Centre Opening Sliding Doors

Other Frequently Asked Questions

Q. What are the recommended measuring deductions for Centre Opening Sliding Screen Doors?

A. We can only advise the standard allowances. Some doors may have individual quirks. Please provide measurements in millimetres. The measurements you provide will be the exact measurements your door will be fabricated. Please check your tape for accuracy. Measure your door from the outside looking in.

Standard drop deductions - 12 mm.

Standard width deduction: Measure the overall width of the opening from the back of the receiving interlock on the left door to the the back of the receiving interlock on the right, deduct 6 mm and divide by two, this will give you the width measurement for each door.

Q. What are interlocks?

A. The purpose of interlocks is to lock the back of the sliding door into the fixed panel simultaneously as the door is closed into the locking position, this ensures that the door is locked on both sides. A frame interlock is fixed to the back of the sliding door at the point of installation so as to have it interlock with the receiving interlock which is located on the fixed glass panel.

There are three different sized receiving interlocks:

  • 3 mm offset interlock
  • 7 mm offset interlock
  • Flat interlock

Door widths:

When measuring the widths for centre opening sliding doors that do not have receiving interlocks and will need to have a receiving interlocks fitted then the following procedure for measuring needs to be adhered to.

For 3 mm and 7 mm offset receiving interlocks measure from the back of the fixed glass panel on the right-hand side to the back of the fixed glass panel on the left-hand side, deduct 6 mm and divide this measurement by two for the individual door sizes to be ordered.

For flat interlock measure from the back of the fixed glass panel on the right-hand side to the back of the fixed glass panel on the left-hand side. Add 14 mm to this measurement and divide by two for the individual door sizes to be ordered. No deductions will be necessary.


Q. What if my door does not have a receiving interlock.

A. Receiving Interlocks are required for Centre Opening Sliding Screen Doors and can be purchased from Seconline; contact the office for assistance 1300 735 405.

Q. Why do you need a centre of the door handle height?

A. To manufacture your door with the handle compatible with your existing handle for both sliding and hinged doors.

Q. How far above or below our existing solid door handle do we put our required handle height?

A. Below the existing solid door handle, then measure down a minimum of 65 mm from the bottom of the existing solid door handle to the centre of where you require the new handle . This allows the minimum distance required.

   Above the existing solid door handle,  measure up 125 mm from the top of the existing solid door handle to the centre of where you require the new handle. This allows the minimum distance required. 

Q. Do you have a showroom that I can visit?

A. No we don’t. Please refer to our photo Gallery.


Q. What Powder Coat colours do you use?
A. Colours are standard Interpon and Dulux Powder Coat colours.


Q. Can I have another Colour if I am willing to pay for it?
A. Yes. Prices will have to be individually quoted. Please email info@seconline.com.au


Q. Do you do Security Grilles? 
A. Yes, we sell 316 Marine Grade Stainless Steel mesh security grilles.


Q. How does your door compare with other similar doors?
A. We offer no comparisons to any other similar products. Our doors are as described. We stand by our quality, service and warranties as described.


Q. How long does it take?
A. The door is manufactured within 7 working days from receiving your measurements. Shipment usually takes one to four days. Once goods are dispatched with Regional Road Express you will be sent a dispatch notification.


Q. Can I pick the door up?
A. If you live locally yes, otherwise we ship Australia wide.

Q. Do you discount for multiple doors?
A. No, however we can discount freight for multiple items.


Q. Can multiple doors be made keyed alike?
A. Yes, in lots of ten.

Q. Can the door be made out of square?                                                                  

A. No.

Q. What is the thickness of the door frame?

A. Standard 20 mm