Ship Ballast Weights
Kurt Foundry casts ship ballast weights to your exact tonnage and block dimensions, helping naval architects and shipyards hit trim and stability targets precisely.
Precision Mass for Trim and Stability
Ballast weight that’s off by even a few percent can throw off a vessel’s trim and stability calculations. Kurt Foundry casts ballast blocks to your exact tonnage and block dimensions, with every block verified on a certified scale before it ships.
We handle both prototype orders and high-volume shipyard programs, with consistent density piece to piece so your naval architect’s calculations hold true after installation.
What We Customize for You
Every order is cast to your specification, not pulled off a shelf. Here’s what we tailor to your exact application.
Weight & Mass Control
Each block is cast and certified to your target mass so your vessel’s trim and stability calculations hold true after installation.
Block Dimensions
Block length, width, and height are cast to fit your hold, bilge, or keel space exactly.
Lifting Points & Rigging
Lifting lugs are positioned for safe, balanced handling during installation and service.
Envelope-Matched Fit
Blocks are dimensioned to fit precisely into your hold, bilge, or keel envelope without field modification.
Material Grades
Need ductile iron instead of grey? Compare both on our custom iron castings page.
Every ship ballast weights order is cast in the material grade that fits your application and duty cycle.
| Standard / Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Typical Applications |
|---|---|---|---|---|
| ASTM A48 Class 30/40 (Gray Iron) | ≥ 207-276 | N/A (Brittle) | N/A | Standard ballast blocks for trim and stability across most vessel classes. |
Used In These Industries
See how this product fits into the industries we serve.
Where This Product Is Put to Work
Real-world applications our customers rely on.
Naval Architecture & New Builds
Ballast blocks cast to your naval architect’s trim and stability calculations for new-build vessels.
Shipyard Retrofits
Custom block dimensions for retrofitting ballast into existing hulls and hold configurations.
High-Volume Production
Consistent density and weight across large-volume ballast orders on a schedule that matches your build timeline.
How We Manufacture Your Custom Ship Ballast Weights
Ballast weights are cast to your exact target mass and profile, with every unit weighed and verified before shipment.
1. Pattern & Mold Design
We design the pattern and gating system around your target weight and footprint, sized to fit your vessel’s ballast compartment.
2. Sand Molding
Molds are produced in green sand or furan resin sand sized for efficient, high-volume pours.
3. Melting & Pouring
Iron is melted, chemistry-verified, and poured to fill each mold to the correct volume for your target weight.
4. Shakeout & Fettling
Castings are removed from the mold and gates, risers, and flash are ground away.
5. Weight-to-Tolerance Machining
Where your specification calls for a precise mass, weights are trimmed or machined to bring each unit within tolerance.
6. Certified Scale Verification
Every finished weight is verified on a calibrated scale before packaging, with weight documentation available on request.
Quality Control for Ship Ballast Weights
Ballast performance depends on accurate, consistent mass — every weight is verified before it leaves the foundry.
- Certified Weight Verification:Each unit is weighed on a calibrated scale and checked against your target tolerance.
- Dimensional Inspection:Footprint and mounting-hole dimensions are checked against your drawing to confirm fit in the ballast compartment.
- Material Test Reports (MTRs):Spectrometer chemistry documentation is provided with every shipment.
- Visual Inspection:Each weight is visually inspected for casting defects before packaging.
Worldwide Export Shipping — Direct from Foundry
Kurt Foundry exports to customers across North America, Europe, Southeast Asia, the Middle East, and Australia. We manage the entire logistics chain from our foundry floor to your receiving dock.
We offer flexible shipping terms including FOB, CIF, and DDP depending on your destination and preference — a single direct-factory price with full freight transparency.
All ship ballast weights are packaged in ISPM-15 certified fumigated wooden crates with rust-preventative coating and internal blocking to prevent movement in transit.
Ocean Freight
We arrange full-container or LCL ocean freight from Qingdao to ports worldwide — USA, Canada, Europe, Southeast Asia, Middle East, and Australia.
Flexible Trade Terms
We support FOB, CIF, and DDP shipping terms. Choose the arrangement that fits your procurement process and import requirements.
Last-Mile Delivery
Under DDP terms, we arrange customs clearance and inland trucking directly to your facility — available for USA, Canada, and select European destinations.
Export Crating
All shipments use certified fumigated wooden crates with rust-preventative coating and full export documentation.
Why Choose Kurt Foundry for Ship Ballast Weights
Cast, machined, and finished under one roof, engineered to hold the exact spec your application requires.
Precise Weight Distribution
Each block is cast and certified to your target mass so your vessel’s trim and stability calculations hold true after installation.
Envelope-Matched Dimensions
Block length, width, and height are cast to fit your hold, bilge, or keel space exactly, with lifting lugs positioned for safe handling.
High-Volume Production
Our foundry handles large-volume ballast orders with consistent density piece to piece, on a schedule that matches your build timeline.
Frequently Asked Questions
We hold weight within a documented tolerance band and provide a certified scale ticket with every shipment, so trim calculations stay accurate.
Yes, we cast to your exact dimensional drawing, including notched or irregular shapes to fit bilge and keel spaces.
We handle both prototype and high-volume shipyard programs. Send your target tonnage and timeline and we’ll confirm capacity.
Yes, every block ships with a certified scale ticket documenting actual cast weight.
Lead times vary with casting size and volume, but most ballast orders ship within a few weeks of pattern approval.
Ready to Quote Your Ship Ballast Weights?
Send us your drawing or sample and we’ll quote weight, lead time, and pricing within one business day.
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