Carton Flow Rack Systems
Gravity-fed roller or wheel lanes built into pallet rack bays for organized, FIFO case and carton picking. Load from the back, pick from the front — every SKU always in the same place.
Talk with a pallet rack specialist. Call (800) 326-4403 or Email Sales@MH-USA.com
What Is Carton Flow Rack?
Tilted roller or wheel-bed lanes installed inside pallet rack bays that use gravity to move cartons, cases, and totes from the loading side to the picking face — automatically.
Carton flow rack (also called case flow, gravity flow, or pick rack) converts standard pallet rack bays into organized, high-density carton picking stations. Inclined lane sections with rollers or wheel beds are placed on pallet rack beams. When a carton is loaded at the back, gravity slides it forward to the pick face at the front. When the front carton is picked, the next one rolls into position.
The result: every SKU always has a carton at the pick face. No reaching, no searching, no wasted steps. Order pickers work a single aisle face and pull exactly what they need in sequence. Pick rates increase 2–3× compared to static shelving, and FIFO rotation is automatic — critical for food, beverage, pharmaceutical, and any operation with lot-tracked or expiration-dated inventory.
Material Handling USA designs, supplies, and installs carton flow rack systems for distribution centers, e-commerce fulfillment, manufacturing kitting lines, and cold storage operations nationwide.
Carton Flow Track Types
Wheel Bed (Skatewheel)
Multiple small skate wheels mounted on axles in a formed steel channel. The most common and cost-effective type. Handles light to medium cartons (5–50 lbs). Wheels adjust to different carton widthsand bottom surfaces. Easy to installand replace.
Best for: E-commerce, retail distribution, general case picking
Full-Width Roller
Steel or plastic rollers spanning the entire lane width. Handles heavier loads (up to 75+ lbs per carton) and wider products. More robust than wheel beds but higher cost per lane. Consistent flow for uniform-sized cartons.
Best for: Beverage, heavy consumer goods, uniform case sizes
Knuckled Track / Tilt Tray
Hinged or tilting lane sections that can be adjusted for different product depthsand weights. Some systems use spring-loaded speed controllers or brakes to regulate carton flow speed and prevent pile-ups.
Best for: Multi-SKU operations with varied carton sizesand weights
How Carton Flow Rack Works
Load from Rear
Replenishment crew loads full cases from the back (stock) aisle. Separate aisle from pickers eliminates congestion.
Gravity Flow
Tilted lanes use gravity to slide cartons forward on rollers or wheels. No power, no motors — 100% passive.
Pick from Front
Order pickers work the front (pick) aisle. Every SKU has a carton at the face. Pull what’s needed — next carton rolls into place.
Auto FIFO
First carton loaded is always the first picked. Automatic rotation — no manual date-checking or stock shifting.
Technical Specifications
| Parameter | Carton Flow Rack | Notes |
|---|---|---|
| Track Types | Wheel bed, full-width roller, knuckled | Choose by carton weight and bottom surface |
| Lane Width | 6″ to 36″+ per lane | Adjustable dividers available |
| Lane Depth | 4 to 8+ cartons per lane typical | Standard pallet rack bay depth |
| Carton Weight | 5 to 75+ lbs per carton | Roller tracks for heavier loads |
| Incline | 3° to 5° typical | Adjustable for product characteristics |
| Flow Direction | FIFO — load rear, pick front | Automatic first-in, first-out rotation |
| Frame | Standard pallet rack beams & uprights | Drop into existing selective rack bays |
| Levels | 2 to 6+ flow levels per bay | Ergonomic pick heights available |
| Power | None — 100% gravity powered | No electricity, no maintenance |
| Speed Control | Available — brakes, speed controllers | Prevents carton damage at pick face |
Applications & Industries
📦 E-Commerce Fulfillment
High-volume each-pick and case-pick operations. Carton flow organizes hundreds of SKUs at ergonomic pick heights, dramatically reducing walk time and increasing units picked per hour.
🍔 Food & Beverage Distribution
Automatic FIFO for expiration-dated products. Separate load and pick aisles keep production moving. Cold storage rated options available for cooler and freezer environments.
💊 Pharmaceutical & Medical
Lot-tracked inventory requires strict FIFO. Carton flow provides automatic rotation, clear SKU labeling positions, and audit-ready organization for regulated facilities.
🏭 Manufacturing Kitting
Line-side carton flow delivers components to assembly stations in order. Pickers pull kits from organized, replenished lanes — reducing production line stoppages.
