Floor Spring & Patch Fitting Buyer's Guide 2026

How Importers, Distributors and Glass Door Contractors Specify Door Control Hardware That Passes Inspection

 

Floor Spring and Patch Fitting Sourcing Guide 2026: Specifying Glass Door Hardware for Commercial Projects

A floor spring and a patch fitting are the two cheapest parts of a glass door assembly and the two that generate the most site complaints. Buying them badly does not fail at the factory gate - it fails eight months later, on a project in another country, when a 120 kg glass leaf stops closing smoothly or a patch fitting starts to weep oil onto a stone floor. For importers and distributors, that failure is not a warranty cost; it is a lost account.

This guide is written for the trade buyers who have to get it right the first time: glass door hardware importers, architectural hardware distributors, contract glaziers, and procurement teams specifying for hotels, shopping centres, hospitals and office fit-outs. It covers the five numbers that determine a floor spring model, how patch fitting types map onto a tempered glass door assembly, which certifications actually matter in each export market, and how wholesale floor spring and patch fitting supply is structured when you buy in containers rather than units.

Everything here reflects specifications HEINDA manufactures and exports today, with model numbers and load limits you can put straight into a tender document.

 

1. Why Floor Springs and Patch Fittings Fail on Site

Most complaints trace back to a specification decision made at quotation stage, not to a manufacturing defect. Five mistakes account for the majority of them.

● Load limit chosen from the catalogue headline instead of the door. A floor spring rated 150 kg is rated for a 150 kg door used at normal frequency. Heavy traffic, high wind loading, or a door leaf with an unusually wide stile all erode that margin. The default should be one size up from the calculated load.

● Door width ignored. A floor spring is a lever: the wider the leaf, the more torque it has to absorb at the spindle. Max door weight and max door width are a paired constraint, and a model that is safe at 150 kg x 900 mm is not automatically safe at 150 kg x 1,400 mm.

● Patch fitting thickness mismatch. Standard stainless steel patch fittings are made for 8 to 12 mm tempered glass. Heavy-duty big L patch fittings exist because 15 mm glass needs a completely different clamp geometry. Fitting a 12 mm patch fitting to 15 mm glass, or shimming it to fit, is a structural shortcut that shows up as glass edge cracking.

● Floor spring and patch fitting sourced independently. The top patch, bottom patch and floor spring form a load path. If the floor spring spindle height, the bottom patch socket depth and the top pivot do not match within tolerance, the door will sag, drag, or refuse to hold its position at 90 degrees.

● No test data in the file. When a consultant or a fire authority asks for cycle test evidence, a supplier who can only offer a product photograph loses the project. This is why certified hardware is worth a price premium in tender-driven markets.

All five are avoidable at the quotation stage, which is where a manufacturer who understands glass door assemblies is worth more than a trading company that only forwards prices.

 

2. Floor Spring Selection: The Five Numbers That Decide the Model

Every floor spring quotation should carry five numbers. Ask for all five and most of the ambiguity disappears.

1. Maximum door weight (kg). The static mass the closer can control through a full opening cycle.
2. Maximum door width (mm). The leaf width at which the rated load still applies.
3. Closing force class (EN). EN 1 to EN 7 for controlled closing devices; EN 7 is the top of the range for very large or very heavy doors.
4. Opening angle and hold-open. Whether the door can be held at 90 degrees or at a selected intermediate angle.
5. Cycle durability and test standard. For export projects this is usually ANSI/BHMA A156.4 Grade 1, EN 1154, or both.

The table below maps the HEINDA floor spring range against those five dimensions so that a distributor can quote from a single page.

Model	Max door weight	Max door width	Type / function	Typical application
HD-75	60-150 kg	600-1,100 mm	Single cylinder floor spring	Commercial entrance doors, shopfronts
TS-80	up to 320 kg	1,400 mm	Heavy-duty floor spring, CE	Hotel lobbies, airport and mall entrances
1000 kg Floor Door Hinge	up to 1,000 kg	Project specific	EN 7 closing force, efficient closing	Oversized architectural doors
1500 kg Heavy-duty Floor Spring	up to 1,500 kg	Project specific	Super heavy-duty floor spring	Monumental doors, vault and museum doors
Concealed Floor Spring for Wooden Door	up to 120 kg	1,000 mm	Concealed, one-way opening	Premium interior timber doors
Concealed Automatic Door Opener	up to 120 kg	Project specific	Motorised concealed unit	Design-led entrances with no visible hardware
Swing Automatic Door (electric floor spring)	up to 450 kg	2,000 mm	Worm gear helical drive	Heavy automatic swing entrance doors

Two rules of thumb that save distributors argument on site. First, for doors over 1,100 mm wide, move to a heavy duty floor spring even if the leaf weight alone suggests a mid-range model. Second, for anything above 320 kg, insist on a factory load calculation against the actual leaf geometry rather than a catalogue figure - oversize doors are engineered units, not catalogue picks.

