Gravity Conveyor Roller Manufacturer | Engineering-Driven Custom Solutions

• Roller Diameters:
  Metric tubes from Ø25 mm to Ø108 mm, plus exact imperial tubes for North-American specs. We hold the true 1.9″ tube at Ø48.26 mm — not a nominal Ø50 mm substitute — so replacement rollers fit existing 1.9″ conveyor frames. All tube and shaft diameters can be fully customized to your technical drawings.
• Internal Thread Installation:
  Provides a flush finish and high structural stability.
• External Thread Installation:
  Ideal for secure fastening with nuts under heavy load.
• Spring-Loaded Shafts:
  Designed for rapid installation. Supports 7/16″ and 11/16″ hex sizes.
• Milled Flat Shaft Ends:
  Used for orientation within frame slots to prevent axial rotation.
• Semi-Circular Ends / Pin-Hole Mounting:
  Specialized options for custom industrial frames.

Other diameters — including 1-3/8″ (Ø34.9 mm) and the full Ø25–Ø108 mm metric range — are available made-to-order.

Bulk Replacement Rollers for Existing Gravity Roller Conveyors

We supply replacement gravity rollers the way a factory does — by the batch, built to your sample or drawing — for distributors restocking, OEMs, and operations re-rollering a worn line or section. For one or two emergency spares a local supplier will be faster; where we win is matched specs and factory-direct pricing across a full line or a repeat order.

When rollers on a line start to seize, flat-spot, or lose bearings, it pays to replace the whole roller, not just the bearing. A bearing rarely fails overnight, so by the time one runs rough or seizes it has been wearing for a while — and as it wears, its fit in the seat loosens and the bearing seat in the tube end is usually worn too. A fresh bearing pressed into a worn seat still won’t run true, so the reliable fix is complete new rollers. A gravity roller is one pre-assembled unit — tube, bearings, and shaft built together as a sealed assembly, not separate parts — so there is nothing in the old rollers to reuse; you re-roller the run with matching units and the frame stays as it is.

The risk in replacement buying is a unit that looks close but isn’t exact. Get the tube outside diameter wrong and the roller still bolts in — but its surface sits higher or lower than the rollers around it; a Ø50 mm (1.97″) metric tube dropped into a line built on true 1.9″ (Ø48.26 mm) tube, for instance, stands almost 1 mm proud, so every load takes a small step as it crosses that roller. Whether the roller installs cleanly comes down to the installation dimension — the mounting length that has to suit the frame for the end type, not a single overall shaft length. An internal-thread roller sits between the two frame channels and is bolted in from the outside through the side holes, so its body length has to match the inside frame width; a spring-loaded roller’s axle tips compress to drop it in and then spring out through those same holes, so it is the length over the extended tips that has to be right. Both end types fit the same frame when built correctly, but they don’t behave alike — spring-loaded ends carry more axial float so they fit quickly, while internal-thread ends sit tighter and more located — so matching the original keeps the replacement running under the same conditions.

An exact diameter is still only one piece of this — a true 1.9″ is Ø48.26 mm, but that says nothing about the roller face length, the installation dimension, the wall thickness, or the mounting method. A quick tape measurement on the line is easy to get slightly off, so the dependable references are the original drawing — where it carries the actual dimensions, it often tells us everything we need — or a worn roller sent in as a physical sample, and either one lets us copy the roller exactly across the batch. Before anything goes into production, we return a manufacturing drawing for your sign-off, so both sides have confirmed every dimension before we cut any metal — no batch built to the wrong size.

• Tube outside diameter (and wall thickness) — the OD sets where the roller’s surface sits relative to its neighbors, so it has to match the rest of the line: a true 1.9″ tube is Ø48.26 mm, 2.5″ is Ø63.5 mm, and 3.5″ is Ø89 mm, and none of these is interchangeable with the Ø50 mm (1.97″) metric tube — mixing them leaves a step that makes loads bounce. Wall thickness sets the load rating, so confirm it if the line runs heavy.
• Roller face length — the usable carrying length of the tube, the surface that actually moves your product. Match it so the replacement gives the same effective conveying width as the rollers it runs alongside; this is about how the line works for you, separate from how the roller mounts.
• Between-frame width and mounting method — give us the inside width between the side channels and how the roller mounts: spring-loaded (hex 7/16″, 11/16″), internal thread, external thread with nuts, milled flat, or semi-circular / pin-hole. Together these fix the installation dimension, which differs by end type — for the same frame, a threaded end (bolted in between the channels) and a spring end (tips pushing out through the side holes) need different lengths. Both install when built right, but they don’t behave the same: spring-loaded ends allow more axial float for quick fitting, internal-thread ends sit tighter and more located, so match the original to keep the same running conditions.
• Quantity, finish, and operating environment — give us the batch or line quantity and any duty or environment requirement, such as stainless or a PVC sleeve for food, pharma, or wet zones, so the replacement matches both fit and service conditions.

Send a worn roller or a dimensioned drawing and we will match it across the batch, run-out tested to ≤ 0.5 mm/m, and quote it at line or repeat-order quantity.

Welded Structures & Deflection Control

• Heavy-Duty Welded Bearing Housings:
  For heavy industrial applications, we utilize steel welded housings. Unlike standard pressed housings, the welded structure prevents end cap deformation or detachment under extreme stress.
• Internal Support Plug Technology:
  For extra-long rollers, we install customized Internal Support Plugs to constrain shaft movement, eliminating abnormal noise and protecting bearings from wear caused by Shaft Deflection.
  (Learn more: Long Roller Stability Solutions)

Specialized Surface Protection

• Protective Coatings:
  We offer soft PVC Sleeve Coating or high-wear PU (Polyurethane) coating to prevent scratching sensitive materials like furniture boards.
• Advanced Finishes:
  Beyond standard Zinc Plating, we provide Chrome plating, Nickel plating, and high-durability metallic paint.
• Extreme Environments:
  Customized grease and bearing configurations for Cold Chain (-50°C) or High-Temp (180°C) operations.
  (Learn more: Cold Storage Roller Selection Guide)

Recommended load capacities for typical 1-meter gravity conveyor rollers:

Expert Advice: If your existing specifications are performing well, we recommend maintaining the original configuration to avoid unnecessary costs.

If you are struggling with selection for long-span rollers or extreme environments, contact us with your basic requirements. We will provide a proven engineering recommendation based on our documented project case history.

For other roller types, compare our heavy duty, stainless steel, and sprocket rollers, or browse the full conveyor roller range.

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