Door Manufacturer in China for Global Projects
| Lock-body category | Typical application | Common door-leaf association |
|---|---|---|
| Small round-bolt lock | Economical metal or security door | Often a 50 mm leaf |
| Large round-bolt lock | Standard steel entrance door | Often a 70 mm leaf |
| Reinforced lock body | Mid- to high-end security door, villa or project door | Selected by door design and duty |
These are practical product-positioning patterns, not mandatory combinations. A buyer should still confirm the actual dimensions, materials and functions.
The same-looking lock may be offered in materially different grades:
Therefore, a specification that says only “stainless lock” is incomplete. Ask whether stainless steel applies to the faceplate, bolts, case, springs and internal mechanism, and request the claimed grade.
For coastal or high-humidity projects, TOF Door generally recommends full 304 stainless-steel hardware, including the internal lock mechanism, rather than upgrading only the visible plate.
Weight can be a useful comparison when two lock bodies have similar designs and materials. A reinforced lock often weighs more because it uses more substantial components. TOF Door therefore includes weighing in incoming inspection.
However, weight is not proof of quality. A heavy lock can still contain unsuitable material, unnecessary ballast, poor tolerances or an inefficient design. Where formal performance matters, look for applicable test data. For example, ANSI/BHMA lock standards evaluate more than weight: the criteria may include cycle, strength, operational, material, finish and dimensional tests. BHMA grades are progressive performance levels, with Grade 1 the highest where the applicable standard uses Grades 1–3. BHMA product grade levels, ANSI/BHMA A156.2 overview
Do not assign a BHMA grade to an untested export-market multipoint lock simply because it looks heavy or similar to a graded product.
“13-point locking” describes an arrangement of locking points around a door. It does not have one universal counting method across all suppliers.
In a typical TOF Door 13-point configuration, the count is:
| Position | Locking elements | Points |
|---|---|---|
| Main lock body | One spring latch | 1 |
| Main lock body | Four round bolts | 4 |
| Lock edge | Two auxiliary locks with two bolts each | 4 |
| Top of leaf | Two shoot bolts | 2 |
| Bottom of leaf | Two shoot bolts | 2 |
| Total | 13 |
The auxiliary locks in this arrangement are on the lock edge. They are not hinge-side security pins. Hinge-side fixed pins exist in some markets and constructions, but are not common on TOF Door’s ordinary steel entrance doors.
If one upper rod operates two distinct bolt heads, this system counts them as two locking points. Another supplier may use a different counting convention. Buyers should therefore request a diagram that identifies every active point instead of relying on the number alone.
TOF Door also supplies an 11-point version. It generally uses the same main and auxiliary locking arrangement, but changes the upper bolts from two to one and the lower bolts from two to one.
The objective is not simply cost reduction. Fewer top and bottom points can reduce operating resistance and make the mechanism smoother while retaining a suitable locking arrangement for ordinary residential use. The final choice should reflect the buyer’s market preference and required performance.
Some armored doors advertise 20 or 24 points. Additional engagement points may improve resistance in a correctly designed system, but the number alone cannot show:
More points also add linkage, driving resistance and repair complexity. For many ordinary residential projects, TOF Door considers a properly matched 11- or 13-point system sufficient.
The safest wording is:
A 13-point locking system describes the locking arrangement. It does not by itself prove a certified burglary-resistance level.
The cylinder is frequently overlooked even though it controls access to the mechanical lock. Common materials in TOF Door orders include solid brass, zinc alloy and aluminum-clad copper for lower-price products. Solid brass is the most common standard option.
Buyers should confirm:
A cylinder selected for a 50 mm door leaf may not fit a 70 or 90 mm leaf. If it is too short, it may be impossible to install or operate correctly. If it projects too far beyond the protective trim, it can create a mechanical vulnerability and an unattractive finish.
For many residential entrance doors, TOF Door supplies two construction keys and five owner keys. The construction keys are used during installation. After an owner key is used as designed, the construction keys no longer operate the cylinder.
This arrangement is common for ordinary entrance doors in TOF Door’s export business, but it should not be assumed for interior doors, fire doors or every market. The quotation should state the key arrangement explicitly.
During inspection, TOF Door checks key insertion, rotation, repeated operation and the construction-key invalidation function where applicable.
