Category: Clay Sand Casting
Zhaoyuqi Machinery is a Qingdao-based OEM foundry producing customized cast iron hardware for machinery, construction, agricultural and electrical projects. With more than 20 years of sand casting experience, we make connecting hardware, mounting brackets, structural castings and general iron hardware parts to customer drawings in ductile iron and grey iron, on a fully automatic clay sand production line.
Our cast iron hardware range covers the small-to-medium structural and connecting components that equipment builders and contractors source regularly: brackets and supports, clamp and fitting bodies, mounting feet, connector housings, threaded fittings, pole and pipe hardware, and bespoke iron parts where a standard off-the-shelf bracket will not fit the design. Every piece is produced to your 2D or 3D drawing, with material, tolerance, surface finish and machining called out on the order.
Molding process: Clay sand casting on a fully automatic production line, stable for medium and large batches.
Materials: Ductile iron (nodularity rate at least 90%) for high-strength and impact-load hardware; grey iron for damping and wear-resistant parts.
Part size: Sand-cast hardware from 0.5 up to 50 kg, a comfortable range for the automatic line.
Charge material: We melt pig iron charged direct from the mill, with every incoming lot verified before the furnace.
Weight range: 0.5-50 kg per piece on the clay sand line; up to 2000 kg per piece by lost foam casting for larger hardware.
Dimensional control: Automatic molding keeps wall thickness and bolt-hole spacing consistent; finish machining on CNC centers closes the final tolerance.
Wall thickness: Typical 6-25 mm, adjustable per drawing where ribs and bosses are needed.
Surface: As-cast after shot blasting; painting available for outdoor or painted-assembly use.
Mounting brackets, feet and supports for industrial machinery and pump sets.
Connecting hardware and brackets for agricultural equipment.
Structural iron hardware for building, framing and support systems.
Clamp bodies, connector housings and fitting bodies for pipe and electrical installations.
Replacement and OEM hardware parts where cast ductile iron gives better strength than fabricated steel.
Power and distribution: Clamp bodies, pole brackets and connector housings for overhead and substation hardware.
Rail and transit: Mounting brackets and support castings for signalling and equipment cabinets.
Agricultural machinery: Linkage brackets and heavy-duty feet for tractors and implements.
Construction: Embedded parts, base plates and structural connectors for steel-framed buildings.
Your drawing arrives and we confirm feasibility, material and tolerance before quoting. We then build the tooling and cast a first sample marked to your inspection points; once you approve it, bulk production runs on the automatic line and ships in wooden export cases. Because tooling, sample, casting and machining stay in one foundry, your drawing never passes through a middle shop and corrections take days, not weeks.
Share a 2D drawing, a 3D model or even a sample part. Tell us the annual quantity, target material (ductile iron or grey iron), required coating and any machining notes; we will reply with a price, sample lead time and production schedule.
Every cast iron hardware part we ship is 100% inspected before packing, covering dimensions, surface condition and casting integrity. Our drawing-based OEM workflow keeps your confidential design from tooling through sample confirmation to bulk production, with regular lead time within 30 days and foundry capacity above 10,000 tons per year on the automatic clay sand line. Send your drawing with an enquiry and we will quote it.
Hardware buyers usually discover mold-to-mold variation the hard way: a batch where every tenth bracket needs re-drilling. This is the problem automatic clay sand molding exists to solve. On our line, each mold is made by the same machine, with the same sand recipe, squeezed to the same pressure — so casting number 4,000 matches casting number 4 in the ways that matter: wall thickness, bolt-hole position and flatness of mounting pads.
Consistency is measured, not assumed. First article castings get a full dimensional report; ongoing production is sampled against the same drawing, and our foundry team watches the sand system — moisture, compactability, temperature — because sand drift is where variation actually starts. If a dimension on your drawing is functionally critical, name it, and it goes into the gauge routine on every batch rather than the sampling plan.
There is a scale consideration too. The automatic line earns its keep from medium and large batches; for one-off or tiny lots, manual molding may price better. Tell us the annual picture rather than the first order alone, and we will put the part on the route that fits its whole life, not its first shipment.
Hardware pricing does not fall smoothly with volume — it steps. The first step is pattern amortization: the tooling cost spread across the first order disappears from later orders. The second is molding efficiency, where a batch large enough to run without re-setting the line spreads setup across more pieces. The third is finishing, where tumbling, blasting and inspection batches become more efficient per piece.
In practice, a bracket ordered 200 at a time costs noticeably more per piece than the same bracket ordered 2,000 at a time, even though the casting is identical. If your consumption is steady, the cheapest structure is usually an annual blanket order with scheduled releases — the foundry plans one production run per release and you carry less stock than a single large order would require.
Cast iron hardware is tough, but its corners chip and its machined faces rust. Packing decisions follow the destination: wooden cases for heavy brackets, cartons for light hardware, and rust-preventive treatment on any machined or tapped feature. Pieces are blocked inside the case so they cannot strike each other in transit — movement, not weight, causes most arrival damage.
Storage at your end matters as much. Cartons stacked in a humid yard will transfer moisture to the castings inside, and a galvanized surface can show white storage stain that looks like a coating failure but is not. If your site stores outdoors, ask for a heavier case and desiccant, and keep cases off the ground. Those two habits prevent most of the claims we see, and none of them are the casting's fault.
Hardware usually has threads somewhere, and how they are made affects both price and service life. Cast threads are only sensible on coarse, non-critical features — casting cannot hold the profile accuracy a fastener needs. Drilled and tapped holes are the normal route: the hole is cast undersized, drilled to the tapping diameter, then tapped on a machine so the thread is concentric with the hole. On galvanized hardware, threads are cut after dipping or masked during it, because a coating inside the thread changes the fit and crews will not get a bolt started at height.
Two drawing details save money here. Specify thread depth rather than "through" where a blind hole works, since a blind tapped hole costs less than drilling deeper than necessary. And consolidate thread sizes across a part family — every additional size is a tooling change on the line and a chance for the wrong tap to be loaded.
Typical hardware walls of 6–25 mm run comfortably; thinner or thicker sections are adjustable with ribs and bosses where the drawing needs them. Extreme sections get reviewed at quotation.
Yes — parts are packed and labelled per item number with quantity counts checked at crating. If your parts look alike, send us the distinguishing feature and we add a visual check before packing.
Patterns are stored and maintained for repeat orders, and drawings stay with the tooling record. Reorders reference the original approval sample, so the part you reorder is the part you approved.
With tooling on the shelf, repeat releases typically schedule within the standard production lead time without the pattern-making step.
Yes. Ductile iron suits hardware that sees impact or tightening loads; grey iron suits static hardware where damping and cost matter. We cast both on the same line.
Cast-in lettering, stamped numbers or labels, depending on the part and your preference. Cast-in marking is free at the pattern stage and permanent in service.
Professional technical research and development team to provide customers with the best solution.
Jimo District, Qingdao City, Shandong Province, China
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