Views: 26 Author: Site Editor Publish Time: 2026-09-15 Origin: Site
A floor spring bulk order carries one risk that a single-unit order does not: the same model goes into every door on the project. If that model is wrong for the door, the mistake is repeated at every opening.
Commercial glass doors vary more than they look. A lobby entrance panel and a meeting room door in the same building can differ in weight and in width. Both of those change which floor spring model fits.
Specification sheets, drawings and written confirmations take time to collect. They take less time than replacing hardware after the floor finish is down. This article sets out six items to confirm with your supplier before a bulk order goes into production.
Door weight sets the load rating a floor spring needs. Door width sets the torque it has to control. Both belong in the model selection, and on their own neither one is enough.
The pattern that follows an underspecified model is fairly consistent. The hydraulic body runs overloaded, seals wear earlier than they should, and the unit starts leaking oil or producing noise through the closing cycle. Closing force drops away at the same time, so the door stops latching cleanly. None of that appears on the first day. It appears some months into service, when the doors have been handed over and getting back into the floor is inconvenient.
On a bulk order, that failure appears on every door specified with the same model. Confirming the match before production starts is the less expensive version of that conversation.
Load rating is model-specific, not a range that any unit in a catalogue covers. Jianlai's floor spring range spans door weights from 80 kg to 300 kg across different models, and each model also carries a door width limit set by the torque it has to manage. The data sheet for the specific model number is the document to work from.
Send your supplier three numbers:
Verified door weight
Door leaf width
Single or double leaf configuration
The weight figure is worth getting from the glazing contractor rather than estimating. Glass weight climbs quickly with thickness, and moving a panel from 8 mm to 12 mm on a large leaf can add enough mass to push the door into the next capacity tier.
Door width is the item that gets skipped. Two doors can weigh the same and still load a floor spring differently, because a wider leaf puts more torque through the spindle. A model selected on weight alone can sit at the edge of its adjustment range from the day it is installed, which leaves the installer nothing to work with during commissioning.
Ask for the model number back in writing, together with its rated capacity. Then put that model number on the purchase order, not a product photo and not a catalogue description.
Where a door falls between two floor spring capacity tiers, the conversation to have is with the supplier rather than with the catalogue page. Sending the real numbers and asking which model they would specify puts the selection on record, and it gives you something to refer back to if the model later turns out to be marginal.
The cover plate is what stays visible after the floor finish goes down. Jianlai floor springs use SS 201 or SS 304 stainless steel panels, available in four finishes.
Satin — a fine directional grain with low reflectivity. It reads as a soft architectural surface under lobby lighting and does not draw attention to the contact marks that daily use leaves, which is why it turns up on high-traffic commercial entrances.
Polish — a high-reflectivity surface with a bright, crisp appearance. The smooth face wipes down quickly during routine cleaning, and it coordinates with polished pull handles and patch fittings in the same scheme.
Gold — a warm tone used as a deliberate accent. It pairs with bronze or brass door furniture elsewhere in the fit-out, on projects where the floor spring cover is meant to be a visible detail.
Black — a uniform, non-reflective dark surface. It sits quietly against stone, tile or dark metal thresholds, so the door reads as one clear plane.
SS 201 and SS 304 differ in corrosion behaviour, and the project environment decides which one matters. For interior doors in dry, conditioned spaces, either grade does the job. For entrances exposed to weather, poolside locations or coastal sites, raise it with your supplier before the order and have the answer recorded.
Two things are worth confirming on a bulk order. First, that the whole batch comes from one production run, since two runs can differ slightly in tone. Second, that the finish matches the adjacent hardware, meaning pull handles, patch fittings and locks, which are often ordered separately from the floor spring itself. A satin cover plate next to a polished patch fitting reads as a mistake from across a lobby, and it is not the kind of detail anyone notices until the doors are glazed.
For coastal or high-humidity projects, ask how the panel material and the finish hold up in salt-laden air. It is a short question, and it settles more easily before production than after handover.
On larger orders it is worth retaining a physical approved sample before production starts. A sample that stays on site gives the installer, the glazier and the site supervisor one reference for finish and fit, which matters when deliveries arrive over several weeks and the people on site have changed.
A floor spring opens in both directions. That is the operating pattern it is built around, and it shapes how the opening can be used: the door swings either way and returns to centre without a stop.
