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Lever Block

Import and distribution of chain polyphs made in Japan, Germany, Korea and China in Kariz industrial equipment.

Chain polylift for sale
Selling manual polylift
Selling polylift 800 kilos
Sale of polylift 1.6 tons
Sale of polylift 3.2 tons
Sale of polylift 6.3 tons

Polylifts are a device designed to pull the load on the surface and lift it at different angles. The resulting force for this operation is created through hand force and causes the load to move through the handle installed on the puller to the steel chain through which the tensile force is transferred to the load. Polylifts are available in common tonnages of 0.8 tons - 1.6 tons - 3.2 tons - 6.3 tons.

In polylifts, steel chains with G80 steel grade are used, which have a high percentage of carbon and have high surface hardness and wear. Therefore, the service life of the chain polylift is higher than that of the towed polylifts. In the production of polylift connecting chain, which has a minimum tensile strength of 550 N/mm2, thermal hardening is used to provide high tension and security in the connection.


The lifting industry has witnessed significant advancements over the years, with various tools and equipment being developed to enhance efficiency and safety. Among these innovations, the lever bl

china vital 1 ton chain block

The 1-ton manual chain hoist, VITAL design, is a reliable mechanical lifting device for handling loads in industrial, workshop, and construction environments, operating with a simple mechanism without the need for electricity or hydraulics. This hoist features a durable steel body with anti-rust and wear-resistant coating, ensuring consistent performance against impact and harsh weather conditions. Its internal system consists of heat-treated steel gears with high surface hardness typically in the 50–60 HRC range and a safety factor of 4:1, allowing it to safely handle a rated load of 1000 kg. The automatic brake mechanism, equipped with wear-resistant friction plates, ensures secure load holding at any height and prevents sudden load release. Due to its compact design and lighter weight compared to similar models, this hoist is easy to transport and install in various worksite locations.

The load chain of the 1-ton manual chain hoist, VITAL design, is typically made from alloy manganese steel with a **G80** grade, compliant with **EN 818-7** standards for lifting applications. The chain size is generally **6 mm**, with a nominal tensile strength of approximately **800 MPa**, capable of withstanding both shock loads and long-term use. The chain surface is protected with a bl

Lock nut

Prevailing torque lock nuts are made from Grade 5 or 8 carbon steel with hot-dip galvanized or dichromate coating. Their common inner diameter ranges from M3 to M24 per ISO 7040 standard. The total nut height is typically 0.8 to 1.5 times the nominal diameter. The locking element features an integrated washer or a nylon-6,6 ring with 30% glass fiber. The operational temperature range for this polymer ring is -40 to +120°C. The minimum breakaway torque after locking is 0.5 to 1.5 times the nominal tightening torque. The steel body hardness reaches 70 to 100 Rockwell B after heat treatment. Coating thickness on the body is between 8 and 12 microns. This coating ensures corrosion resistance for up to 500 hours in salt spray tests.

The nut structure consists of a hexagonal base and an integral locking section. The internal nylon ring typically covers 180 to 360 degrees of the thread circumference. The effective diameter of the polymer ring is about 1.1 times the base thread diameter. This design creates a radial pressure of 50 to 100 MPa on the screw. The recommended tightening torque with a torque wrench is between 5 and 400 Nm. Grade 8 nuts maintain their locking capability under vibrations of 10 to 2000 Hz. The tensile strength of these nuts ranges from 520 to 830 MPa. The int

chinese 5 ton chain block

**Paragraph 1 Technical Specifications of 5-ton Vital Chain Hoist – Chinese Model:**
The 5-ton Vital VITAL manual chain hoist from China is designed for heavy-duty industrial applications with a precise load capacity of 5,000 kg. It features a high-carbon steel chain with 800 MPa tensile strength and hardened-tooth gear mechanisms. The standard chain length is 3 meters, extendable up to 6 meters. The body is constructed from impact-resistant steel with an anti-corrosion epoxy coating. A dual-action centrifugal brake system ensures operational safety. The unit weighs 28 kg and operates within a temperature range of -25°C to +60°C. This model complies with ISO 9001, CE, and GS standards.