 

3. Patch Fitting Specification for Tempered Glass Doors

Patch fittings are the visible hardware of an all-glass door: they clamp the glass, carry the pivot, hold the lock and, in larger assemblies, take the overpanel. A complete assembly normally combines a bottom patch, a top patch, an optional big L patch or overpanel patch, and a lock patch. Because the two share one load path, a floor spring manufacturer that also produces the glass door patch fitting set can guarantee that interface, which is why the two are normally specified and ordered together. In practice two specifications cover most projects: a 304 stainless steel patch fitting for 8-12 mm glass, and the heavy-duty TP-S40 big L version for 15 mm glass.

The single most important compatibility variable is glass thickness. Standard stainless steel patch fittings are engineered for 8-12 mm tempered glass. Heavy-duty big L patch fittings are engineered for 15 mm glass. Glass thickness also determines the maximum leaf size and therefore the floor spring class, so the two decisions cannot be made separately.

Patch fitting type	Model	Glass thickness	Function in the assembly
Bottom patch	TP10	8-12 mm	Carries the floor spring spindle; the primary load transfer point
Top patch	TP20	8-12 mm	Top pivot; guides the leaf and absorbs lateral force
Overpanel patch	TP30	8-12 mm	Secures the fixed overpanel above the door
Big L patch	TP40	8-12 mm	L-shaped clamp for full-height glass doors
Heavy-duty big L patch	TP-S40	15 mm	High-mass full-height glass doors
Lock patch	US10	8-12 mm	Houses the locking cylinder and floor bolt
Hydraulic patch fitting	HPF-80	80 kg / 950 mm leaf	Combined hydraulic closer and patch in one housing
Hydraulic patch fitting	HPF-100	100 kg / 1,100 mm leaf	Combined unit with 304 stainless steel cover plate

For hydraulic patch fittings - the models that integrate a floor-spring mechanism into the patch itself - the specification questions are different. Surface-mounted versions are specified where cutting the floor is impossible: retrofit projects, raised floors, listed buildings, and tenant fit-outs where the landlord will not allow coring. No-digging patch fitting floor springs solve the same problem. The trade-off is that the closer mechanism is visible and must be adjusted and serviced from above, so the closing-speed adjustment range becomes a serviceability question, not just a performance question.

Material grade is the second lever on price and life. 304 stainless steel is the default for interior and general commercial use; the visible surface finish (satin, mirror, PVD) is a catalogue choice. Buyers quoting coastal projects or wet-area applications should confirm the grade in writing rather than assume it.

 

4. Matching Floor Springs with Patch Fittings

A glass door assembly is a system, and system-level sourcing is where the warranty argument is won or lost. When a floor spring and its patch fittings come from one flow-line, spindle geometry, socket depth and pivot alignment are already matched - and there is one party to call when something drags.

Practical checks before you release a purchase order:

● Confirm the floor spring spindle diameter and the bottom patch socket are from the same specification family.

● Confirm the top pivot height range covers the actual door height after floor build-up.

● Confirm the finished floor level and the depth of floor recess available for the floor spring box.

● Confirm the closing speed and latching speed adjustment is accessible after installation, without removing the door leaf.

● Confirm the door leaf weight and width both sit inside the paired limits of the selected floor spring.

 

5. Certification: What to Ask For Before You Import

Certification is the difference between selling into a professional specification and selling into a price-only channel. For door control hardware the documents that matter are these:

Standard / certification	What it covers	Why the buyer needs it
ANSI/BHMA A156.4 Grade 1	Door closers and floor closers; Grade 1 requires 2,000,000 test cycles	US and Canadian projects; specified by architects on commercial work
UL 228 & UL 10C	Door closer hardware, plus 3-hour fire door assembly testing	Fire door assemblies; required for rated openings
EN 1154 / CE	Controlled door closing devices in the EU; 500,000 cycles	EU and UK specification, CE marking obligations
CCC (fire rated door closer)	China Compulsory Certification for fire rated products	Chinese fire-rated projects
ISO 9001 / ISO 14001 / OHSAS 18000	Quality, environmental and safety management systems	Supplier qualification and factory audit
CNAS-accredited laboratory	In-house component testing under accredited scope	Evidence that testing is in-house, not outsourced

