In-house laboratory capability — serving our own production first, and available for third-party testing when capacity allows.
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A weight-distributing hitch is a “load leveling” hitch. It is a hitch setup mounted on the tow vehicle that uses spring bars and chains under tension to distribute part of the trailer’s hitch weight from the towing vehicle’s rear axle to the towing vehicle’s front axle and to the trailer’s axle(s). It can help reduce trailer sway and hop. Trailer hop can jerk the tow vehicle. Trailer sway is sometimes called “fish tailing”. At high speeds, trailer sway can become dangerous. Most vehicle manufacturers will only allow a maximum trailer capacity of 5,000 pounds (2,300 kg) and 500 pounds (230 kg) of tongue weight without using a weight-distributing hitch. Tow vehicles often have square receiver sockets to accept weight distributing hitches.
Let us know your detail demands and inquiry now.
A tow hitch (or tow bar) is a device attached to the chassis of a vehicle for towing, or a towbar to an aircraft nose gear. It can take the form of a tow ball to allow swiveling and articulation of a trailer, or a tow pin, or a tow hook with a trailer loop, often used for large or agricultural vehicles where slack in the pivot pin allows similar movements. SMI(Sino Machine Industry) towing pintle used worldwide.
SMI tow hitch and tow bar’s main features:
Designed for heavy-duty towing, Tight turning radius, Pintle hook, Optional Ball Adapter, Collapsible legs, 10,000 lb capacity, and safety cables.
Also we offer OEM/ODM tow hitch or tow bar. The tow bar which Sino Machine Industry supplied were produced per customer’s drawings or specifications. All the parts are made in China and working for global machinery industry. SMI Castings Serving the Industrial Markets of the World.
SMI is a professional designer and manufacturer of high-efficiency aluminum dross press equipment for aluminum casthouses worldwide. With over 30 years of experience in aluminum recycling equipment design and manufacture, SMI supplies dross press systems, cooling heads, dross pan sets and dross compression units (DCU) to primary smelters, secondary smelters and metal recycling operations across the Middle East, Europe, India, North America and Asia-Pacific.
SMI dross press equipment and casthouse consumables have been supplied to aluminum producers worldwide and have earned consistent recognition for quality and performance in demanding casthouse environments. SMI has recently expanded its dross pan casting line to include the manufacture of DCU (dross compression units), extending the range of dross processing solutions available to customers.
SMI aluminum dross press systems are engineered to cool hot dross rapidly under hydraulic compaction, arresting oxidation and metal loss within a single automated pressing cycle. In-house metal recovery typically reaches 20–35%, depending on operational conditions including dross free metal content, time elapsed between skimming and pressing, distance from furnace to press, and insulation conditions during transfer.
The global average in-house aluminum recovery from dross processing is approximately 33% — SMI systems are designed to optimise all controllable variables within each installation to approach or exceed this benchmark. 
Dross press systems are available in custom configurations matched to your dross type, generation rate and casthouse layout. SMI supplies three standard model sizes — SMI40, SMI60 and SMI80 — processing 250–700 kg of dross per pressing cycle, with custom capacities available on request.
SMI dross press systems are designed to be practical and cost-effective to own and operate — matched to the actual needs and local conditions of each installation, from high-volume primary smelters to smaller melting and casting facilities.
SMI provides upgrade and improvement services for existing dross recycling equipment. If your current press installation is underperforming — due to worn cooling heads, degraded dross pans, or outdated control systems — SMI can assess your current configuration and deliver targeted improvements that increase metal recovery without requiring full system replacement.
Upgrades are customised to your current equipment and operational requirements. SMI application engineers review the existing installation, identify the limiting factors in recovery performance, and recommend the most cost-effective improvement scope.
The SMI dross press cooling head significantly reduces dross cooling time and fume generation during the pressing cycle. The cooling head incorporates an integrated forced-cooling circuit cast directly into the head body — not machined in afterward — ensuring consistent heat extraction performance and long dimensional stability under repeated thermal cycling.
SMI cooling heads are manufactured from a proprietary material formulation developed by SMI — engineered specifically for thermal shock resistance and dimensional stability under the demanding conditions of continuous casthouse service. This proprietary formulation is the result of over 30 years of material development and operational refinement in aluminum casthouse environments. Cooled and uncooled configurations are available across all geometries, matched to the specific dross pan and press frame of each installation.
