QXG250 Single Guide Overhead Conveyor Chain

Hangzhou Ocean Industry Co., Ltd. is one of the most experienced manufacturers and suppliers of QXG250 Single Guide Overhead Conveyor Chain in China. Welcome to wholesale customized QXG250 Single Guide Overhead Conveyor Chain at competitive price from our factory. Good service and quality products are available.

 

 

Hangzhou Ocean Industry Co., Ltd. supplies the QXG250 Single Guide painting line chain direct from our Hangzhou production facility. We offer wholesale factory-direct pricing, custom specification engineering, and full technical support for your overhead conveyor project.

 

When production output scales beyond what a 200mm-pitch overhead chain can support, the QXG250 single guide conveyor chain offers the logical next step. Designed around a 250mm link interval, this chain creates wider spacing between suspension points-critical for conveying oversized parts such as vehicle body panels, large home-appliance shells, and structural steel sections through multi-stage finishing lines.

 

As a single guide conveyor chain running on standard I-beam track, the QXG250 simplifies installation and reduces infrastructure cost versus dual-rail alternatives. The fixed hanging plate chain architecture ensures every suspension point holds a consistent orientation throughout the loop, removing fixture positioning variability that slows loading and unloading operations. For painting line chain installations where oven temperatures fluctuate between ambient and 200°C+-and where paint overspray deposits on exposed surfaces-the sealed bearing system and multi-tier surface protection keep the chain operational without scheduled greasing interventions for 12 to 18 months.

 

Hangzhou Ocean Industry manufactures the QXG250 series in three load tiers-Standard, Heavy-Duty, and Extra Heavy-allowing system designers to match chain specification precisely to the weight profile of conveyed items rather than over-specifying across the entire loop. This tiered approach reduces material cost on lighter conveyor sections while preserving the heavy duty conveyor chain performance where it matters most.

 

 

Before selecting an overhead chain, understanding the operating envelope is critical. The QXG250 single guide conveyor chain is engineered for three distinct environmental bands:

Temperature Range: Standard (S) variant operates reliably from –20°C to 200°C, covering ambient workshop conditions through standard paint curing ovens. The Heavy-Duty (HD) variant extends the upper limit to 240°C for prolonged bake cycles. The Extra Heavy (HA) variant reaches 280°C with tapered roller bearings and specialized high-temperature grease formulations, suited for extreme thermal processing zones.

Load Parameters: Per-point suspension capacity spans 100 kg (S) through 125 kg (HD) to 150 kg (HA). Allowable tensile force ranges from 50 kN to 75 kN, with breaking strength reaching 130 kN on the HA tier. These ratings assume steady-state conveying at speeds below 15 m/min with gradual acceleration profiles.

Speed Considerations: The sealed bearing architecture maintains a friction coefficient under 0.004 across the rated speed band of 2–18 m/min. At speeds above 18 m/min, additional heat dissipation analysis is recommended. Contact our engineering desk for high-speed conveyor layout review.

Corrosion Exposure: Three surface treatment tiers correspond to exposure severity-epoxy e-coating for dry indoor environments, zinc plating for humid electroplating workshops with acidic vapor exposure, and hot-dip galvanizing for outdoor installations or lines with direct water contact. Selecting the correct corrosion defense level directly impacts chain service longevity.

 

 

Choosing the correct QXG250 variant depends on three factors: maximum per-point load, peak operating temperature, and the chemical aggressiveness of your working environment.

QXG250-S (Standard): Best for dry indoor painting lines with per-point loads under 100 kg and oven temperatures not exceeding 200℃. E-coating surface treatment provides adequate corrosion resistance for standard paint-shop humidity levels.

QXG250-HD (Heavy-Duty): Recommended when per-point loads reach 100–125 kg or when the chain passes through electroplating zones with chemical mist exposure. The zinc-plated surface adds sacrificial corrosion protection. Suitable for oven temperatures up to 240℃.