HEINDA is certified to ISO 9001, ISO 14001 and OHSAS 18000, holds CE certification for its product range, and its door closer families are tested to ANSI/BHMA A156.4 Grade 1 with a 2,000,000-cycle life test, together with UL 228 and UL 10C three-hour fire testing. The testing centre is CNAS-accredited, which matters commercially: it means cycle evidence and component inspection data can be produced on demand instead of being promised for the next shipment.

Ask for the certificate number and the issuing laboratory before you sign, and keep the file with the product specification. Distributors who hold that file win tender work; those who hold only a price list do not.

 

6. Wholesale, OEM and Private Label: How the Trade Buys

Floor springs and patch fittings are container products with a low unit price and a high cost of failure, so the commercial model matters as much as the technical one. A single bulk order can carry a distributor for a season, and a single specification error can cost it a season. There are three common ways trade buyers purchase.

Model	What the buyer gets	Best for
Wholesale floor spring supply	Standard HEINDA models, own labels on request, mixed containers across the range	Distributors building a stock range across price points
OEM / ODM manufacturing	Manufacture to your drawings, finishes, spindle geometry and packaging	Brands and importers with their own specification
Private label (own brand)	Your brand on the product, the carton and the instruction sheet	Distributors with an established trade name
Project supply	Model-specific quantities against a tender schedule, with test documentation	Contractors and project procurement teams

When you compare quotations from a wholesale floor spring supplier, compare these five lines, not just the unit price: (1) whether the price includes the matched patch fitting set; (2) the packaging standard used for sea freight; (3) whether spare parts - spindles, oil seals, adjustment screws, patch fitting clamp plates - are held in stock; (4) the MOQ per model and whether mixed models are allowed in one container; (5) the documentation package. Items 4 and 5 decide whether a container quotation is actually usable, because a distributor rarely needs a full container of one model.

A supplier for importers should be able to answer all five in writing before the first order. If the answers arrive as verbal assurances, the quotation is not yet a quotation.

 

7. One-Stop Door Control Sourcing: The Full Range

The reason many HEINDA distributors consolidate here is that a glass door assembly and an entrance project never need only two parts. A single project schedule may call for a floor spring and patch fitting set on the glass entrance, a door closer on the timber fire doors behind it, an automatic sliding door for the retail frontage, an automatic swing door for the accessible route, and an automatic window system for the naturally ventilated facade above.

Sourcing those five groups from separate factories means five sets of tolerances, five lead times, five documents packages and five conversations when something is wrong. HEINDA manufactures the whole chain:

● Floor spring - single cylinder, heavy-duty (up to 320 kg) and super heavy-duty (up to 1,000 kg and 1,500 kg) models, plus concealed floor springs for timber doors.

● Door closer - overhead, concealed, fire-rated and power-adjustable units, including UL Listed overhead door closers and EN1-EN6 adjustable models.

● Patch fitting - stainless steel patch fittings in 8-12 mm and 15 mm glass versions, hydraulic patch fittings, no-digging patch fitting floor springs and lock patches.

● Automatic swing door - concealed and overhead swing door operators from 60 kg up to 300 kg gate units, with adjustable opening and closing speed.

● Automatic sliding door - sliding door operators for single and double leaves, telescopic, maglev and emergency evacuation models, with hidden or surface ground track.

● Automatic window system - chain, screw and push-rod window openers with overload protection and multi-window linkage for natural and smoke ventilation.

For a distributor this converts five purchase orders into one, with one set of container loading calculations and one documentation package. For a contractor it means the interface between the glass door and the door closer behind it is no longer an argument between two suppliers.

 

8. Quality Control, Packaging and Lead Times

Two production facts decide whether a wholesale floor spring order ships cleanly.

The first is production chain depth. HEINDA runs more than 30 years of hardware deep-processing experience with hundreds of CNC machines and a complete production chain from casting and machining through to assembly and testing, which is why a floor spring and its matched patch fittings can be produced on the same tolerances. The second is inspection. Every component passes through a national-certification testing laboratory before assembly, and finished assemblies are cycle-tested rather than spot-checked.