Handle material may include iron, zinc alloy, stainless steel or aluminum alloy. According to TOF Door’s regular sourcing experience, the usual cost sequence is iron, zinc alloy, stainless steel and then aluminum. This order is not universal: design, process, thickness, finish and supplier can change it.
Low-cost handles often save money by reducing the backing thickness, changing the base material or simplifying the finish. A useful inspection should cover:
The square spindle linking the handles is selected primarily according to finished door-leaf thickness. The connecting screws must also match.
The spindle is one of the components most likely to be supplied too short when hardware and door thickness are ordered separately. TOF Door therefore trial-fits the handle assembly before shipment.
Many Chinese-market security doors use a fixed exterior handle and an active interior handle. International projects often request active handles on both sides. Large fixed exterior pull handles are also increasingly used on modern entrance doors.
The handle function affects the lock body, spindle and user behavior. It must be stated on the hardware schedule rather than inferred from a product photo.
Hinges carry the complete door leaf and keep the lock points aligned. They should be selected using the finished leaf weight, height and width, duty cycle, leaf thickness, opening angle, security or fire requirements and reinforcement design.
| Door leaf | Experience-based starting configuration |
|---|---|
| 50 mm | Often three three-hole hinges; some doors use four |
| 70 mm | Often four five-hole hinges |
| 90 mm | Often four reinforced five-hole hinges or an alternative high-capacity system |
These are common factory configurations, not engineering rules. A large leaf, unequal double door, double-leaf door or unusually heavy core must be reassessed.
The number of hinges and screw holes does not establish load capacity. Hinge dimensions, leaf thickness, pin diameter, bearing design, steel grade, fasteners and reinforcement all matter.
Common TOF Door options include chrome-plated iron, zinc-plated iron, stainless steel, fluorocarbon-coated iron, powder-coated or antique-copper finishes. A five-hole chrome-plated concealed hinge is widely used in the company’s regular entrance-door production.
Adding more hinges does not automatically correct a weak system. The leaf and frame reinforcement, screw engagement, installation geometry and hinge alignment must also be correct.
Smart-lock demand is growing, especially in mid- to high-end retail and project orders. Fingerprint, PIN and card access are the most commonly requested functions. TOF Door requires a mechanical key override because electronic functions can fail, batteries can discharge and users still need an emergency path.
Connectivity is model-specific. Bluetooth, Wi-Fi, Tuya-based systems and other platforms should not be treated as interchangeable. Buyers should confirm that the selected app, region, language, account system and network functions are available for the actual model.
According to TOF Door’s practical evaluation, false wake-ups or recognition problems can occur on many face-recognition locks outside the highest product levels. It is therefore unwise to specify “face recognition” as a checkbox without testing the actual device.
Face recognition should be selected only when the detection performance, standby consumption and user experience have been verified on the actual lock model.
A smart lock advertised for exterior use should protect the exterior panel, lock, wiring, connectors, ports and battery compartment. Do not infer an IP rating unless the specific model has evidence for that rating.
Even when a product is intended for an exterior door, TOF Door recommends an entrance canopy or other protection from continuous direct rain because the product contains electronics.
Smart locks may use replaceable dry cells or rechargeable lithium batteries. Confirm the battery type, capacity, replacement method and whether batteries are included in the export shipment.
Battery-powered products require shipping planning. IATA states that air carriage requirements vary by battery configuration and energy rating, and provides specific guidance on identification, packing, marking, labeling and documentation. IATA battery transport guidance
Emergency operation normally follows this sequence:
The emergency connector may be USB-C, Micro-USB or another design. It must be confirmed from the actual model.
A smart lock must match:
Some smart-lock models require a compatible lift-to-lock and press-to-unlock mechanical lock body. The function may be available from both the interior and exterior handles, depending on the lock configuration.
An oversized smart-lock panel normally causes no conflict if it is included during door design. Retrofitting after production is more difficult, especially on deeply embossed surfaces. Early lock-model confirmation allows the door pattern and mounting zone to be designed together.
TOF Door’s smart-lock inspection covers the specified fingerprint, PIN, card, key, motor and bolt functions; emergency power; low-battery behavior; mobile functions where ordered; and repeated operating cycles.