🛒 Retail Distribution
Store replenishment picking from carton flow racks. Each store’s order is picked from a single aisle face with every SKU visible and accessible. Case-level picking at maximum speed.
🔧 Auto Parts & Hardware
Hundreds of small-to-medium SKUs organized in divided flow lanes. Wheel bed tracks handle varied box sizes. Easy to reconfigure when product mix changes.
Carton Flow vs. Other Picking Systems
| System | Pick Speed | FIFO | SKU Density | Cost | Best For |
|---|---|---|---|---|---|
| Carton Flow Rack | ★★★★★ | Automatic | High | $$ | Case/carton picking, FIFO required |
| Static Shelving | ★★ | Manual | Low | $ | Low-volume, few SKUs |
| Standard Selective Rack | ★★★ | Manual | Medium | $ | Pallet-level picks |
| Pallet Flow Rack | ★★★★ | Automatic | High | $$$ | Full-pallet FIFO |
| Automated Pick Systems | ★★★★★ | System-controlled | Very High | $$$$ | Extremely high volume |
Choose carton flow if: You pick at the case or carton level, need FIFO, have a moderate-to-high number of SKUs, and want to dramatically increase pick rates without automation investment.
When to Choose Carton Flow Rack
Carton flow rack uses gravity-fed roller or wheel lanes to present individual cartons, cases, and totes at a pick face — dramatically increasing pick speed and accuracy for order fulfillment operations.
Ideal Conditions for Carton Flow
- High-volume piece or case picking — E-commerce, pharmaceutical, parts distribution, and any operation where workers pick individual items or cases from cartons. Carton flow puts every SKU within arm’s reach
- Many SKUs, moderate depth per SKU — Each lane holds 3–8 cartons of the same SKU. Ideal for operations with hundreds of SKUs that each need a few cases on hand
- FIFO is required — Cartons load from the back and pick from the front. First in, first out is automatic — critical for pharmaceuticals, food, and date-sensitive products
- Reducing walking time — Putting more SKUs within reach of a single pick position reduces the distance workers travel per order. Some operations cut walking time by 50–70% vs. static shelving
- Ergonomic pick operations — Carton flow lanes at waist to shoulder height create ergonomic pick zones. No bending, no reaching overhead. Reduces fatigue and injury rates
Carton Flow vs. Static Shelving
| Factor | Static Shelving | Carton Flow |
|---|---|---|
| SKU density | 1 facing per shelf slot | 3–8 deep per lane |
| Replenishment | Same aisle as picking | Rear aisle (separate from pick) |
| Pick rate | 60–100 lines/hr | 150–300+ lines/hr |
| FIFO | Manual rotation needed | Automatic by gravity |
| Pick accuracy | Moderate | High (dedicated lanes per SKU) |
💡 Separate Pick & Replenish Aisles
Carton flow’s biggest operational advantage: pickers work the front while replenishment happens from the back. No aisle congestion, no waiting for restocking. This separation alone can double effective pick throughput compared to static shelving.
Flow Lane Types & Configuration
The flow lane is the heart of the system. Different lane types suit different carton sizes, weights, and pick requirements.
Lane Technologies
Wheel Bed (Skatewheel)
Rows of small skatewheels on axles. Most common and economical. Works well for flat-bottomed cartons 5–50 lbs. Multiple wheel rows handle different carton widths. Easy to reconfigure lane widths by moving dividers.
Roller Track
Full-width steel or plastic rollers. Better for heavier cartons (20–100+ lbs) and irregular bottoms. More robust than skatewheels but higher cost per lane. Ideal for case-pick operations with standardized case sizes.
Tilted Shelf Pans
For very light items or polybags that won’t roll on wheels. Tilted solid shelves with a lip at the front. Simplestand lowest cost but limited to light, small items. Common in pharmaceuticaland cosmetics fulfillment.
Pick Module Integration
Carton flow rack reaches its full potential when integrated into multi-level pick modules — elevated platforms with flow rack, conveyors, and pick-to-light systems working together.
📦 Multi-Level Pick Modules
Stack 2–3 levels of carton flow rack on a mezzanine structure with conveyors running through each level. Pickers on each level fill ordersand place them on the conveyor. Completed orders flow down to packing stations automatically. Multiplies your pick positions per square foot by 2–3×.
