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A chain hoist is a mechanical manual device for vertical load lifting. Its standard capacity ranges from 0.5 to 20 tons. The core mechanism operates on a high-ratio wheel and axle system. Gears are manufactured from hardened chrome-molybdenum steel. This design ensures a mechanical efficiency exceeding 85%. The load chain is Grade 8 alloy steel with a galvanized coating. The hook is forged steel and proof-tested to twice the nominal capacity. An automatic load-sensitive brake prevents free fall of the load. The main body is high-strength aluminum alloy or cast steel.

Unit weight for a 1-ton model is approximately 16 kg. Standard chain lengths are typically 1.5 or 3 meters. The permissible pull angle from the vertical axis is a maximum of 30 degrees. The manual force required to lift a 1-ton load is about 36 kgf. It is designed for mounting on I-beams with flange widths of 70 to 250 mm. Travel rollers are hardened steel with anti-wear coatings. The hoist is operational in temperatures from -20°C to +150°C. Periodic lubrication of bearings and gears every 50 operating hours is mandatory.


arya-boxel-co	02155414729 \| 55414468

arya-boxel-co

Iran

02155414729 | 55414468

polift

A chain hoist is a mechanical lifter utilizing two independent chain sets. The load chain is Grade 8 alloy steel with 800 N/mm² tensile strength. The hand chain is made from carbon steel with a circular cross-section. Gears are case-hardened steel with a hardening depth of 0.8 mm. The standard mechanical advantage ratio is 28:1. This ratio reduces user input force to approximately 32 kgf for a 1-ton load. The automatic brake is a load-sensitive disc type system. It securely locks the load at any release angle of the lever.

Standard capacity starts at 0.5 tons and extends to 20 tons. Overall dimensions for a 2-ton model are about 30 x 20 x 15 cm. The units weight is equivalent to 25% of its nominal capacity. Standard load chain length is 3 meters with 6 and 9-meter options. The maximum pull angle for the hand chain is 30 degrees from vertical. It mounts onto structural beams with a minimum yield strength of 235 MPa. Its permitted operating temperature ranges from -20°C to +120°C. Mandatory periodic inspection is required every three months.