Calibration Test Weights
Kurt Foundry casts calibration and test weights for scale manufacturers and metrology labs, poured to tight mass tolerances and finished for accurate, repeatable calibration.
Accuracy You Can Certify
A calibration weight is only useful if its mass is trustworthy. Kurt Foundry pours calibration and test weights close to net weight, then precision-machines and finishes each piece to hit your required accuracy class.
We work with scale manufacturers and metrology labs on both single-piece prototypes and full production sets, with consistent density piece to piece.
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.
Mass Class Accuracy
Castings are poured close to net weight, then precision machined and trimmed to hit your required accuracy class.
Shape & Dimensions
Cylindrical, rectangular, or custom test-block shapes and knurled handle dimensions are cast to your spec.
Certification Marking
Cast or engraved weight, class, and lot markings are applied to your placement and format spec, tying each piece back to its Material Test Report.
Surface Finish
A smooth, consistent machined finish minimizes surface irregularities that could affect mass measurement.
Material Grades
Not sure which iron grade fits? Our custom iron casting guide compares grey and ductile iron side by side.
Every calibration 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 test weights for general scale calibration and metrology use. |
| ASTM A536 65-45-12 (Ductile Iron) | ≥ 448 | ≥ 310 | ≥ 12 | Higher-durability weights for frequent handling in industrial calibration programs. |
Where This Product Is Put to Work
Real-world applications our customers rely on.
Scale Manufacturing
Test weight sets cast for scale manufacturers to calibrate and certify new equipment before it ships.
Metrology Labs
Certified-accuracy weights for laboratories performing routine and NIST-traceable calibration work.
Industrial QA Programs
Durable, frequently-handled weights for in-house quality assurance and scale verification programs.
How We Manufacture Your Custom Calibration Test Weights
Calibration weights are cast, machined, and mass-adjusted to meet exact tolerance classes — traceable to certified reference standards.
1. Pattern & Mold Design
We design the pattern to your target nominal mass and shape, sized with enough machining allowance to reach exact final mass.
2. Sand Molding & Pouring
Molds are poured in grey iron, chemistry-verified by spectrometer for consistent density.
3. Shakeout & Rough Machining
Castings are removed from the mold and rough-machined to bring each weight close to its nominal mass.
4. Precision CNC Finishing
Weights are CNC-finished to final dimension, controlling density and surface finish for a repeatable, stable mass.
5. Certified Mass Adjustment
Each weight is fine-adjusted — by drilling or material addition — to bring it within your specified tolerance class.
6. Traceable Calibration Verification
Final mass is verified on a certified reference scale, with documentation traceable to national measurement standards on request.
Quality Control for Calibration Test Weights
Accuracy is the entire product — every weight is verified against certified reference standards before it ships.
- Certified Mass Verification:Each weight is checked on a calibrated reference scale to confirm it falls within your specified tolerance class.
- Surface Finish Inspection:Surface finish is inspected to prevent corrosion or wear that could shift mass over time.
- Dimensional Inspection:Overall dimensions and handle or lifting features are checked against your drawing.
- Material Test Reports (MTRs):Chemistry and density documentation are available for full traceability.
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 calibration test 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 Calibration Weights
Cast, machined, and finished under one roof, engineered to hold the exact spec your application requires.
Tight Mass Tolerance
Castings are poured close to net weight, then precision machined and trimmed to hit your required accuracy class.
Stable, Uniform Density
Consistent pour quality minimizes internal voids, so mass stays stable and repeatable across the full set.
Custom Shapes and Marking
Cylindrical, rectangular, or custom test-block shapes are available, with cast or engraved weight and lot markings.
Frequently Asked Questions
We machine and finish each weight to hit your required accuracy class, verified on a certified scale before shipment.
Yes, we cast rectangular and custom test-block shapes to your drawing in addition to standard cylindrical designs.
Yes, each weight or set can be supplied with a certificate of calibration referencing its lot and Material Test Report.
We quote both single-piece prototypes and full production sets. Send your target quantity and we’ll confirm pricing.
Lead times vary with quantity and finish requirements, but most orders ship within a few weeks of pattern approval.
Ready to Quote Your Calibration Test Weights?
Send us your drawing or sample and we’ll quote weight, lead time, and pricing within one business day.
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