💡 Pick-to-Light
LED lights mounted on each flow lane light up to show the picker which SKU to pick and how many. Eliminates paper pick lists, reduces errors to near zero, and increases speed by 30–50% vs. paper-based picking. The investment pays for itself in reduced errorsand faster fulfillment.
🔄 Conveyor Integration
Conveyors running along the pick face transport completed cartons to packing, sorting, or shipping. Eliminates walking to drop-off points. In high-volume operations, this integration turns individual pick stations into a continuous flow of orders — matching or exceeding automated systems at a fraction of the cost.
📊 ROI Example
A typical e-commerce fulfillment center processing 5,000 orders/day can increase throughput by 40–60% by switching from static shelving to carton flow with pick-to-light — without adding headcount. At $15–$20/hour labor cost, that’s $200,000–$400,000/year in labor savings. Request a carton flow ROI analysis →
What Affects Carton Flow Rack Cost?
Carton flow rack pricing depends heavily on the lane type, depth, and integration level. Here’s what drives the investment.
🛤️ Lane Type & Depth
Skatewheel lanes are most economical ($50–$150/lane). Full roller tracks cost 2–3× more but handle heavier cartons. Deeper lanes (8 cartons deep vs. 4) cost proportionally more. Match lane depth to your replenishment frequency — too deep wastes money, too shallow causes stockouts.
📐 Number of Levels
More levels = more SKU facings per linear foot. Typical installations run 4–8 levels of flow lanes per bay. Higher levels need consideration for ergonomic picking heights — the top and bottom levels may be used for slower-moving SKUs accessed less frequently.
🏗️ Integration Complexity
Standalone carton flow bays are the simplestand cheapest option. Multi-level pick modules with conveyors, pick-to-light, and mezzanine structures are significantly more complex — but deliver transformational productivity gains. Start simple and add automation as volume justifies it.
Inspection & Maintenance for Carton Flow Rack
Carton flow rack has moving parts (wheelsand rollers) that wear over time. Simple maintenance keeps pick operations running at full speed.
Maintenance Focus Areas
| Component | Check For | Frequency |
|---|---|---|
| Wheel/roller spin | Stuck or frozen wheels, debris jams, worn bearings | Monthly |
| Lane tilt angle | Correct pitch for carton flow — too steep = damage, too flat = jams | Quarterly |
| Lane dividers | Bent, loose, or missing dividers causing carton crossover | Monthly |
| Front stops | Damaged or missing stops that prevent cartons from falling off pick face | Monthly |
| Beam & upright integrity | Standard pallet rack inspection — dents, plumb, connections | Quarterly |
🔧 The #1 Issue: Debris in Lanes
Packing tape, shrink wrap fragments, labels, and cardboard scraps are the most common cause of lane jams. A stuck wheel stops the entire lane. Train workers to keep lanes clean and schedule monthly lane cleaning. Schedule a carton flow system review →
Frequently Asked Questions
Yes — carton flow tracks are designed to drop into standard pallet rack bays. If you have existing selective rack, you can convert specific bays to carton flow without replacing the rack structure.
Typically 4 to 8 cartons deep per lane, depending on bay depth and carton size. Standard 48″ deep pallet rack bays accommodate 4–6 cartons; deeper bays can hold 8+.
No. Carton flow is 100% gravity powered — the lanes are tilted slightly so cartons roll forward on wheels or rollers. No electricity, no motors, no maintenance on drive systems.
Adjustable lane dividers let you configure different lane widths within the same bay. Wheel bed tracks handle varied bottom surfaces better than rollers. Many operations dedicate different bays or levels to different carton sizes.
Most operations see 2–3× improvement in picks per hour compared to static shelving. The gains come from reduced walk time, instant SKU visibility, and eliminated search time.
Same concept, different scale. Pallet flow rack moves full pallets on heavy-duty rollers. Carton flow moves individual cartonsand cases on lighter wheel beds or rollers within a pallet rack bay.
Explore More Pallet Rack Solutions
Ready to Speed Up Your Picking Operation?
Material Handling USA designsand installs carton flow rack systems for distribution centers, e-commerce fulfillment, and manufacturing operations nationwide. Free design consultation and layout.
Online Store
Shop at MaterialHandling-USA.com
Need rack components or warehouse supplies? Shop online for fast delivery:
Warehouse Equipment & Supplies
Pallets
Stretch Wrap & Shrink Film
Shipping Labels & Tags
Shop pallet rack & accessories →