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The Non-Powered Straight Roller Conveyor (also known as a gravity roller conveyor) is a classic material handling system that requires no external drive. It relies entirely on manual pushing or the gravity component of the load itself to move goods along a straight path. As one of the most widely used types of roller conveyors, it has earned its place as an indispensable "golden partner" in logistics warehouses, manufacturing plants, and e‑commerce sorting centers worldwide – thanks to its ultra-simple structure, reliable operation, and minimal maintenance.
This unit consists of high‑precision free‑turning rollers, a rugged frame, and adjustable legs. It is particularly suited for short‑distance material transfer, workstation linking on assembly lines, packaging operations, and post‑sorting diversion. It consumes no electricity, yet dramatically reduces manual labor intensity – a perfect example of how simplicity can be the ultimate sophistication in industrial handling.
The conveyor is built with a modular philosophy, allowing easy assembly, reconfiguration, and future expansion. The main components are:
| Component | Function | Material / Finish Options (Customizable) |
|---|---|---|
| Rollers | Core load‑bearing and conveying elements, free‑rotating | Galvanized steel, chrome‑plated steel, stainless steel (SUS304), aluminum alloy, PVC, rubber/PU‑coated (anti‑slip) |
| Frame (side plates) | Holds and aligns the rollers | Q235 cold‑rolled steel (electrostatic powder‑coated), 6063‑T5 aluminum extrusion, stainless steel |
| Support legs | Supports the entire unit, height‑adjustable | Rectangular steel tube, aluminum profile, folding type with casters (for mobility) |
| Cross braces | Enhances rigidity and stability | Steel square tube, aluminum connecting profiles |
| Leveling feet | Fine‑tunes height and levels the conveyor | Various model for different load |
| Side guides / guard rails | Prevents load deviation or falling (optional) | Round steel, L‑shaped aluminum, nylon wear strips |
Selection Tip: For humid or cold‑storage environments, choose stainless steel rollers + aluminum frame. If frequent layout changes are expected, the folding leg with casters is highly recommended for quick relocation.
The conveyor operates without motors, gearboxes, or control systems – purely on physical principles:
The operator pushes the load manually. With precision ball bearings, the rollers turn with extremely low resistance, so a single worker can easily move a fully loaded pallet weighing up to 200 kg – significantly reducing physical effort.
The horizontal component of gravity causes the load to slide down automatically, enabling hands‑free, gravity‑powered transport. On longer slopes where speed may become excessive, optional damping rollers or spiral speed controllers can be fitted to ensure a gentle "soft landing" and prevent collisions at the end.
Light loads (cartons < 10 kg) : recommended slope 2.5° ~ 3.5°
Heavy loads (pallets > 50 kg) : 1.0° ~ 1.5° (high inertia, avoid rear‑end impact)
If the floor is perfectly flat but automatic glide is desired, optional wedge shims can be placed under the legs to create a slight inclination.
Zero electricity consumption – operating energy = 0 kWh; supports green and low‑carbon initiatives.
Extremely low initial investment – no motors, VFDs, or control cabinets required; purchase cost is only 20%–30% of a powered conveyor system.
Virtually maintenance‑free – no complex electrical parts; daily care is just cleaning roller surfaces (tape residue, strapping bits).
Fast repair – modular plug‑in roller design; a single roller can be replaced in under 3 minutes without special tools.
Long‑life bearings – sealed precision ball bearings (NSK/SKF/HRB) are dust‑ and moisture‑resistant; only annual greasing (lithium grease) is needed.
Wide load variety – handles cartons, plastic totes, metal bins, drums, pallets, and other flat‑bottomed rigid items.
Versatile layout – horizontal or inclined installation; can be used alone or combined with belt conveyors, chain conveyors, etc., to form complex sorting or distribution systems.
100% reusability – bolted modular construction allows easy disassembly and re‑use when production lines are rearranged.
Ultra‑quiet operation – noise < 35 dB, well below industrial limits; ideal for cleanrooms, electronics assembly, and pharmaceutical workshops.
No nip‑point hazards – no high‑speed moving parts; optional polyurethane bumpers at the end for impact absorption.
Wide temperature range – standard version: ‑5°C ~ +40°C; cold‑storage version: ‑30°C ~ 0°C (with low‑temperature grease and stainless steel bearings).
ESD protection – optional copper grounding chains to dissipate static charge, protecting sensitive electronic components.