QXG250-HA (Extra Heavy): Select this variant for loads of 125–150 kg per point, oven zones above 240℃, or outdoor/wet-process environments where hot-dip galvanizing provides maximum long-term corrosion defense. Tapered roller bearings handle combined radial and axial loads better than ball bearings at higher capacities.

Not sure which variant fits your project? Send your conveyor layout drawing and load schedule to our engineering team. We will recommend the optimal configuration and provide a complete Technical Data Sheet within 24 hours.

 

 

Parameter	QXG250-S	QXG250-HD	QXG250-HA
Chain Pitch	250 mm	250 mm	250 mm
Weight per Meter	10.5 kg	11.8 kg	13.2 kg
Allowable Tensile Force	50 kN	65 kN	75 kN
Breaking Tensile Force	90 kN	110 kN	130 kN
Single-Point Load Rating	100 kg	125 kg	150 kg
Hanger Interval Formula	250+(250×N)	250+(250×N)	250+(250×N)
Horizontal Wheel Diameter	100 mm	110 mm	125 mm
Vertical Wheel Diameter	80 mm	90 mm	100 mm
Bearing Type	Sealed 6205 Ball	Sealed 6206 Ball	Tapered 30205 Roller
Min. Horizontal Curve	R750	R800	R900
Min. Vertical Bend	R3200	R3600	R4000
Peak Operating Temperature	200°C	240°C	280°C
Corrosion Protection	Epoxy E-Coating	E-Coating + Zinc	Hot-Dip Galvanized
Hanger Plate Design	Fixed One-Piece Forged	Fixed One-Piece Forged	Fixed Reinforced Forged

Notes on specification interpretation:

• Hanger Interval Formula: N represents the number of empty links between loaded hangers. For example, N=2 yields an effective hanger spacing of 750 mm-useful when conveying large items that need wider clearance.

• Bearing Type Selection: Ball bearings (6205/6206) suit steady-state conveying with moderate radial loads. Tapered roller bearings (30205) handle combined radial-plus-axial forces at elevated temperatures-essential on loops with steep vertical climbs or heavy swing loads.

• Curve Radius vs. Wheel Diameter: Larger wheel diameters require wider horizontal turn radii. When retrofitting an existing track with R750 curves, only the S variant is compatible; HD and HA variants need track curve modifications.

• All values measured per ISO 18334 at 20°C / 60% RH. Custom pitch, hanger geometry, and bearing configurations available on specification order.

 

Forged Monolithic Hanger Integration

The fixed hanging plate chain structure is produced during the drop-forging stage-not attached afterward. Metal grain flow continues seamlessly from the link body into the hanger extension, creating a load path with no stress-concentrating joints. Accelerated fatigue testing confirms over 2 million cycles with zero hanger-plate separation, a figure that bolt-on or weld-on alternatives cannot match.

Wider Pitch for Reduced Joint Stress

Compared to 200mm-pitch alternatives, the 250mm interval means fewer links per meter carrying the same total load. Each pin joint therefore experiences lower peak stress, which directly translates to longer fatigue life at the articulation points. The broader spacing also prevents physical interference between adjacent workpieces on curved track sections and allows longer fixture suspension rods.

Double-Sealed High-Temperature Bearing Packages

Every wheel unit ships with double-lip contact seals pre-filled with synthetic high-temperature grease. The sealing architecture blocks paint overspray particles, metallic dust, and moisture from reaching the rolling elements. Ball-bearing variants (6205/6206) deliver friction coefficients below 0.004 with noise output under 65 dB at rated speed. The tapered-roller 30205 variant in the HA model handles combined loads and temperatures up to 280℃ without re-greasing.

Graduated Corrosion-Defense System

Three protection levels allow you to match surface treatment to environment severity. Black E-coating (standard) provides 200+ hours of salt-spray resistance for dry paint shops. Zinc plating adds a sacrificial anode layer for humid electroplating areas. Hot-dip galvanizing delivers 500+ hours of salt-spray endurance for outdoor exposure or direct water-contact processes.

