What is the load-bearing capacity of this guard plate when subjected to impact?

The 6mm EN 10025 S275JR steel plate has a yield strength of 275 MPa and a tensile strength of 430-580 MPa. In a drop test simulating a 50kg mass falling from 1m, the plate showed no permanent deformation, with a maximum deflection of 2mm. The continuous weld seam, inspected to ISO 5817 level B, ensures the assembly can withstand impact energies up to 500 J without failure. For applications with higher impact risks, we recommend upgrading to an 8mm variant or adding reinforcing ribs. Always verify that the mounting bolts are torqued to 45 Nm to maintain structural integrity.

How does the galvanized coating perform in corrosive environments?

The hot-dip galvanized coating per ISO 1461 provides a minimum zinc thickness of 45μm, which corresponds to a salt spray life of 500 hours (ASTM B117). In real-world conditions, this translates to over 10 years of maintenance-free service in C3 corrosivity categories (urban and industrial atmospheres with moderate sulfur dioxide). For C4 or C5 environments (coastal or heavily polluted), we recommend additional powder coating or opting for a stainless steel version. Regular inspection every 12 months is advised to check for coating damage; touch-up with zinc-rich paint can extend the coating life further.

Can this guard plate be customized for different counterweight sizes or mounting patterns?

Yes, as a weldment, this guard plate can be customized to accommodate various counterweight dimensions and mounting configurations. Our engineering team can adjust the plate size (e.g., 600mm x 400mm for 25kg blocks), thickness (4mm to 10mm), and hole patterns (e.g., slotted holes for adjustability). Customization typically adds 5-7 business days to lead time and may require a minimum order quantity of 50 units. We also offer material substitutions such as stainless steel 304 or 316 for highly corrosive environments. Please provide a drawing or sample for accurate quoting.

Counterweight Guard Plate (Weldment)

6mm Mild Steel Welded Guard Plate for 15kg Counterweights – 500x300mm

The counterweight guard plate (weldment) is a fabricated steel assembly designed to enclose and protect counterweight blocks in industrial machinery. This specific unit is constructed from 6mm thick EN 10025 S275JR mild steel, measures 500mm by 300mm, and weighs 15kg, making it suitable for medium-duty applications.

Material

Mild Steel (EN 10025 S275JR)

Weight

15kg

Weld Type

MIG Welded, Continuous Seam

Surface Finish

Hot-Dip Galvanized (ISO 1461)

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How Does the 6mm Welded Guard Plate Enhance Counterweight Safety?

The Counterweight Guard Plate (Weldment) is a dedicated safety component engineered for industrial machinery that utilizes 15kg counterweight blocks. Fabricated from 6mm EN 10025 S275JR mild steel, this weldment offers a yield strength of 275 MPa, providing robust resistance against impact and deformation. The 500mm x 300mm plate is MIG-welded with a continuous seam, ensuring a load-bearing capacity that exceeds typical operational loads by a factor of 1.5. The hot-dip galvanized coating, applied per ISO 1461, delivers a minimum zinc thickness of 45μm, effectively protecting against corrosion in harsh environments. This guard plate is not merely a cover; it is a structural element that maintains the integrity of the counterweight assembly under dynamic conditions.

Typical applications for this 6mm guard plate include forklift counterweights, crane outrigger counterweights, and conveyor tensioning systems. In forklifts, the plate prevents operators from inadvertently contacting the counterweight during maintenance, reducing workplace accidents. For cranes, it shields the counterweight from debris and weather, extending service life. The 15kg weight of the plate itself is optimized for easy handling during installation without compromising strength. Industries such as logistics, construction, and manufacturing benefit from this product's ability to meet safety regulations (e.g., ISO 3691-1 for industrial trucks) while minimizing downtime due to damage or corrosion.

Compared to standard 4mm guard plates in the same series, this 6mm version offers 50% greater thickness and a 30% higher impact resistance, making it suitable for heavy-duty cycles. The 500mm x 300mm size is specifically tailored for 15kg counterweights, whereas larger plates (e.g., 600mm x 400mm) are available for 25kg blocks. This precise sizing eliminates the need for on-site modifications, reducing installation time by approximately 40%. Additionally, the welded construction eliminates fasteners that could loosen under vibration, ensuring maintenance-free operation. For applications requiring even higher corrosion resistance, an optional stainless steel variant (grade 304) is available, though the galvanized version remains the cost-effective choice for most indoor and outdoor industrial settings.

Continuous MIG weld seam provides a tensile strength of 400-500 MPa, ensuring the guard plate withstands vibrations up to 10g.
Hot-dip galvanized coating per ISO 1461 offers a salt spray test life of 500 hours, ideal for humid or coastal environments.
Precision laser-cut profile with ±0.5mm tolerance guarantees a snug fit over 15kg counterweights, preventing rattling and wear.

Core Technical Features & Quantified Advantages

STEP 1

6mm EN 10025 S275JR Steel Construction

The guard plate is fabricated from 6mm thick mild steel with a yield strength of 275 MPa and tensile strength of 430-580 MPa. This material grade ensures excellent weldability and formability, allowing for a continuous seam that distributes stress evenly. Compared to thinner 4mm plates, the 6mm thickness provides 2.25 times the bending stiffness, reducing deflection under load. The steel is sourced from certified mills and complies with EN 10025-2, guaranteeing consistent mechanical properties for critical safety applications.

STEP 2

Continuous MIG Welded Seam for Vibration Resistance

The weldment features a continuous MIG weld along all joints, creating a monolithic structure that eliminates gaps where debris could accumulate. The weld seam is inspected to ISO 5817 quality level B, ensuring no cracks or undercuts. This construction withstands vibration frequencies up to 200 Hz and amplitudes of 1.5mm, typical in forklift and crane operations. Unlike bolted assemblies, the welded design prevents loosening over time, reducing maintenance costs by an estimated 30% over the product's lifecycle.

STEP 3

Hot-Dip Galvanized Finish (ISO 1461)

The entire guard plate undergoes hot-dip galvanization per ISO 1461, with a zinc coating thickness of at least 45μm. This finish provides cathodic protection, meaning even if the coating is scratched, the zinc will sacrificially corrode to protect the steel. Salt spray testing (ASTM B117) confirms a corrosion resistance of 500 hours before red rust appears. This makes the plate suitable for outdoor use in coastal or industrial environments where humidity and salt exposure are common, extending service life to over 10 years.

STEP 4

Precision Fit for 15kg Counterweights (500x300mm)

The 500mm x 300mm dimensions are specifically engineered for standard 15kg counterweight blocks used in forklifts and cranes. Laser cutting achieves a dimensional tolerance of ±0.5mm on all edges, ensuring a snug fit that minimizes movement and noise. The plate includes pre-drilled mounting holes (Ø10mm) at 400mm centers, compatible with M10 bolts for secure attachment. This precision reduces installation time by 40% compared to generic plates that require on-site drilling or shimming.