Floor Spring Installation: Plan the Pivot and Finished Floor

A concealed floor spring needs more planning than a neat cover plate. Before a new shop or office floor is closed up, confirm the exact closer, pivot arrangement and finished-floor level with the installer.

Use the right installation drawing

dormakaba's BTS80 library lists separate packages for centre-hung, offset, single-action and double-action doors. Match the exact model and package; dimensions from another floor spring are not a substitute for its template.

Check the floor box and pivot

• For BTS80, the maker's instructions require the cement-case top to be flush with the finished floor, with the case level and parallel to the frame.
• The spindle centreline must be accurately located for the door's pivot point. Have the installer verify this before permanently fixing the box.
• Confirm the specified door arm, top pivot, spindle and clearances against the chosen system's drawing, not just the visible cover size.

The CISA F5003/4 guide likewise requires levelling and securing its closer in the supplied box. It warns against dismantling the body because it contains a pre-stressed spring under pressure.

Use a qualified installer rather than improvising around a poorly positioned box. For control terminology, see our door-closer settings guide.

Sources checked 6 November 2026: dormakaba library updated 1 May 2026; CISA guide July 2025.