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Adjustable Tandem Upper Roller Assembly for Sliding Doors

○ Material and color can according to customers' requirement.
○ We can make different size as per customers' requirement.
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Zhejiang Huaneng Micro Bearing Co., Ltd.+86-15058997617 Zhejiang Huaneng Micro Bearing Co., Ltd. shirley@cnhune.com / +8615058997617
Product Advantages
  • Smooth Operation
    The spacer design ensures smooth rolling and no jamming, even when screws are fully tightened.
  • Silent & High Load Pulley
    Combines quiet bearings with high load capacity for smooth, low-noise performance.
  • Durable Materials
    The nylon-coated outer layer offers strength, toughness, and fatigue resistance.
  • Precision Bearings
    High-quality bearing steel provides quiet, high-speed, and wear-resistant performance.
  • Sealed & Dustproof
    Metal dust cover ensures tight sealing; smooth surface with no burrs for refined quality.
Product Description
Product Overview
Adjustable Tandem Upper Roller Assembly for Sliding Doors
Material：PPSU/SS201
The adjustable tandem roller assembly is a complete sliding hardware component for aluminum doors and windows. It combines two bearing rollers, a stamped metal mounting bracket and an adjustment mechanism in one compact unit.

The dual-wheel structure helps distribute the load more evenly than a single-wheel roller and improves stability during opening and closing. The side adjustment screw can be used to adjust the installed position or running height, depending on the door or window profile design.

This product can be manufactured according to customer samples, drawings or aluminum profile dimensions.
Key Features
· Dual-wheel tandem roller structure

· Adjustable installation or running height

· Plastic-coated bearing wheels

· Smooth and quiet sliding performance

· Stamped metal mounting bracket

· Multiple mounting holes for profile installation

· Suitable for aluminum sliding door and window systems

· Custom wheel size, groove and bracket structure

· OEM and ODM manufacturing available
Applications
· Aluminum sliding windows

· Aluminum sliding doors

· Glass sliding doors

· Balcony sliding doors

· Patio doors

· Screen doors and windows

· Residential door and window systems

· Commercial aluminum profile systems
Customization Options
· Wheel diameter

· Wheel width

· Wheel groove shape

· Bearing model

· Bracket length and thickness

· Mounting hole diameter and position

· Adjustment screw structure

· Plastic material and color

· Metal material

· Surface treatment

· Logo and packaging
OEM/ODM Service
We manufacture customized sliding door and window roller assemblies based on customer drawings, physical samples or aluminum profile dimensions. Our production capabilities include bearing assembly, plastic injection molding, metal stamping, machining and surface treatment.

For a correct quotation, please provide:
No. Information Required
1. Product drawing or physical sample
2. Wheel diameter and width
3. Groove shape and dimensions
4. Bearing model or load requirement
5. Metal bracket material and thickness
6. Required surface treatment
7. Order quantity
8. Door or window profile drawing, if available
Measurement Method
Weight(g) ID(mm) OD(mm) Height(mm)
Payment Terms
1.100% T/T in advance
2.30% T/T deposit, 70% balance against copy of B/L
3. PayPal
Packaging Details: Standard export packing (plastic bag, carton, and pallet or wooden case), or as per customer's requirements.
Delivery Port: Ningbo / Shanghai
Delivery Time: Normally within 30 days for ready goods or as per customer's request.
ACTUAL PHOTOS
FAQ
  • What are your payment terms?
    What are your payment terms?

    1.100% T/T in advance2.30% T/T deposit, 70% balance against copy of B/L3. PayPalPackaging Details: Standard export packing (plastic bag, carton, and pallet or wooden case), or as per customer's requirements.Delivery Port: Ningbo / ShanghaiDelivery Time: Normally within 30 days for ready goods or as per customer's request.

  • How do you handle shipment?
    How do you handle shipment?

    For small orders: we ship via express (DHL, FedEx, UPS, TNT, etc.).For bulk orders: we ship by sea or by air, depending on your preference.