Our SR100 series is engineered to strict industrial standards, with the following range of options:
| Parameter | Specifications / Details |
|---|---|
| Model | SR100 (non‑powered straight conveyor) |
| Roller diameter (D) | Φ25, Φ38, Φ50, Φ60, Φ76, Φ80, Φ89 mm (larger diameter = higher load capacity) |
| Roller material | Galvanized steel, chrome‑plated, stainless steel (SUS304), aluminum alloy, PVC, ABS, rubber/PU‑coated |
| Roller pitch (P) | 60, 75, 90, 100, 120, 150 mm (Golden rule: at least 3 rollers must contact the load bottom at all times) |
| Frame material | Carbon steel folded plate (≥2.5 mm), anodized aluminum extrusion, stainless steel |
| Frame inner width (W) | Standard: 420, 500, 600, 700, 800, 900, 1000 mm; custom up to 1500 mm |
| Frame length (L) | Standard: 600, 1000, 2000, 3000, 4000, 5000 mm; custom up to 12,000 mm |
| Frame height (H) | Adjustable range: 300 ~ 1500 mm (recommended working height: 400 mm for ergonomic operation) |
| Max load per meter | Standard: 50 ~ 100 kg/m; heavy‑duty reinforced: up to 1000 kg/m |
| Installation slope | Horizontal (floor flatness < ±0.5°); inclined: ≤ 8° (recommended 1°~3.5° for gravity flow) |
| Ambient temperature | Standard: -5°C ~ +40°C; Cold‑storage version: -30°C ~ 0°C |
| Ambient humidity | ≤ 90% (non‑condensing, frost‑free) |
| Roller mounting type | Spring‑loaded, internal thread, full flat tenon, through‑shaft with pin hole |
| Surface finish | Electrostatic powder coating (RAL color chart fully customizable) |
To streamline communication and ensure accurate delivery, please generate your order number using the following format:
Model no. -rack inner width(W)-rack height(H)-rack length(L)-roller diameter(D)-roller pitch(P)
| Code | Meaning | Example Value |
|---|---|---|
| SR100 | Product series | Fixed prefix |
| W | Frame inner width (mm) | 500 |
| H | Frame height (mm) | 600 |
| L | Frame length (mm) | 1000 |
| D | Roller diameter (mm) | 50 |
| P | Roller pitch (mm) | 75 |
Standard Order Example:
Requirement: inner width 500 mm, height 600 mm, length 1000 mm, roller diameter 50 mm, pitch 75 mm.
Order No.:SR100-500-600-1000-50-75
Customization Note: If you need stainless steel, rubber‑coated rollers, special colors, or additional accessories (guards, dampers, etc.), simply add "‑CUSTOM" after the order number and specify your requirements. Our engineering team will respond with a confirmed 3D proposal within 2 hours.
To suit diverse operating conditions, we offer a full range of add‑on components:
| Accessory | Function |
|---|---|
| Side guide rails | Prevents loads from drifting or falling off (round steel, aluminum, or nylon wear strip options) |
| End stoppers | Fixed polyurethane bumper / gravity‑actuated flip‑up stop (prevents pallets from rolling off) |
| Speed dampers | Brush‑type damping rollers or eccentric damping wheels – control glide speed on long inclines to avoid rear‑end collisions |
| Workstation positioning stops | Pneumatic or manual stop hooks for precise holding at assembly stations; release when operation is complete |
| ESD grounding chains | Copper chains to dissipate static charge – protects sensitive electronic parts |
| Transition plates | Bridge plates between different equipment to eliminate height gaps and prevent jams |
| Wedge shims | Placed under legs to quickly create a slight slope without modifying the floor |
This conveyor excels in a wide range of scenarios:
Logistics & Warehousing – carton conveying in e‑commerce fulfillment centers, express sorting hubs, and retail distribution centers; pick‑to‑light / pick‑to‑voice order picking lines.
Manufacturing – assembly line workstation linking and in‑place rotation of components (automotive, home appliances, electronics, 3C products).
Loading / unloading docks – placed at truck tailgates with a slight decline, allowing goods to slide in/out, greatly reducing dock worker fatigue.
Accumulation & buffering – temporary storage before packaging, inspection, or palletizing; zero back‑pressure accumulation prevents product damage.
Food & Beverage – conveying on beverage filling lines and food packaging lines.
Pharmaceutical & Medical – cleanroom conveying (all‑aluminum/stainless steel versions comply with GMP standards).
Express sorting – integration with DWS (dimensioning, weighing, scanning) systems as a vibration‑free platform that improves dynamic scale accuracy.
Special environments – ‑25°C cold storage, high‑humidity, or dusty conditions (with appropriate material choices).