Speed adjustment is standard on every unit rather than an option to shop for. Jianlai sets closing speed and latching speed before shipment: closing speed governs the main part of the swing, and latching speed governs the final section where the door pulls itself shut. Two screws on the floor spring body control the two speeds, and installers can adjust them on site to suit local practice. The adjustment is made before the cover plate is screwed down, which is the last step of the installation.
What does belong in the order is the function type. Hold open and non hold open versions exist for different scenarios, and which one suits your project depends on how the space is used. Confirm the version on the order line, because getting it wrong after delivery means changing hardware rather than changing a setting.
Dimensions are model-specific. Body size, cement box depth and cover plate footprint all change with the model, so the data sheet for the exact model number is what to work from rather than a general catalogue page.
The cement box is where a dimensional error becomes expensive. It goes into the floor before the finish is laid, and the cover plate has to sit level with the finished floor surface. If the cement box is too shallow for the model, or the slab cannot take the depth, the cover ends up proud of the floor and door alignment suffers. Correcting it means breaking out concrete.
Before ordering, get the dimensional drawing for the model and check it against the floor build-up: slab, screed and finish layer. Confirm three numbers on that drawing, being overall body depth, cement box dimensions and the cover plate footprint. Then hand the drawing to whoever sets the cement boxes, not only to the door installer.
The finished floor level matters as much as the box depth. Tiling, stone or screed laid after the box is set changes where the cover plate ends up, and a cover standing a few millimetres proud of the floor becomes a trip edge at a busy entrance. Agree the finished floor level before the boxes go in, not after.
This is also the point to ask whether a no-digging model suits the project, if excavation is not an option on site.
Four commercial items belong in the written order:
MOQ — 100 pcs per order on Jianlai floor springs
Lead time — around 30 days for regular production
Warranty — 5 years across the floor spring series
OEM / ODM — supported, including custom logo, finishes and packaging
Two of these reward a follow-up question. Ask what the warranty covers in practice, and ask about spare part availability for the model you are ordering. A replacement some years into a project's life is much simpler when the same model is still in production.
Packaging and labelling are worth a line on the order as well, particularly on projects with phased handovers. Cartons marked by model and by door location save sorting time on a site where several hundred doors are being installed across multiple floors.
On longer programmes, ask whether the floor spring order can be split into deliveries matched to the installation schedule. Holding several hundred units on a site that is not ready for them creates storage and handling problems, and door hardware gains nothing from being moved twice.
Jianlai tests every floor spring before it leaves the warehouse, on top of first-piece inspection, in-process patrol inspection and random sampling ahead of final inspection and shipment. The full process is set out on our quality control page.
For a bulk order, ask for the inspection records to travel with the shipment rather than requesting them later. The value is not the paperwork itself. If a question comes up on a batch six months into the project, the inspection record is what shows whether the units were consistent when they left.
What to ask for is specific: the model numbers covered, the items checked on each unit, and the production date range. Three lines on a document, and they turn a later conversation about a batch from a matter of opinion into a matter of record.
At goods-in, two checks take a few minutes and are considerably harder once the units are set in concrete. Confirm the model number on the carton against the order line, and check the cover plate finish against the approved sample. Doing it at the door rather than at the opening is the whole point.
Check | What to confirm | Where it comes from |
Load rating | Rated capacity covers door weight including hardware | Model data sheet |
Door width | Leaf width within the model's limit | Supplier confirmation |
Panel material | SS 201 or SS 304 as specified for the environment | Order line |
Finish | One production run; matches adjacent hardware | Approved sample |
Function type | Hold open or non hold open as the scenario requires | Order line |
Dimensions | Cement box depth suits the floor build-up | Dimensional drawing |
Order terms | MOQ, lead time, warranty, OEM requirements | Purchase order |
QC records | Inspection records supplied with shipment | Supplier |
Keep the completed checklist with the order file. It turns a specification conversation into something the project team can refer back to when the first delivery arrives.
Six specification items, each one a written confirmation rather than a verbal one: load rating against door weight and width, panel material and finish, function type, dimensional fit against the floor, commercial terms, and inspection records. A floor spring bulk order goes wrong at the specification stage, and that is also where it costs less to put right.
Jianlai supplies floor springs with OEM and ODM support, a 5-year warranty and documented inspection on every batch. Send us your door weights and leaf widths, and we will confirm the matching model and quote against your project quantities. Start from the floor spring range or talk to our team.
Door weights, leaf widths, floor build-ups and site conditions vary by project. Confirm the model selection with your supplier and with the project's installation team before placing a bulk order.