  • How long is the production lead time?
    How long is the production lead time?

    For in-stock samples: shipped within 2 days.For out-of-stock samples: lead time is within 7 days.For mass production: approximately 15 days after receiving the deposit.

  • What after-sales service do you offer for sliding rollers?
    What after-sales service do you offer for sliding rollers?

    We provide online technical support.  If the issue is caused by a quality defect, we will replace the defective items with new ones.

  • How does your factory ensure quality control?
    How does your factory ensure quality control?

    80% of our staff have over 10 years of experience.  We have a mature and skilled technical team along with a comprehensive quality management system to ensure consistent product quality.

  • Can we print our logo on the products?
    Can we print our logo on the products?

    Yes, we can print your logo on the products based on your design requirements.

  • Can we customize our own color box?
    Can we customize our own color box?

    Yes, if your order quantity reaches 1,000 sets, we can provide customized color box packaging.

  • Do you offer free samples?
    Do you offer free samples?

    Yes, we are happy to provide free samples for you to evaluate the quality.

  • Are you a manufacturer?
    Are you a manufacturer?

    Yes, we are a professional manufacturer specializing in door and window roller pulleys for over 20 years. We also have our own international sales department and handle both production and sales in-house.

  • How long does it take to receive a response after sending an inquiry?
    How long does it take to receive a response after sending an inquiry?

    We will reply to you within 6 working hours on business days.

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Zhejiang Huaneng Micro Bearing Co., Ltd.
Zhejiang Huaneng Micro Bearing Co., Ltd. specializes in the development and manufacturing of miniature and medium-sized bearings, non-standard bearings, and pulley systems. With over a decade of industry experience, we offer high-precision processing and responsive customization capabilities.As China Adjustable Tandem Upper Roller Assembly for Sliding Doors Suppliers and Custom Adjustable Tandem Upper Roller Assembly for Sliding Doors Factory. Our products are widely used in home appliances, industrial equipment, and door/window systems, and are exported to Japan, Korea, Europe, and beyond.
CONTACT US
Understanding Adjustable Tandem Upper Roller Assemblies
An adjustable tandem upper roller assembly is a small but important part in many sliding door and window systems. It is usually installed inside the aluminum profile and works with the track to help the sash move smoothly during opening and closing.

This type of roller assembly normally includes two wheels, bearings, a metal mounting bracket and an adjustment screw. The structure looks simple, but each part affects the final sliding performance. If the wheel size, groove shape or bracket position does not match the profile, the door may become noisy, difficult to move or unstable after installation.

For aluminum sliding systems, the roller is not only a moving part. It also helps control the running height, support the panel and keep the sliding movement aligned with the track.
Adjustable Tandem Upper Roller Assemblies
Why Two Wheels Are Used in One Assembly
The tandem design means that two rollers are arranged in one bracket. Compared with a single-wheel structure, two wheels can share the load more evenly and help the door or window move with better balance.

This is especially useful for wider aluminum sliding panels, glass sliding doors, balcony doors and patio doors. During daily use, the panel does not always move under perfect conditions. Dust on the track, slight profile tolerance or uneven force from users can all affect movement. A tandem roller structure helps reduce concentrated pressure on one wheel and makes the sliding action more stable.

The dual-wheel design can also help reduce shaking during movement, especially when the roller and track are properly matched.
The Function of the Adjustment Screw
The adjustment screw is designed to make installation and fine tuning easier. After the roller assembly is installed into the aluminum profile, the screw can help adjust the position or running height of the roller, depending on the profile structure.

In real installation work, aluminum profiles, glass thickness and track height may have small differences. Without an adjustment function, it can be difficult to correct the running position after assembly. An adjustable structure gives more flexibility and helps the door or window sit properly on the track.