We offer comprehensive customization based on your specific needs:
Load dimensions – length, width, height, and weight per unit.
Load bottom condition – flatness, material (solid flat, grid pattern, etc.).
Special environmental factors – humidity, temperature, chemical exposure, etc.
Installation type – floor‑mounted fixed, folding mobile, or overhead suspension.
Aesthetic requirements – frame and roller color (RAL code) and surface finish.
Design Principle: We strictly follow the “at least 3 rollers under the load at all times” rule to ensure stable conveying. The more detailed your requirements, the more precise our solution will be.
Professional manufacturing – years of experience in conveyor design and production; proven reliability under heavy‑duty cycles.
Superior quality – high‑grade welded steel tubes, precision bearings, and reinforced profiles; meticulous workmanship.
Flexible customization – from standard units to fully custom designs – rapid response and no design fees.
Full‑service support – we provide a complete cycle: site survey → solution design → equipment fabrication → installation & commissioning → after‑sales maintenance.
Let us simplify your material handling, and make simplicity even more cost‑effective. For a free CAD layout drawing or a tailored quotation, please contact us today!
The Straight Modular Gravity Roller Conveyor is a simple and reliable non-powered conveying solution for cartons, totes, pallets, boxes, and other flat-bottom unit loads. Products move along freely rotating rollers either by manual pushing on a horizontal conveyor or by gravity when the conveyor is installed at a suitable incline.
With a modular frame, multiple roller diameters and materials, adjustable support heights, and optional accessories, the conveyor can be configured for warehouses, production lines, packing stations, assembly areas, and distribution centers.
A gravity roller conveyor is a non-powered material handling system that uses freely rotating rollers to move goods along a straight conveying path.
Unlike a powered roller conveyor, it does not require motors, gearboxes, or electrical controls. Products can be manually pushed along a horizontal conveyor or move automatically under gravity when the conveyor is installed at a suitable incline.
The modular structure allows individual conveyor sections to be installed independently or connected to create longer conveying lines. Sections can also be integrated with curved roller conveyors, powered conveyors, workstations, and other material handling equipment.
Because of its simple construction and flexible configuration, a straight gravity roller conveyor is widely used for short-distance transfer, workstation connection, carton handling, temporary accumulation, packing, and warehouse material movement.
The operating principle depends mainly on whether the conveyor is installed horizontally or at an incline.
When installed horizontally, operators manually push cartons, totes, pallets, or other suitable loads along the conveyor.
Free-turning rollers with bearings reduce rolling resistance, allowing goods to move more easily than carrying or sliding them across a fixed surface.
This configuration is suitable for packing stations, assembly workstations, inspection areas, picking lines, and other intermittent material handling applications.
When the conveyor is installed at a suitable slope, gravity moves products from the higher end toward the lower end without a powered drive.
The required slope depends on product weight, bottom condition, roller diameter, roller pitch, bearing resistance, conveyor length, and required conveying speed.
For longer inclined sections, speed-control components or end stops can be added where necessary to help control product movement.
The required conveyor slope depends on product weight, bottom condition, roller resistance, and required conveying speed.
As an initial reference:
Load Type | Suggested Initial Slope |
|---|---|
Light Cartons Below 10 kg | Approx. 2.5°–3.5° |
Medium Loads 10–50 kg | Approx. 1.5°–2.5° |
Heavy Loads Above 50 kg | Approx. 1.0°–1.5° |
Heavier loads generally require a smaller slope because their higher inertia can increase conveying speed and impact at the end of the line.
These values should be used as initial selection references only. The final slope should be confirmed according to product dimensions, bottom surface, roller configuration, conveyor length, and actual operating conditions.
The conveyor operates without a motor or electrical drive system, providing a simple solution for applications where automatic powered conveying is unnecessary.
Individual straight conveyor sections can be used independently or connected to form longer material handling lines.
The modular construction also makes future layout modification or conveyor expansion easier.
Rollers are available in different diameters, materials, and surface configurations according to product weight and operating requirements.
Options include galvanized steel, stainless steel, aluminum alloy, PVC, ABS, and rubber or PU-coated rollers.
Different frame widths are available for cartons, totes, pallets, and other product dimensions.
Adjustable support legs allow the conveyor height to match workstations, packing tables, machines, or adjacent conveyor sections.
The conveyor can be installed horizontally for manual product movement or at a suitable incline for gravity flow.
Straight gravity roller sections can connect with curved gravity conveyors, powered roller conveyors, belt conveyors, packing stations, and other material handling equipment.