SMI provides consulting services on the design and improvement of aluminum dross press systems. SMI aluminum dross pans and sow molds — manufactured from the same proprietary material formulation — deliver consistent quality and durability in high-temperature casthouse service.
Dross before and after processing with SMI equipment — the difference in density, oxide content and recoverable metal content is visible in the compressed aluminum block produced by each pressing cycle.
SMI is one of the most experienced suppliers of aluminum dross press machines and associated castings for aluminum casthouses. Our product range covers the complete dross management workflow — from furnace to finished aluminum block:
SMI is dedicated to providing top-quality aluminum plant equipment engineered to meet the demands of high-temperature casthouse operations. From skimming dross off molten aluminum to pouring it into sows and ingots, every SMI product — dross press, skim blades, dross pan sets, sow molds and ingot molds — is designed to withstand the thermal shocks and stresses of continuous casthouse service.
The combination of SMI’s proprietary thermal shock-resistant material formulation and robust engineering design ensures longevity and dimensional stability across the full service life of each product. SMI solutions are designed to increase aluminum dross recovery yields and reduce material and operating costs — at every scale of operation, from the world’s highest-output primary smelters to smaller facilities where practical, cost-effective equipment makes the difference between viable and unviable dross recovery.
SMI has been supplying aluminum recycling systems and casthouse consumables since 1996, with over 30 years of manufacturing and export experience across legal entities in mainland China, Hong Kong, Southeast Asia, Europe and the United States. Annual mechanical product output exceeds 4,000 metric tons across more than 1,200 product variants.
SMI dross press equipment and casthouse consumables are in active service at primary aluminum smelters across the Middle East, Europe, India, North America and Asia-Pacific, including multiple operations within the world’s highest-output primary aluminum production groups. All supply relationships are subject to confidentiality agreements. Reference accounts are available to qualified buyers under appropriate confidentiality terms.
To discuss your dross press equipment requirements — whether a complete new system, an upgrade to existing equipment, or replacement consumable supply — please contact SMI’s application engineering team. We will respond with a written recommendation and commercial proposal.
Truck and Trailer Parts
(Some of our forklift parts, truck & trailer parts to UK and USA. We respect intellectual property rights, we will not sell our customers’ products to third parties, and these product photos only show our production capabilities. We quote and produce according to the customer’s drawings and technical parameters.)
Also we offer OEM/ODM truck & trailer parts. The truck & trailer parts including spare parts which Sino Machine Industry supplied were produced per customer’s drawings or specifications. All the parts are made in China. SMI (Sino Machine Industry) Castings Serving the Industrial Markets of the World Since 1996.
Main Production:
Precision forged gears， Precision machined gears，Gear-boxes.
Important types of gears:
Spur gear, Helical gear, Double helical gear, Bevel gear, Spiral bevel gear, Screw gear, Mitre gear, Worm gear, Internal gear, External gear, Rack and pinion gear, Herringbone gear, Hypoid gear, Sprocket, Epicyclic gear, Involute spines, Straight sides splines.
Industries Served:
Automotive, Agricultural, General engineering, Recreational vehicles, Power generation, Ship building
Surface Preparation: Nitride， Carbonitride
Material: Gears can be made of various types of materials, including:
Iron-based materials, Nonferrous metals, Plastic materials, Steel, Brass, Bronze, Cast iron, Ductile iron. SMI specializes in materials other than plastic.
The strength of gears differs depending on the type of material, heat treatment or quenching applied.
Independent axle Bridge
The axle is a cylindrical object worn in the middle of the bearing or in the middle of the wheel, but there are also a few parts that are square. Axle bridge is a mechanical part that supports the train wheel to rotate and rotate with it to transmit motion, torque and bending moment. The parts of the machine for rotary motion are mounted on the axle.
Metro traction beam
The metro traction beam is used to realize the connection between the locomotive and the vehicle, the vehicle and the vehicle, and the traction force and the impact force, and the vehicle can keep a certain distance between the vehicle and the vehicle.
Axle box
In railway locomotives and vehicles, set in shaft neck uplink node wheel and steering frame or two axis vehicle body components, referred to as the crankcase. Its function is to transfer the weight of the body and the load to the wheel, the lubrication journal, reduce friction, the running resistance. The axle box device is divided into two types: plain bearing box device and rolling bearing box device. In early twentieth Century, the rolling bearing box device was used in the early stage of locomotive and rolling bearing. China railway passenger cars and diesel locomotives and electric locomotives all have used rolling bearing box.
