Fittings school

Flush bolts

Fitted as a bolting device on double leaf door-sets in the passive door leaf. (The passive door leaf is the one more seldom used for passage.)

For a comparison of functions and properties see: OLDA Flush bolts guide

Manual flush bolt

Both release and bolting of the passive door leaf is made manually. All our manual flush bolts is operated by a lever-mechanism.

Automatic flush bolt

Release of passive door leaf is done automatically, when the active door leaf is opened, and the falling latch is released. Bolting is obtained automatically when active door leaf closes, when the falling latch is pushed in and thereby activates the bolt. Automatic flush bolts is often recommended where fire-proof demands exists.

Semi-automatic flush bolt

Release of passive door leaf is done manually. Bolting is obtained automatically when passive door leaf closes. The bolt is constantly activated, which means that this flush bolt can usually only be fitted at the top of the passive door leaf. Recommended as a complementary product where an automatic flush bolt is installed at the bottom of the passive door leaf. This installation results in an easy made manual releasing sequence and a secure bolting sequence in two steps, which also contributes to a smoother closing of the door-set.

How to choose the right type of flush bolt?

OLDA automatic and semi-automatic flush bolts are ordered and fitted according to the following:

If left door-leaf is passive:

Choose flush bolt type2 for top fit
and type1 for bottom fit.

If right door-leaf is passive:

Choose flush bolt type1 for top fit
and type2 for bottom fit.

The “passive” door-leaf is the one normally not used for passage.

Type of OLDA flush bolt – guide (pdf)

Non-spring-loaded or spring-loaded function on the automatic bolt?

In many door environments, a non-spring-loaded function is desired on the automatic bolt. This is to ensure that the door is fully bolted, for example with regards to fire safety aspects.

But in some cases a spring-loaded function is desired instead. This is often requested when the keeper of the door, aim for that the frame or door leaf will not be damaged – if the bolt in any way is obstructed from reaching its activated position, e.g. by a blocked lock plate.


For the respective product, should the recommended accessories and screws we have assigned, be used to largest possible extent. This is to ensure safe function and long durability for the product. For flush bolts, this could be for example lock plates, strike plates and guide tubes.When installation is made in another door environment than the intended, could alternative accessories be necessary. Also the choice of fastening, e.g. the type of screw, should obviously also be adapted according to material etc.

In many cases can different accessories also enhance the look or optimize the function further, i.e. by a well designed, dust-excluding floor socket – which prevents gravel and dirt from blocking the hole for the bolt in floor or sill.

OLDA flush bolt accessory guide (pdf)

OLDA flush bolt accessories

Complementary door hardware


Door coordinators

A prequisite for automatic flush bolts, most locks and also rebated door leaves – is that the door leaves in the double door, closes in the correct order. This can be ensured by a coordinator.











Opening limiters / door buffers

To prevent the door or handle to damage the wall or interior, one of our door stops can be used:



Frame bridge

If a concealed drawing of cable from frame to door leaf is desired, we can recommend our frame bridge.