A good adjustment design should be easy to operate, but also stable after tightening. If the screw structure is loose or poorly matched with the bracket, the running height may change after repeated use.
Wheel Material and Sliding Performance
The wheel material directly affects noise, wear resistance and the feeling of movement. Plastic-coated bearing wheels are commonly used in sliding door and window systems because they can provide smoother contact with the track and help reduce metal-to-metal noise.

PPSU material offers good toughness and dimensional stability. It is suitable for applications where the roller needs to maintain shape and performance during repeated sliding. The outer wheel surface should be clean, smooth and properly formed, because burrs or uneven edges may create noise or increase friction.

For daily residential use, quiet movement is often important. For commercial aluminum systems or doors used more frequently, wheel strength, bearing performance and long-term wear resistance should be checked more carefully.
Metal Bracket Structure and Installation Fit
The metal bracket keeps the rollers in position and connects the assembly to the aluminum profile. Its length, thickness, hole position and stamping shape must fit the installation space correctly.

SS201 is often used for hardware parts where strength and cost balance are both considered. The bracket should have enough rigidity to hold the wheels during movement. If the bracket is too thin or the mounting holes are not accurate, the roller may shift during use.

When checking a roller assembly, the bracket should be reviewed together with the profile drawing or actual sample. Even a small difference in hole distance or bracket height can affect installation.
Important Dimensions to Confirm
Sliding door and window rollers are often customized because aluminum profile systems are different from one market to another. Before production, the following dimensions are usually important to confirm.
Item What to Check
Wheel diameter It affects the running height and the contact position with the track.
Wheel width It should match the track width and avoid rubbing against the profile.
Groove shape The groove should fit the rail shape for smooth and stable movement.
Bearing model It is related to load support, rotation smoothness and service life.
Bracket size The bracket must fit inside the aluminum profile without interference.
Mounting holes Hole diameter and position should match the profile installation method.
Adjustment range It should allow enough fine tuning after installation.
Matching the Roller with the Aluminum Profile
A roller assembly should be selected according to the aluminum profile, not only by appearance. Some rollers look similar from the outside, but the internal height, hole position or wheel groove may be different.

For new door and window projects, it is helpful to confirm the roller together with the profile section drawing. This makes it easier to check the installation space, track position and adjustment direction before making samples.

For replacement parts, an actual sample is often the most direct reference. The wheel diameter, total height, bracket shape and screw position should be measured carefully. This can reduce the chance of installation mismatch.
Common Applications
Adjustable tandem upper roller assemblies can be used in different sliding systems, including aluminum sliding windows, aluminum sliding doors, glass sliding doors, balcony doors, patio doors, screen doors and commercial profile systems.

In residential systems, smooth and quiet movement is usually the main concern. In commercial or frequently used systems, the focus is often on stable running, stronger support and consistent performance after long-term use.

The final choice depends on the door or window size, panel weight, profile structure and track design.
Customization for Different Door and Window Systems
Since aluminum door and window profiles are not all the same, roller assemblies are often made according to drawings, samples or profile dimensions. Customization can include wheel diameter, wheel width, groove shape, bearing type, bracket size, mounting holes, adjustment screw structure, plastic material, metal material and surface treatment.

For products that need to match an existing profile system, it is better to provide a clear drawing or physical sample. If the profile drawing is available, the roller can be checked according to the internal space and track structure.

Surface treatment and material selection should also be considered according to the use environment. For humid areas or outdoor applications, the metal parts and bearing protection need more attention.
Practical Notes Before Production
Before production, the most useful information includes the product drawing, physical sample, wheel diameter, wheel width, groove dimensions, bearing model, bracket material, bracket thickness, surface treatment requirement and order quantity.

If the door or window profile drawing is available, it can help confirm whether the roller assembly fits the installation space correctly. This is especially important when the roller needs to be used in a specific aluminum profile system.

A well-matched roller assembly should install smoothly, adjust properly and run steadily on the track. Paying attention to these details at the beginning can save time during assembly and reduce problems after installation.