A typical straight gravity conveyor consists of rollers, side frames, support legs, cross braces, leveling feet, and optional side guides.
Component | Function | Available Options |
|---|---|---|
Rollers | Support and convey products | Galvanized steel, stainless steel, aluminum, PVC, ABS, rubber/PU-coated |
Side Frames | Hold and align rollers | Carbon steel, aluminum, stainless steel |
Support Legs | Support conveyor structure | Fixed, adjustable, mobile options |
Cross Braces | Improve frame rigidity | Steel or aluminum |
Leveling Feet | Level and stabilize conveyor | Selected according to load |
Side Guides | Help keep products on the conveyor | Steel, aluminum or wear-strip options |
Parameter | Specification |
|---|---|
Model | SR100 |
Conveyor Type | Straight Modular Gravity Roller Conveyor |
Drive Mode | Non-Powered / Gravity / Manual Push |
Roller Diameter | Φ25 / Φ38 / Φ50 / Φ60 / Φ76 / Φ80 / Φ89 mm |
Roller Material | Galvanized Steel / Chrome-Plated Steel / Stainless Steel / Aluminum / PVC / ABS / Rubber or PU-Coated |
Roller Pitch | 60 / 75 / 90 / 100 / 120 / 150 mm |
Frame Material | Carbon Steel / Aluminum / Stainless Steel |
Standard Inner Width | 420 / 500 / 600 / 700 / 800 / 900 / 1000 mm |
Custom Width | Up to approx. 1500 mm |
Standard Length | 600 / 1000 / 2000 / 3000 / 4000 / 5000 mm |
Custom Length | Up to approx. 12000 mm |
Adjustable Height | Approx. 300–1500 mm |
Standard Load Capacity | Approx. 50–100 kg/m |
Heavy-Duty Configuration | Up to approx. 1000 kg/m |
Installation | Horizontal / Inclined |
Recommended Gravity Slope | Approx. 1°–3.5°, depending on load |
Standard Operating Temperature | Approx. -5°C to +40°C |
Roller Mounting | Spring-Loaded / Internal Thread / Tenon / Through-Shaft |
Specifications vary according to roller diameter, roller pitch, conveyor width, frame structure, load distribution, installation method, and operating conditions.
Roller diameter and roller pitch are two important factors when configuring a gravity roller conveyor.
Roller diameter should be selected according to product dimensions, product weight, required conveyor load, and operating conditions.
Smaller roller diameters can be suitable for lightweight cartons and packages, while larger and stronger rollers are commonly selected for heavier totes, pallets, containers, and industrial components.
Roller pitch refers to the center-to-center distance between adjacent rollers.
As a practical design principle:
The product should normally maintain contact with at least three rollers during conveying.
Products with shorter bottoms generally require closer roller spacing, while longer rigid products may use wider spacing.
Correct roller pitch helps improve conveying stability and reduces the risk of products tipping or becoming trapped between rollers.
The best roller material depends on the load, operating environment, and product surface.
Roller Material | Recommended Application |
|---|---|
Galvanized Steel | General warehouse, carton, tote, and industrial material handling |
Stainless Steel | Humid, corrosion-sensitive, or frequently cleaned environments |
Aluminum | Lightweight conveyor configurations |
PVC / ABS | Lightweight cartons and packages |
Rubber / PU-Coated | Applications requiring additional grip or reduced direct metal contact |
For most general warehouse and manufacturing applications, galvanized steel rollers provide a practical balance of durability and cost.
Stainless steel should be considered when corrosion resistance or frequent cleaning is a higher priority.
Rubber or PU-coated rollers can be selected where additional grip or gentler product contact is required.
Gravity roller conveyors work best with products that have a flat, rigid, and sufficiently strong bottom surface.
Cartons
Boxes
Plastic totes
Trays
Metal containers
Pallets
Rigid packaged products
Soft bags
Flexible packages
Products with uneven bottoms
Very small packages
Products with protruding feet
Irregularly shaped loads
A useful selection principle is that the product should normally maintain contact with at least three rollers during conveying.
If the product has an irregular or flexible bottom, provide its dimensions, weight, and bottom structure so the roller diameter and pitch can be evaluated before conveyor selection.
The straight gravity roller conveyor is suitable for a wide range of warehouse, production, packing, and material handling operations.
Move cartons and totes between picking, packing, temporary storage, staging, and dispatch areas.
Install horizontal gravity roller sections between workstations to make manual product transfer easier.
Connect production or assembly workstations and allow components, containers, or finished goods to move between processes.
