Every jewelry showcase is built square. Almost no retail floor is truly flat. Polished concrete slabs typically vary 3–5 mm over a 3 m span, and older buildings—tile from the 1980s, raised timber over joists, basement showrooms—can drift 8–12 mm across a single display run. When a glass case sits on that surface without correction, the base frame absorbs the difference as torsion. Doors stop closing flush, drawer runners bind, and glass panels pick up stress that shows up months later as a hairline crack at a corner joint. Jewelry showcase leveling is therefore not a finishing detail—it is part of the store plan, decided before the first plinth is unloaded from the crate. This guide covers how to survey, specify, install and verify adjustable feet so cases sit flat, load evenly and stay that way through years of store resets.
Survey the floor before you fix tolerances
Start with a floor map, not with the cases. Walk the planned showcase footprint with a 2 m straightedge and a digital level, or better, use a laser line and record deviations at 500 mm intervals. Mark every high point and hollow directly on the floor with chalk and photograph it. A 300 mm grid is dense enough for long perimeter runs; use 150 mm around tower cases and corners, which is where twist hides.
Convert what you find into a specification. A practical working rule: if the floor deviates more than 4 mm over 2 m, order adjustable feet with at least 30 mm of travel rather than standard 15 mm pads. Allow 5–8 mm of extended thread to remain visible after adjustment—thread showing nothing means the foot is bottomed out and has no reserve. For glass cases over 1,500 mm wide, plan two row of feet along each long edge plus feet at the centre, roughly 500–600 mm apart, so you can correct a hollow without levering the plinth. Send the floor map to your manufacturer with the order; a supplier such as Libafang can then match foot travel, load rating and thread size to your actual building rather than a catalogue average.
Choosing the right adjustable feet and hardware
Most showcase leveling feet fall into three families. Threaded stem foot: a steel or stainless stud screwed into a fixed nut or insert in the base frame, giving typically 20–50 mm of height range and fine 1 mm adjustment. Fixed-base leveller: a housing bolted under the plinth with a hex adjuster, best where the case has a plinth skirt that hides the mechanism. Caster and leveller combo: a glide wheel for moving during install, then a footpad wound down to take the load—useful for heavy museum cases that need repositioning during fit-out.
Match load rating to real weight, not just glass and frame. A 1,200 mm jewellery showcase with a slate base and LED driver can easily reach 120–160 kg; add 20% headroom per foot and divide by the number of feet. A 60 kg foot rating is fine for four feet under a 150 kg case, but put six feet under anything longer than 1,500 mm or any case with a stone top. Choose materials for the floor: nylon or rubber pads on tile and timber to prevent scratching and to damp rattle, stainless pads on stone showrooms, and pads with a slight crown on carpet so the foot does not sink into pile. Check thread pitch as well—M10×1.5 is common, but fine pitch (M10×1.0) gives more precise adjustment on premium watch cabinets.
Installation sequence that avoids twist
Set feet at neutral when cases arrive: wind each foot down until it touches the floor, then a quarter turn up. Never level one corner fully before the others—work in fractions.
- Lay a laser line or chalk a 1 m reference line parallel to the showcase run at a fixed height.
- Place the case in final position and identify the highest floor point under it; that foot becomes the reference and stays fixed.
- Adjust the lowest feet first, bringing them up slowly, checking the laser at 500 mm intervals along the front edge.
- Check diagonal cross-measurements across the case to confirm the frame is square, not just level.
- Torque lock nuts once each foot bears load; this prevents creeping after the cases are loaded.
- Load the case with typical display weight, then re-check level and tightness after 24 hours.
Do not shim under a levelling foot to save thread. Shims hide the true gap, compress under load and leave the foot floating. If you run out of travel, the floor is out of tolerance for that foot—raise the case, add a solid plinth plate or pack under the spreader, and reset. Also keep feet at least 50 mm from case edges so the corner is not the only point of support.
When the floor is genuinely bad
Some showrooms need more than feet. If any point deviates more than 12 mm over 2 m, consider a levelling plinth or raised floor deck before installing cases; adjustable feet are designed for local correction, not for bridging structural slope. New concrete should be flat within 3 mm under a 2 m straightedge (roughly SR2), and if the slab is worse, arrange floor prep before the delivery date—rescheduling installation is cheaper than re-engineering a showcase base. On upper floors with timber joists, spread long runs across more feet and check for deflection with the case loaded, not empty.
Sign-off checklist
- Laser level verified along every front edge and across every diagonal.
- All lock nuts torqued and every foot bearing a share of the load.
- Thread extension recorded for each foot (photograph for the O&M file).
- Doors, drawers and lift mechanisms operated ten cycles under load.
- Glass and seals inspected for stress after 24 hours and again after one week.
- Floor marks cleaned, protective film removed, and adjustment range noted for future resets.
Treat jewelry showcase leveling as a documented installation step, and cases that would have rattled, jammed or cracked settle into years of quiet service. If you are planning a store fit-out or a museum gallery, tell us your floor deviations, case dimensions and display load, and Libafang will propose a foot specification, foot layout and installation plan with a detailed quote.