**Paragraph 2 Comparison with Japanese Original Product:**
Japanese hoists like KITO’s 5-ton models use alloy steel with 1,000 MPa strength and chrome-molybdenum chains for enhanced durability. Manufacturing precision in Japanese units reaches ±1%, compared to ±2% in the Chinese Vital model. The braking system in Japanese hoists carries TUV certification, while the Chinese version meets only CE standards. Japanese hoists weigh around 25 kg and operate from -30°C to +70°C. Pricing for Japanese hoists is 40% higher than the Chinese Vital model, but they come with a 5-year warrant

chinese 3 ton chain block

The 3-ton manual chain hoist, Chinese VITAL design, is engineered for the safe handling of heavy loads in industrial sites, workshops, and construction projects. The unit features an alloy steel body with an anti-rust and wear-resistant coating, ensuring long service life. Its power transmission system includes heat-treated steel gears with a surface hardness of approximately 55–60 HRC and lubricated bearings to reduce friction. The hoist has a rated capacity of 3000 kg and a standard lifting height of 3 meters, making it suitable for various applications. The net weight is approximately 28–32 kg, which, despite the high capacity, allows for relatively easy transport and installation.

The load chain of this hoist is made from manganese alloy steel, grade G80, and meets EN 818-7 standards for heavy lifting applications. The chain size is typically 10 mm, with a tensile strength of around 800 MPa, capable of handling both dynamic and static loads. The chain surface is treated with black phosphate or galvanized coating for enhanced corrosion resistance. The hoist usually has a safety factor of 4:1, which in static tests means withstanding at least 12,000 kg before failure. These features make this model a reliable choice for industrial and heavy-duty operations.

Standard, Locking, and Washer-Integrated Nuts

Standard hex nuts are manufactured from Grade 5, 8, or 10 carbon steel per ISO 898-2. Their nominal height is 0.8 times the bolt diameter. Production tolerance class is typically Class B medium or Class C coarse per ISO 4759-1. Locking nuts incorporate vibration-damping mechanisms. The most common type is a nylon insert nut with a PA 6-6 capsule, heat-resistant to 120°C. Metallic types function via elastic deformation or a prevailing torque design e.g., distorted thread. These nuts must retain over 60% of initial clamping torque in standard vibration tests.

Washer-integrated nuts flange nuts feature a monolithic washer with an outer diameter approximately 1.7 times the nominal diameter. The integrated washer thickness typically ranges from 1 to 3 mm. This design improves pressure distribution by up to 40% and protects joint surfaces. For specific applications, slotted castle nuts for cotter pins and closed cap nuts are available. Common anti-corrosion coatings include hot-dip galvanizing, dacromet, and zinc flake. These coatings provide corrosion resistance for 480 to 1000 hours in salt spray testing. All nuts must meet the mechanical and dimensional requirements of ISO, DIN, or ANSI/ASME standards.

Chain block G80 chain

The G80 chain for chain hoists is a specialized industrial product designed for load lifting and handling in workshops and industrial environments. This chain is made from high-strength alloy steel and undergoes precise heat treatment and annealing to achieve high tensile strength and long-lasting durability. Standard link sizes typically range from 6 mm to 32 mm, with load capacities from 1 to 6.3 tons depending on size. A minimum safety factor of 4:1 is maintained. The engineered link design ensures uniform stress distribution, reducing the risk of breakage and guaranteeing safe, reliable operation.