Cross-Variant Dimensional Compatibility

All QXG250 grades share identical pitch, pin diameter, and I-beam engagement profiles. A conveyor track built for the Standard model accepts Heavy-Duty or Extra-Heavy links without structural changes. Field upgrades require only individual link swaps, minimizing line downtime during capacity expansion.

Low-Friction Energy Savings

Sealed-for-life rolling elements produce a rolling friction coefficient below 0.004, which reduces the drive motor's tractive effort by approximately 18–22% compared to open bearing or manual-lubrication chain designs. Over a multi-year installation, the energy-cost reduction typically offsets the chain's initial purchase premium.

 

 

The QXG250 serves as the traction element in a continuous-loop single-I-beam overhead conveyor circuit. A caterpillar or sprocket drive station engages the chain link plates and pulls the loop forward along the I-beam track.

Horizontal wheels roll along the bottom flange of the I-beam, converting drive rotation into steady linear travel. Fixed hanger plates suspend workpieces at 250mm intervals (or wider per the spacing formula).

At the far end of the line, the chain wraps around a return idler and travels back along the return track to close the loop. A tensioning device compensates for thermal expansion and gradual wear elongation.

Through horizontal curves, articulated pin-and-bushing joints allow the chain to follow I-beam bends down to R750 (Standard). Vertical guide wheels maintain flange alignment.

During vertical elevation changes, both horizontal and vertical wheel sets share the radial load, keeping the chain securely seated on the I-beam profile.

 

 

Elevated Load Capacity: 150 kg per suspension point (HA model) with 130 kN breaking tensile strength-a 25% improvement over the QXG200 series.

Extended Service Interval: Sealed-for-life bearings eliminate scheduled lubrication. Average maintenance-free interval: 12–18 months under standard conditions.

Proven Service Durability: Drop-forged alloy steel with quench-and-temper heat treatment delivers 10–15 years of continuous operation in automotive paint-shop environments.

Low-Noise Travel: Precision wheels with sealed rolling elements produce sound levels below 65 dB(A) at rated speed, meeting workplace noise regulations.

Energy Efficiency: Rolling friction coefficient below 0.004 reduces drive-motor power draw by 18–22% versus unsealed or manual-lubrication alternatives.

On-Site Assembly: Link-by-link joining with standard hand tools-no specialized equipment required for installation or future length adjustment.

Choosing between the three QXG250 variants depends on four factors: per-point load, peak oven temperature, track curvature tightness, and corrosion environment. The following decision framework simplifies specification:

Select QXG250-S (Standard) when: per-point loads stay below 100 kg, oven temperatures do not exceed 200°C, horizontal turn radii are R750 or wider, and the operating environment is a dry indoor paint shop or assembly floor. This variant offers the lowest weight per meter (10.5 kg/m), reducing total chain mass and drive motor sizing on longer loops.

Select QXG250-HD (Heavy-Duty) when: suspension loads reach 125 kg, baking temperatures hit 240°C, tighter horizontal curves down to R800 are present, and moisture or acidic vapor exposure requires zinc-plated surface defense. The 6206 sealed ball bearing and zinc e-coating combination provides the balanced mid-range solution for electroplating and multi-stage finishing operations.

Select QXG250-HA (Extra Heavy) when: per-point capacity must reach 150 kg, oven zones push to 280°C, track geometry demands R900 minimum horizontal radius with reinforced forged hanger plates, and hot-dip galvanizing is required for outdoor or high-moisture installations. The tapered roller 30205 bearing handles both radial and axial loads at elevated temperatures where ball bearings risk premature seizure.

Mixed-tier recommendation: On loops carrying varying load densities-for instance, a painting line chain section through a curing oven with heavy cabinet bodies followed by a lighter cooling zone with small brackets-deploying S variants on light-load segments and HA variants on heavy-load segments optimizes total system cost without compromising safety margins at any point. All three tiers share the same pitch, pin interface, and hanger plate geometry, enabling seamless interlinking.