Inclined gravity sections can be used where suitable to move cartons between different working heights or temporary loading areas.
Gravity roller sections can provide temporary product holding or buffering between production, inspection, packing, and downstream processes.
Heavy-duty configurations with suitable roller diameters, roller pitch, frames, and support spacing can be designed for pallets and heavier industrial unit loads.
Optional components can be added according to the material handling application.
Accessory | Function |
|---|---|
Side Guide Rails | Help keep products within the conveying path |
End Stops | Stop cartons, totes, or pallets at the end of the conveyor |
Speed Dampers | Help control product speed on inclined sections |
Positioning Stops | Hold products at packing, inspection, or assembly stations |
Transition Plates | Bridge gaps between adjacent conveyor equipment |
Mobile Supports | Allow selected conveyor sections to be repositioned |
Leveling Feet | Adjust conveyor height and alignment |
Wedge Shims | Create a slight gravity slope where required |
Before ordering, consider the following factors.
Product Dimensions
Confirm the length, width, and height of the cartons, totes, pallets, or components being conveyed.
Product Weight
Determine the maximum weight per item and expected load per conveyor section.
Product Bottom Condition
Gravity roller conveyors work best with sufficiently flat and rigid-bottom products.
Conveyor Width
Select an effective width that provides sufficient support without making the conveyor unnecessarily wide.
Roller Diameter
Choose the roller size according to product weight, dimensions, and required load capacity.
Roller Pitch
Configure the spacing so that the product is normally supported by at least three rollers.
Conveyor Length and Height
Determine the required transfer distance and working height according to the facility layout.
Horizontal or Inclined Installation
Choose horizontal installation for manual pushing or an appropriate incline when gravity flow is required.
Operating Environment
Select the frame material, roller material, bearings, and surface treatment according to temperature, humidity, cleaning, and corrosion requirements.
The SR100 model code identifies the main conveyor dimensions and roller configuration.
Model Format:
SR100-W-H-L-D-P
Code | Meaning | Example |
|---|---|---|
SR100 | Product Series | SR100 |
W | Frame Inner Width | 500 mm |
H | Frame Height | 600 mm |
L | Frame Length | 1000 mm |
D | Roller Diameter | 50 mm |
P | Roller Pitch | 75 mm |
Required conveyor:
Inner width: 500 mm
Height: 600 mm
Length: 1000 mm
Roller diameter: 50 mm
Roller pitch: 75 mm
Model: SR100-500-600-1000-50-75
Additional roller materials, surface treatments, side guides, stops, mobile supports, and other accessories can be specified separately according to the application.
A gravity roller conveyor is a non-powered conveyor that uses freely rotating rollers to move cartons, totes, pallets, and other suitable unit loads by manual pushing or gravity.
No. The conveyor does not require a motor or electrical drive. Products are moved manually on horizontal sections or by gravity when the conveyor is installed at an appropriate incline.
Gravity roller conveyors are suitable for cartons, boxes, totes, trays, pallets, containers, and other unit loads with sufficiently flat and rigid bottoms.
The required slope depends on product weight, bottom surface, roller resistance, conveyor length, and desired speed. As an initial reference, many gravity applications use slopes of approximately 1°–3.5°, with the final configuration determined through actual product and conveyor conditions.
Roller pitch depends mainly on the length and rigidity of the product bottom. As a general design principle, the product should normally maintain contact with at least three rollers.
Yes. Heavy-duty configurations can be designed for pallets, but roller diameter, roller pitch, frame structure, support spacing, and total load must be selected according to the actual pallet dimensions and weight.
A gravity roller conveyor moves products by manual pushing or gravity and does not require a powered drive. A powered roller conveyor uses motors and drive components to move products automatically at a controlled speed.
Yes. Straight gravity roller sections can be integrated with curved roller conveyors, powered conveyors, and other conveyor equipment to create a complete material handling route.
Yes. Conveyor width, length, height, roller diameter, roller pitch, roller material, frame material, and accessories can be configured according to the application.
To recommend the correct gravity roller conveyor configuration, please provide:
Product dimensions: Length × width × height
Product weight: Maximum weight per unit
Bottom condition: Flat, rigid, grid, uneven, or other structure
Required conveyor size: Width, length, and working height
Installation: Horizontal or gravity incline
Operating environment: Temperature, humidity, cleaning, or corrosion requirements
Special requirements: Roller material, side guides, stops, mobile supports, or other accessories
These details help determine the appropriate roller diameter, roller pitch, conveyor width, frame structure, and load capacity.
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