78.1mm Spring & Roller Assembly – Suits Screen Doors

A direct replacement spring and roller assembly for screen doors. Concave roller on a tension spring. Acetal roller, no bearing. Suits old Trimview® and others. Note: the original spring was metal.

Key Features

• Acetal construction
• Concave acetal roller, no bearing
• Tension spring
• Overall 76.7 x 78.1mm
• Australian stock, dispatched within 1 business day

Fits & Replaces

• Direct replacement for older Trimview® sliding screen door spring and roller assemblies, and others of this pattern.
• Fit is decided by the overall assembly size of 76.7 x 78.1mm and by the concave roller face — a concave roller runs on a round or bar track, so check your old roller profile before ordering
• Print the Actual Size Identifier below and lay your old part straight onto it — that confirms the fit in seconds

Specifications

• TradeBase SKU: ASMSPR78
• Material: Acetal
• Overall size: 76.7 x 78.1mm
• Roller profile: concave

Installation Tips

• Check the track before you fit. File any burrs or flat spots smooth — a damaged track will chew out a new roller within weeks.
• Clean all grit and old grease out of the track. Grit is what kills a roller, not load.
• Note which way the spring sits before you take the old assembly out — fitted back to front it will not hold tension.
• Do not stretch the spring to make the assembly reach. If it will not sit at its natural length it is the wrong part.
• Slide the door through its full travel before refitting the stops.

Care & Maintenance

• Use a dry lubricant only — silicone or dry PTFE. Oil and grease hold dust and grind the roller.
• Sweep the track out every few months, more often in coastal or dusty areas.

Warranty

Covered by our 12-month warranty and your rights under the Australian Consumer Law.

Check the fit before you buy

Download the TradeBase Actual Size Identifier (PDF) and print it on A4 at 100% / Actual size — not Fit to page. The part is reproduced at true 1:1 scale on a 10 mm grid and measures 76.7 mm overall. Lay your existing part straight onto the page to confirm it matches. A calibration bar on the sheet lets you check the printer has not scaled the page.