How to assemble a filing cabinet

Flat-pack filing cabinets and mobile pedestals need their drawers fitted on full runners that carry heavy paper. The interlock that stops more than one drawer opening at once is a safety feature, not an extra.

Time
about 1 h
Difficulty
Moderate
People
1 person
Steps
6

Tools needed

  • Allen key (supplied)
  • Cross-head screwdriver
  • Tape measure

Parts to check first

Before you start, lay everything out on a soft surface (the flattened box works) and check it against the parts list in your manual.

  • Carcass panels
  • Drawer boxes and fronts
  • Drawer runners and file rails
  • Castors or feet
  • Lock, interlock parts and anti-tip fitting

Step by step

  1. Step 1: Fit the runners to the carcass sides while they lie flat, checking left from right.

  2. Step 2: Build the carcass on its back and square it before fitting the back panel.

  3. Step 3: Fit the castors or feet to the base, with the locking castors at the front.

  4. Step 4: Build the drawers, add the file hanging rails and fit the drawer runners.

  5. Step 5: Fit the lock and the interlock parts exactly as the manual shows, then slide in the drawers.

  6. Step 6: Test that only one drawer opens at a time, and fix tall cabinets to the wall.

Common mistakes

  • Leaving out the interlock, so several full drawers can open together and tip the cabinet.
  • Putting the locking castors at the back where you cannot reach them.
  • Loading the top drawer with the heaviest files.

Safety notes

  • Fill filing cabinets from the bottom drawer up and open one drawer at a time.
  • Fix tall filing cabinets to the wall or to each other.

This is general guidance for this type of product. Your product's own manual comes first: follow its order, fittings and torque values where they differ from this page.

Updated 2026-09-30