ60 as "130×130×30 four-hole, 2 pieces".
Rebar blade Installation and Compatibility Points
• Do not mix across models: Forcing GQ40 blades into GQ50 tool holders will cause loose fixation and shear unbalance due to hole spacing deviation, accelerating bearing wear.
• Blade gap requirement: The horizontal gap between upper and lower blades must be controlled at 0.2–0.5mm (for GQ40/GQ50) or 0.2–0.8mm (for GQ60). Excessive gap results in incomplete cutting, while insufficient gap intensifies wear.
• Special accessory extension: GQ50/GQ60 support replacement of angle steel-specific blades, but the jaw pad must be removed simultaneously and ordered separately;
Conclusion
GQ40, GQ50, and GQ60 blades have clear gradations in dimensions, thickness, hole quantity, and material. They are non-interchangeable and must be strictly matched to the machine model. GQ40 focuses on portability and flexibility, GQ50 balances performance and cost, and GQ60 specializes in heavy-duty working conditions—choosing the wrong blade not only affects efficiency but may also damage the entire machine's transmission system.
Rebar Cutting Machine Quick Blade Replacement: 5 Safety Steps
Core Principles: Power off and stop completely → Confirm no pressure → Standard disassembly and assembly → Precise adjustment → Test run verification. Avoid pressurized and live electrical operation throughout the process to prevent blade pinching injuries and accidental equipment startup risks.
Step 1: Power off and lock out, completely stop the machine
Turn off the main power supply of the cutting machine, unplug the power cord/switch off the circuit breaker; manually rotate the equipment flywheel to confirm that the blade holder has no inertial movement and is completely stationary, preventing accidental equipment startup.
Step 2: Release pressure, disassemble protection
Loosen the unloading valve of the equipment's hydraulic system (for hydraulic models), completely release the hydraulic pressure inside the blade holder to prevent the blade holder from suddenly rebounding; remove the safety guard and fixing clips at the blade, and clean up rebar scraps and debris between the blade holder and the blade to ensure unobstructed disassembly and assembly space.
Step 3: Standard disassembly, gentle handling
Use a special wrench to loosen the blade fixing bolts (disassemble in a diagonal sequence to prevent deformation of the blade holder), strictly avoid directly striking the blade/bolts with a hammer; during disassembly, steadily support the blade with your hand and place the old blade properly in a non-slip, non-impact area.
Step 4: Precise installation, leveling and gap adjustment
Smoothly fit the new blade to the positioning surface of the blade holder, confirm that the blade installation direction (cutting edge facing the shearing side) is correct, and gradually tighten the fixing bolts in a diagonal sequence (even torque to prevent blade misalignment); adjust the gap between the moving and stationary blades, the conventional rebar cutting gap is controlled at 0.1~0.3mm, a gap that is too large is prone to material jamming, and a gap that is too small is prone to blade wear.
Step 5: Reset protection, no-load test run
Reset and lock the safety guard; after switching on the power, jog the equipment 2-3 times without load, check that the blade holder runs smoothly and the blade is free from jamming/abnormal noise, and after confirming that the shearing action is normal, then perform a rebar test cut. If the test cut is successful, it can be used normally.