Berta Store · Installation Guide
12-inch drawer slidesDrawer Slide Installation Video
Watch Berta's installation video for full-extension, ball-bearing side-mount drawer slides before starting your 12-inch drawer project.
Fit & Project Planning
A 12 inch rail needs the right width and mounting space
Treat drawer width as a separate measurement
Correct length does not solve an opening that is too narrow or out of square. Measure the cabinet opening at the front and rear and compare the required side clearance with the drawer-box outside width. Keep the rail assemblies parallel according to the installation instructions.
Use a clearance formula only with confirmed values
The planning relationship is drawer-box outside width = effective mounting opening minus the required clearance on both sides. For example, an 18-inch effective opening with a confirmed 1/2-inch allowance per side would suggest a 17-inch box. This is a conditional example, not a substitute for the product installation drawing.
Decide the mounting system before fabricating
This page offers standard side mounts. The linked soft-close side-mount and undermount families both list a 12-inch option, but an undermount drawer needs its own construction details, locking hardware and clearances. Do not cut one box design assuming all three systems will fit it.
Planning example: Twelve inches is 304.8 mm as a unit conversion. Check actual product measurements when replacing a nominal 300 mm slide; the names are not an assurance of a common mounting pattern.
12 inch drawer slide questions
Can I use these in a frameless cabinet?
A side-mount installation can be planned against suitable cabinet sides, but verify the mounting surface, drawer clearance and fastening instructions for the actual cabinet.
Do I need the face-frame brackets in every installation?
Not necessarily. The appropriate support arrangement depends on the cabinet construction. The listed pack includes brackets, but their presence does not replace a fit check.
Is a 12-inch undermount a direct replacement?
No. The nominal length may match, but mounting beneath the drawer introduces different box dimensions and hardware requirements.
Compare Other Drawer Slides
Find other sizes using the length selector above or browse the Drawer Slides collection. Compare each product's mounting specifications before substituting a different system.