On the commercial side: HEINDA operates a service network of more than 3,000 points with 365-day, 24-hour pre-sale and after-sale support, and its major manufacturing centre is located roughly 50 minutes from Shanghai Hongqiao Airport, which keeps sampling and pre-shipment inspection practical for overseas buyers. Annual capacity exceeds 4,000,000 sets of floor springs, 1,000,000 sets of door closers and 20,000 sets of automatic door systems - capacity that matters when a distributor lands a framework agreement and needs repeat shipments at a fixed specification.

 

9. Frequently Asked Questions

What is the difference between a floor spring and a hydraulic patch fitting?

A floor spring is recessed into the floor and carries the door through a spindle; the closer mechanism is concealed below the floor. A hydraulic patch fitting integrates the closing mechanism into the hardware clamped to the glass itself, so no floor excavation is needed. Floor springs suit new-build projects with a floor recess; hydraulic patch fittings suit retrofits, raised floors and buildings where coring the floor is not permitted.

Can one floor spring model cover several door weights?

Yes, within a stated range - for example the HD-75 covers 60-150 kg and 600-1,100 mm. The correct practice is to specify the model whose range covers both the heaviest and the widest leaf on the project, and to step up one size where traffic is heavy or the entrance is exposed to wind.

What glass thickness do standard patch fittings accept?

Standard stainless steel patch fittings accept 8-12 mm tempered glass. For 15 mm glass, a heavy-duty big L patch fitting such as the TP-S40 is required, because the clamp geometry and bolting are engineered for the thicker laminate.

Which certifications should a floor spring supplier provide for European projects?

CE marking with testing to EN 1154 for controlled closing devices is the baseline. For fire door applications the assembly also needs fire test evidence. For North American projects the equivalent baseline is ANSI/BHMA A156.4 with UL 228 and UL 10C where the opening is rated.

Do you supply wholesale floor springs and patch fittings under our own brand?

Yes. HEINDA supplies wholesale, OEM and private label orders. Buyers can specify model mix, finishes, spindle geometry, packaging and branding. Minimum order quantities are per model, and mixed models can be combined in one container.

How do we avoid sagging glass doors on a multi-floor project?

Source the floor spring and the patch fitting set as one matched system, confirm spindle and socket geometry against the actual glass thickness, and verify the top pivot height range against the finished floor level. On projects with heavy or oversize leaves, request a factory load calculation rather than relying on catalogue limits.

 

10. About HEINDA

HEINDA is the brand of Anhui Haida Door Control Equipment Co., Ltd., a door control manufacturer established in 1987 and based in Xuancheng, Anhui Province, China. The company has focused exclusively on door control for more than 35 years, operates an 80,000 square metre manufacturing base with around 900 employees, and exports to more than 70 countries and regions across Europe, North America, South America, Southeast Asia and the Middle East.

Its product range covers floor springs, door closers, patch fittings, automatic swing door systems, automatic sliding door systems and automatic window systems. It holds ISO 9001, ISO 14001 and OHSAS 18000 management system certifications, CE certification on its product range, ANSI/BHMA A156.4 Grade 1 test results with 2,000,000 cycles, and UL 228 and UL 10C three-hour fire testing. HEINDA was recognised as a National High-tech Enterprise and named a National Floor Spring and Automatic Door Opener Production Demonstration Base; it has cooperated with Tongji University on door control research and development since 2011 and holds multiple national invention patents, including China's first electric floor spring.

 

11. Key Takeaways

● Specify floor springs by five numbers: max door weight, max door width, closing force class, opening angle, and cycle test standard.

● Standard stainless steel patch fittings fit 8-12 mm glass; 15 mm glass requires heavy-duty big L patch fittings.

● Source the floor spring and patch fitting set as a matched system - spindle and socket geometry decide whether the door works.

● Ask for certificate numbers and issuing laboratories, not for product brochures.

● Compare wholesale quotations on packaging, spares availability, MOQ flexibility and documentation, not unit price alone.

● Consolidating floor spring, door closer, patch fitting, automatic swing door, automatic sliding door and automatic window system supply with one manufacturer removes interface risk across the whole project schedule.

 

Ready to specify? Send us your door schedule - leaf weight, leaf width, glass thickness and application - and we will return a matched floor spring and patch fitting specification with cycle test documentation. Email: martin@hkhaida.com | Mobile / WhatsApp: +86 188 5728 8288 Anhui Haida Door Control Equipment Co., Ltd. - Cross Economic Development Zone, Langxi County, Xuancheng City, Anhui Province, 242100, China Website: www.heinda-cn.com