Structurally, the G80 chain features forged links resistant to wear and mechanical fatigue. The surface is typically protected with anti-corrosion coating, industrial paint, or galvanization, making it resistant to moisture and corrosive environments. This chain is suitable for use in manual hoists, overhead cranes, and heavy-duty pulling and lifting systems. Easy installation, high flexibility, and resistance to extreme stress are key advantages. Due to its durability and safety, the G80 chain is widely used in construction, oil and gas, mining, and industrial workshops.

rotor pump block

The rotor pump block is made of high-strength alloy steel and can withstand operating pressures up to 350 bar and temperatures up to 120°C. The block measures 180 millimeters in length and 95 millimeters in outer diameter, allowing precise installation on the pump shaft and connection to the rotor. The internal design includes precise lubrication channels and polished surfaces to reduce friction between components. The block has been tested to withstand internal burst pressures up to 500 bar and offers mechanical fatigue resistance exceeding 15,000 operating hours. A corrosion-resistant coating and high wear resistance increase the overall service life of the rotor pump system.

The rotor pump block can be quickly mounted on industrial hydraulic pumps and heavy machinery. It weighs 2.5 kilograms, and its millimeter-precision design facilitates easy replacement and maintenance. Accurate operating pressure prevents oil leakage and rotor damage. Lubrication channels are designed to transfer oil flow up to 180 L/min without pressure loss. Stable performance under vibration and shock maximizes the efficiency and lifespan of the hydraulic system.

HAND CHAIN BLOCK

Manual chain hoists are typically constructed from structural carbon steel ST37 or ST52 with tensile strength of 370 to 520 MPa. Their standard lifting capacity ranges from 0.5 to 20 tonnes. The main boom is often telescopic with a maximum length of 6 meters. The lifting system consists of a gear and an alloy steel chain, Grade 8, with a minimum breaking strength of 800 MPa. The gear ratio in the manual mechanism is designed between 1:15 and 1:30 for mechanical advantage. The base is equipped with cast iron wheels, 150 to 300 mm in diameter. These wheels can withstand a static load up to 4 times the rated capacity.

The hoist structure features a welded H-shaped or triangular frame base. The boom angle is typically adjustable up to 75 degrees. Safety is ensured by mechanical locks at joints and an automatic load brake on the drum. The steel wire rope is of type 6x19 with a steel core and a minimum safety factor of 5:1. The units self-weight ranges from 50 to 400 kg depending on capacity. An epoxy or galvanized coating increases corrosion resistance to over 500 hours in salt spray test. Ideal load positioning accuracy is within ±2 cm.

hydraulic block

The multi-stage hydraulic block is an advanced system designed to divide pressure and transfer fluids through multiple separate sections. These blocks are typically made from high-quality stainless steel or aluminum, with operating pressures ranging from 100 to 350 bar. The flow capacity of these blocks depends on the design and number of stages, typically ranging from 50 to 200 liters per minute. Each stage has its own control valves and pressure relief ports, allowing for precise fluid flow management. Additionally, high-precision filtration systems are used to prevent particulate contamination inside the block.

The structural design of the multi-stage hydraulic block includes standard piping and fittings such as 1/2 to 1-inch high-pressure hoses. For stable performance, these blocks are equipped with cooling and heating systems. A digital pressure and temperature control system, along with accurate sensors, facilitates monitoring of block performance. These blocks are used in various industries, including automotive, heavy machinery, and oil and gas equipment, operating optimally under high-pressure and temperature conditions.

locking cap DN 250

Ground concrete pump spare parts are made from stainless steel alloys with a surface hardness of 55-60 HRC, providing high wear and pressure resistance. Standard dimensions include inner diameters of 25-150 mm and lengths of 100-500 mm, specifically designed for ground concrete pumps. Each part is CNC machined with ±0.02 mm precision, and a 5-micron nano-ceramic coating enhances durability and corrosion resistance. The tensile strength of parts ranges from 850 to 950 MPa, with a yield point of 700-780 MPa. Parts perform efficiently in operating temperatures between -30 and 250°C.

Washers, connections, and rings for ground concrete pumps are produced according to ISO 9001 standards with ±0.01 mm accuracy to prevent vibration and leakage. Each part weighs 1-10 kg, and its design ensures uniform pressure distribution across all surfaces. Contact surfaces with concrete and lubricants have friction resistance ≤0.08 μm. Dynamic fatigue tests show over 1 million cycles without permanent deformation. Moisture-proof and shock-resistant packaging ensures part safety during long-distance transportation.