The hardware schedule must be completed before the door and frame are machined. At minimum, the supplier should confirm:
Locks and handles are often handed, although reversible products exist. Reversal may require installer adjustment, so the supplier should provide clear guidance.
The frame must be prepared for the selected lock. Different lock bodies and rod systems require different hole patterns. Even small deviations can make an otherwise good lock feel rough.
Common causes of binding after installation include:
Diagnosis should start by identifying whether the mechanism operates smoothly while the door is open. If it does, alignment or installation is more likely than an internal lock defect.
Hardware substitutions require special care on fire-rated or otherwise certified doors. A tested door is not an unlimited platform on which any lock, hinge, closer or smart lock can be installed.
UL explains that fire-door hardware categories include locks, latches, hinges, electric strikes, bolts, viewers, exit hardware, closers and accessories. Installation must follow the relevant standards and manufacturer instructions. UL also distinguishes fire-exit hardware for rated assemblies from panic hardware intended only for non-rated exit doors. UL Doors, Windows and Related Hardware Application Guide
Therefore:
Fire-door locking logic often prioritizes reliable latching, closing and egress rather than maximizing the number of security bolts. Whether a closer is required depends on the applicable code, opening, approved drawing and certified assembly—not supplier preference.
If hardware is changed outside the certified construction, the supplier must reassess the product status. Unless the replacement is accepted within the certification scope, the door should not be represented or labeled as the same certified fire-door assembly.
UL notes that a labeled product modified in the field may require evaluation to determine whether it still complies. It also explains that certification markings indicate evaluation to an applicable standard and that certified production is subject to periodic factory auditing. UL certification and field evaluation guidance
If a door uses fire-resistant materials but has no required certification, describe it accurately—for example, “fire-resistant steel door,” “steel door with fire-resistant materials,” or “non-certified fire-door configuration.” It must not be presented as a certified fire-rated door where a code, approval or label is required.
Inspection should address both components and the assembled door.
Weight is most useful when comparing repeat batches of the same approved item. It is not an international performance rating.
TOF Door generally evaluates the operation of the complete door rather than measuring the engagement depth of every individual locking point. Multi-stage sampling is carried out during production, and project hardware is identified by door or floor number where required.
The phrase “complete hardware” is still too vague for a purchase order. A component list should identify exactly what is supplied and what is factory-installed.
In a typical TOF Door shipment:
The packing list should account for every component. Common missing-item risks include keys, spindles, connecting screws, small covers and installation accessories.
Distributors and projects should hold spare components because incorrect use, installation damage and long-term wear can occur. The exterior handle is particularly vulnerable when users apply force incorrectly or when the selected quality is too low for the traffic level.
TOF Door normally offers free spare hardware at approximately 1%–3%, adjusted according to the order. Depending on the agreed order, spares can cover complete lock sets, handles, cylinders, keys, spindles, screws and weather strips. The exact percentage and component list must be written into the quotation or contract; it should not be assumed that every order receives 3% of every item.
Two handles or locks may look almost identical while using different materials, internal components, thicknesses and finishes. Ask for the material scope, weight reference, operating sample and test evidence where required.
The number describes the locking arrangement. It does not verify the lock, frame, cylinder, door construction or installation.
Cylinders, spindles, screws and smart-lock panels must fit the leaf thickness and preparation. “One standard lock” is not enough information.
A strong lock cannot compensate for a sagging door leaf. Once alignment is lost, multiple bolts can become harder—not easier—to operate.
Extra functions increase electronic complexity, power demand, setup requirements and after-sales work. TOF Door has seen buyers change from face recognition or extensive remote networking to a simpler, more stable function set.
A lock or hinge substitution can move a fire-door assembly outside its approved construction. Confirm the certification scope before ordering or modifying hardware.
