Häfele Matrix Box S Slim Drawer Calculator

From Häfele's Matrix Box S Slim catalogue pages (10.85A to 10.85D) and fitting instructions. Häfele state that their dimensional data is not binding, so check the first drawer against the hardware.

The system

• Slim 13 mm drawer sides in black, anthracite or grey.
• Full-extension soft-close runners rated at 35 kg per pair. The fitting instructions also show a 50 kg runner in 450 to 550 mm lengths, with a third rear bracket.
• Supplied as a kit of sides, runners, front and rear brackets and cover caps. You add your own 16 or 18 mm board base and back.
• Side heights 84, 135 and 199 mm in the UK catalogue. The fitting instructions also show 64 and 167 mm sides.
• Runner lengths 270, 350, 400, 450 and 500 mm in the UK catalogue, with 300 and 550 mm in the fitting instructions.
• Front adjustment of ±2 mm in height and ±1 mm side to side. Fronts on 84 and 135 mm sides unclip in one step, and on 199 mm sides in two.

Cutting sizes

LW is the internal cabinet width and NL the nominal runner length.

For example, a 600 mm cabinet with 18 mm sides is 564 mm inside, so the drawer is 524 mm wide inside. For drawers over 800 mm wide, Häfele recommend a trial installation and the wide-drawer front fixing.

Runner lengths

Heights and front fixing

• The runner's lower row of front bracket holes sits at least 33 mm above the cabinet floor.
• The lowest front fixing hole is at least 47.5 mm above the bottom edge of the front, and 15.5 mm in from the inside face of the cabinet side.
• Drill the front Ø2 × 12 mm for wood screws, or Ø10 × 12 mm for the anchor bolts.

Runner screw positions

• Front bracket: 37 and 69 mm back from the front edge of the cabinet side.
• Rear bracket: 261 and 293 mm.
• 50 kg runners, 450 to 550 mm: a third bracket at 389 and 421 mm.
• The UK catalogue drawing dimensions the rear bracket holes at 224, 256 and 288 mm from the first front hole, depending on runner length. Use the bracket holes that line up with the 32 mm system.