Roller Shade Cordless Spring Box

Cordless Roller Shade Replaceable Spring Box

Replacement spring box for cordless roller shade lift systems. Provides smooth, quiet lifting with controlled tension and consistent stop positions.

How to Select the Correct Spring

Select the spring code based on the shade width. Wider blinds require stronger spring tension.

Roller Blinds:
20–30" → AR
30–40" → HR
40–50" → BR
50–60" → CR

For privacy fabric, recommended when Width > Height × 0.3.
For sunscreen or blackout fabric, recommended when Width > Height × 0.4.