Use the following checklist instead of comparing a single line labeled “lock set.”
| Category | Information to compare |
|---|---|
| Lock body | Model, bolt diagram, material scope, weight reference, operating mode, test/grade evidence |
| Multipoint system | Actual point diagram, auxiliary locks, top/bottom rods, operating force |
| Cylinder | Material, length, center, key system, thumbturn/double-key function, protector |
| Handle | Material, finish, weight reference, fixed/active function, spring and mounting system |
| Connecting parts | Spindle length, screw length, rod dimensions |
| Hinges | Type, material, size, thickness, pin/bearing design, quantity, load basis, reinforcement |
| Smart lock | Functions, app/region, battery, emergency power, key override, dimensions, environment |
| Frame and leaf | Hardware boxes, strike positions, machining, handing and tolerances |
| Certification | Applicable standard, listed components, label and permitted preparation |
| Quality control | Incoming checks, trial installation, functional testing and approved sample |
| Supply and service | Installed/loose components, labels, instructions, spares and replacement support |
When the budget is limited, protect basic reliability first: smooth operation, compatible dimensions, suitable hinges, a dependable cylinder and correct frame alignment are more important than decorative complexity or an inflated locking-point count.
| Application | Practical hardware priority |
|---|---|
| Economical residential metal door | Simple reliable mechanical lock, suitable cylinder, basic durable handle and hinges matched to leaf weight |
| Standard apartment entrance | Smooth large-bolt or comparable lock, protected solid-brass cylinder, appropriately graded handle and multipoint system if required by market |
| Villa or premium residence | Reinforced mechanical system or verified smart lock, improved cylinder protection, stronger hinges and coordinated door/frame reinforcement |
| Coastal or humid location | Full 304 stainless-steel lock construction where specified, corrosion-resistant handle and hinges, protected finishes and careful environmental detailing |
| High-traffic project | Proven cycle durability, serviceable components, load-rated hinges, clear spare-parts plan and installation control |
| Smart entrance door | Stable essential functions, mechanical override, emergency power, model-specific machining and protected electronic components |
| Certified fire door | Only hardware permitted by the approved/certified assembly and applicable egress requirements |
These are selection priorities, not universal specifications. Final hardware must follow the project’s door size, use, market regulations, certification and approved drawings.
Steel-door hardware should be specified as a coordinated system. A good purchase order does not stop at “13-point lock,” “304 stainless,” “smart lock” or “four hinges.” It defines the exact lock body, material scope, cylinder, key arrangement, handle function, spindle, screws, hinge capacity, door handing, frame preparation, testing, packaging and spare parts.
The most useful single rule is:
Door hardware must be evaluated together with the door leaf, frame, reinforcement and installation.
When performance is claimed, ask for the appropriate evidence. When certification is required, stay within its permitted construction. And when two quotations look similar, compare the complete hardware system—not the headline number.
No. The additional points may add engagement, but actual performance also depends on the bolt design, cylinder, lock case, frame, reinforcement, door leaf and installation. The number is not a certified security rating.
In one common TOF Door arrangement, they are one spring latch, four main bolts, four auxiliary-lock bolts, two top bolts and two bottom bolts. Other suppliers may count differently, so request a diagram.
No. Weight is useful for comparing repeat batches of a similar design, but it does not prove material quality, durability or resistance. Applicable test results are more reliable.
Not necessarily. It may describe only the faceplate. Specify whether the case, bolts, springs and internal mechanism are stainless and identify the requested grade. TOF Door can supply full 304 stainless construction, including internal components.
It normally means two construction keys and five owner keys. Once the owner-key change function is activated as designed, the construction keys no longer work.
If they are too short, the lock trim may not install or operate. If the cylinder is too long, it can protrude beyond the protector. A long spindle can often be cut, but should still be specified correctly.
TOF Door often uses four five-hole hinges on a regular 70 mm entrance door, but hinge selection must be based on the actual leaf weight, size, duty, hinge capacity and reinforcement. The hole count alone is not a load rating.
TOF Door recommends and requires a mechanical override in its smart-lock principle. It provides emergency access if the electronics or battery system fails.
No. The panel dimensions, backset, center distance, lock case, spindle, screws, holes, rods, door thickness and handing must all be compatible. Retrofitting is especially difficult on deep embossed surfaces.
Only when the exact hardware and preparation are accepted within the applicable certified assembly and code requirements. An unconfirmed substitution can invalidate the claimed assembly status.
Common causes include an out-of-square frame, leaf sag, hinge misalignment, incorrect strike holes, grout deformation, wrong rod length or an internal lock fault. Test the mechanism with the door open to help separate lock problems from alignment problems.
Keep critical service items such as lock sets, handles, cylinders, keys, spindles, screws and weather strips. TOF Door’s regular free-spare allowance is approximately 1%–3%, depending on the order and agreed component list.
