25*13*138mm Iron Steel Housing Sliding Roller 606zz High Carbon Steel Bearing

• 1. 25*13*138mm: This is most likely the overall dimensions of the roller housing or bracket, not the bearing itself.

     • 25mm: Probably the width or height of the mounting plate.

     • 13mm: Likely the thickness.

     • 138mm: The most critical dimension – the length of the bracket or the distance between the wheel axles if it's a tandem (two-wheel) roller. This is the key measurement to match your window frame's channel.

  2. Iron/Steel Housing: The main structural bracket is made from stamped or pressed steel, often galvanized or coated to prevent rust.

  3. Sliding Roller & POM Material Wheel: This is the core functional part.

     • POM (Polyoxymethylene): Also known as Acetal or Delrin. This is an excellent engineering plastic for this application. It's very hard, smooth, has low friction, is wear-resistant, and won't corrode or mark the window track. This is a standard and good quality material for the wheel.

  4. 606zz High Carbon Steel Bearing:

     • 606zz: This is a specific bearing size. 6 indicates a thin-section, light-duty bearing. 06 means it has a 6mm inner bore (the hole for the axle) and a 19mm outer diameter. ZZ indicates it has metal shields on both sides to keep dirt out and grease in.

     • High Carbon Steel: This refers to the material of the bearing's rings and balls (Chrome Steel, GCr15 is common). It provides good durability for this application.

  What This Assembly Is:

  This is a replacement bottom roller for a sliding window or door. The steel housing gets screwed into the bottom of the window sash (the moving part), and the POM wheels, rotating on the 606zz bearings, run inside the track of the window frame.

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  How to Find and Buy a Replacement:

  1. Priority #1: Match the Physical Dimensions.
  The 138mm length is the most crucial. Even a few millimeters off can make it unusable. Carefully measure your old roller:

  • Remove the window sash.

  • Unscrew the old roller from the bottom.

  • Measure the total length (L), height (H), and width (W) of the bracket.

  • Measure the distance between the centers of the two wheels if it's a tandem roller.

  • Take clear photos of the old roller from all angles.

  2. Search Keywords for Online Markets (AliExpress, eBay, Amazon, specialized hardware sites):
  Use combinations of these terms:

  • "UPVC window roller 138mm"

  • "Sliding window replacement wheels 606zz"

  • "PVC window sliding roller POM wheel"

  • "Tandem roller for sliding window"

  • Include "25mm" or "13mm" if needed, but focus on the 138mm length.

  3. Alternative: Search by Window Brand/System.
  If you know the brand of your window (e.g., Veka, Rehau, Aluplast, Schüco, etc.), search for "[Brand Name] replacement bottom roller." Many profiles have specific compatible rollers.

  4. Consider Buying a Complete Set.
  It's often a good idea to replace all the rollers on a window (usually 2 or 4) at the same time to ensure smooth, even operation.

• Aluminum Sliding Windows
• Aluminum Sliding Glass Doors
• Patio Doors
• Balcony Doors
• Commercial and residential sliding systems

1. Remove your old roller wheel from the window frame
2. Measure the outer diameter of the old wheel
3. Measure the width (thickness) of the old wheel
4. Measure the diameter of the center axle pin hole
5. Confirm measurements match our 25mm (OD) × 20mm (W) size

• B2B/Wholesale: 100 pieces per carton in secured plastic bags
• B2C/Retail: Consumer-friendly blister packs (2 or 4 pieces) with Arabic/English installation guide

• Professional pre-sale consultation and product guidance
• Efficient order processing with advance delay notifications
• Comprehensive after-sale support including warranty coverage
• Custom solutions and OEM/ODM services available

We operate our own factory and handle all trade activities directly.

5-10 days for in-stock items, 25-35 days for larger quantities requiring production.

Yes, though customers must pay freight costs which can be refunded against future orders.

Yes, we can customize products according to your specifications or drawings.