2D chain block

The dual-function manual chain hoist is a widely used mechanical device for lifting and pulling loads in industrial and workshop environments. It is designed with a rated capacity ranging from 0.5 to 3 tons and supports both lever and chain manual mechanisms simultaneously. The load chain length typically ranges from 1.5 to 3 meters and is manufactured from alloy steel grade G80 or G100. The minimum safety factor of the chain is 4 to 1. Operator effort is optimized to reduce required force while increasing mechanical efficiency. These features ensure safe and precise operation.

Structurally, the dual-function manual chain hoist features a robust steel body with anti corrosion coating. An automatic mechanical brake system prevents sudden load dropping. The upper and lower hooks are forged from high strength steel and equipped with safety latches. The hoist can be used vertically for lifting and horizontally for pulling operations. Depending on capacity, the unit weight ranges from 10 to 28 kilograms. This hoist is a reliable choice for workshops, construction sites, industrial maintenance, and assembly lines.

VITAL Manual chain block

The VITAL manual chain hoist is a high-precision mechanical lifting tool designed for moving heavy loads in workshops and industrial environments. Its body is made of durable alloy steel with a powder-coated finish, ensuring resistance to impact and corrosion. Load capacity ranges from 0.5 to 5 tons, with standard chain lengths of 1.5 to 3 meters. The industrial gear system, with gear ratios from 4:1 to 6:1, allows force multiplication and reduces operator effort. The steel chain is hardened and coated with chrome or galvanization for anti-rust and wear resistance.

Structurally, the VITAL manual chain hoist includes top and bottom hooks with safety latches and an automatic mechanical braking system to prevent load drop. Gears and load pins are made of hardened steel, capable of withstanding pressures between 1500 and 3000 N/mm². Ergonomic handles and rotation axes reduce operator fatigue during extended use. This hoist is widely used in workshops, production lines, warehouses, and construction sites, providing stable and safe operation within temperatures from −20°C to +50°C.

5 ton chinese vital chain block

This hoist is designed for vertical lifting of loads up to 5 tons by hand. The load chain has a minimum safety factor of 4 to 1. The chain is made from Grade 8 alloy steel with a tensile strength of 800 N/mm². Gears are made from hardened steel with precision machined teeth. The design provides a standard gear reduction ratio of 30 to 1. This ratio reduces required user force to approximately 34 kgf. The body is constructed from quality cast steel with minimum tensile strength of 400 MPa. The hook is forged steel, proof-tested to 12.5 tons per standard.

The automatic brake system is mechanical and load-sensitive. It prevents uncontrolled descent even if the lever is released. Galvanized roller bearings are used for smooth operation in harsh environments. Unit weight typically ranges from 20 to 25 kg depending on chain length. The standard chain length is 3 meters. Options for 6 and 9 meters are also available. This hoist is suitable for use in temperatures from -20°C to +150°C. Periodic lubrication of all moving parts is essential for optimal performance.

Three automatic locking systems, Rahm Elman 1-13

The Roem automatic locking chuck model 1-13 from Germany offers clamping accuracy of less than 0.015 millimeters, designed for tools with diameters from 1 to 13 millimeters. Its body is made of hardened steel with a corrosion-resistant coating and weighs approximately 1.2 kilograms. The overall length of the device is 140 millimeters, with a body diameter of 100 millimeters. The maximum permissible rotational speed reaches up to 6000 RPM. The automatic locking mechanism with durable springs allows quick tool changes without additional tools and ensures high safety during operation.

This chuck is manufactured according to DIN 6349 and DIN 6350 standards, suitable for use on both CNC and manual lathe machines. The replaceable hardened jaws increase clamping precision and reduce vibration during turning operations. The engineered structure guarantees long service life and stable performance in industrial environments. The Roem automatic locking chuck 1-13 from Germany is a professional choice for precise turning and sensitive industrial applications.