A cabinet hardware selection manual is usually written as a catalogue with an index: hinges in one section, runners in another, connectors in a third, and a specification table at the back. It is comprehensive, it is well organised, and it fails at the job its title claims, because it presents the parts as a list of independent choices when the thing that decides whether a cabinet works is the order in which the choices are locked.
Hardware families constrain each other through shared geometry. A hinge's cup bore and plate fixing set the door's drilling pattern; the door overlay sets how far the hinge must reach; the runner system sets the cabinet's internal depth; the carcass joint sets the drilling standard everything else is positioned from. Changing any one of them after the others are frozen means redesigning, re-drilling, or re-tooling a group. The cost of a change is therefore not a property of the change — it is a property of when the change happens.
This is the manual written the other way round: as a freeze order. It sets out the eight decisions and their dependency chain, the interface schedule that assigns ownership of each shared dimension, a change classification that prices a late revision by what it forces, the second-source qualification rules per family, and the documentation and approval gates a real selection process needs. It draws on 15 years of manufacturing cabinet hardware for furniture producers across 40+ countries.
Cabinet hardware and connecting fittings range
Why the Order Matters More Than the Choice
| Stage when the change is made | What it forces | Typical cost of the change |
| Before the drawing is issued | Nothing | Documentation only |
| After the drawing, before the sample | A new drawing and re-approval | Days |
| After the first sample is built | New sample, re-approval, possible panel re-cut | Days to weeks |
| After tooling or a CNC program is released | New or modified tooling, new program | Weeks, plus tooling cost |
| After the first production batch | Stock write-off, rework, possible recall | Weeks to months, plus scrap |
| After the product is in the field | Field service, replacement parts, claim handling | Open-ended |
The single most useful number in this table is the ratio between the first row and the last. A decision made on paper is nearly free; the same decision made after production is not. Everything else in a selection manual exists to move decisions to the left-hand end of that table.
Two consequences that drive the whole document.
Interface decisions must be frozen before family decisions. The dimensions shared between two hardware families — the door overlay, the bore pitch, the runner's cabinet-side fixing position — belong to no single family. If each family is selected independently, the interfaces are discovered rather than decided, and they are discovered at the sample stage.
A change must be classified before it is approved. The instinct when a customer asks for a different hinge nine months into production is to treat it as a like-for-like substitution. It rarely is. The classification in this guide exists so that the question "what does this cost?" has an answer before the change is accepted.
The Eight Decisions and Their Dependencies
| # | Decision | What it constrains downstream | Frozen by |
| 1 | Door type and overlay | Hinge type, cup bore position, plate fixing pattern | The drawing |
| 2 | Drawer system | Cabinet internal depth, side clearance, runner fixing position | The drawing |
| 3 | Carcass joint system | Drilling standard, panel thickness, assembly sequence | The drawing |
| 4 | The drilling standard (System 32 or equivalent) | Every bore position in the cabinet | The CNC program |
| 5 | Shelf support system | Shelf bore diameter and pitch, load per support | The CNC program |
| 6 | Base system: legs, plinth, or feet | Plinth geometry, adjustment range, floor interface | The drawing |
| 7 | Wall-attachment system | Panel reinforcement, fixing positions, load path to the wall | The drawing and the site survey |
| 8 | Environment and corrosion class | Every finish in the schedule | The specification |
Decision 1 and decision 2 carry the most weight, because between them they fix the cabinet's internal geometry: the door overlay sets the hinge's reach, the hinge's cup bore sets the door's drilling pattern, and the drawer system sets the internal depth that remains. A change to either after the drawing is issued propagates through several other decisions at once.
Decision 4 is the one that is usually not made at all. The 32mm system — 5mm bores on a 32mm vertical pitch, positioned a fixed distance from the panel's front edge — is so widely adopted that it behaves as a default rather than a decision. It is nevertheless a decision, it is the one that every subsequent bore position is measured from, and a supplier whose equipment assumes a different reference will produce panels that fit nothing else. Write it down.
Decision 8 is the only one that is not geometry. It is listed last because it is usually settled last, and it should not be: the corrosion class rules out materials and finishes, and a finish change after the tooling is released is a coating-line change with its own lead time.
Carcass joint systems and the drilling they assume
The Interface Schedule
The interface schedule is the part of the manual that most selection processes lack. It lists every dimension shared between two hardware families and assigns a single owner to each, so that the value is decided rather than inherited.
| Interface | Shared dimension | Owner | Must be frozen by |
| Hinge ↔ door | Cup bore diameter, depth, and centre distance from the door edge | Hinge system | Drawing release |
| Hinge ↔ carcass | Plate fixing pattern and its distance from the panel front edge | Hinge system, subject to the drilling standard | CNC program release |
| Runner ↔ carcass | Cabinet-side fixing positions and internal depth | Runner system | CNC program release |
| Runner ↔ drawer box | Box bottom thickness and side clearance | Runner system | Sample approval |
| Connector ↔ panel | Bore diameter and pitch | Drilling standard | CNC program release |
| Shelf support ↔ panel | Bore diameter and vertical pitch | Drilling standard | CNC program release |
| Door ↔ adjacent door | Overlay, and therefore the gap between doors | Door type decision | Drawing release |
| Leg ↔ carcass | Plate pattern and edge distance | Base system | Drawing release |
| Cabinet ↔ wall | Fixing position, panel reinforcement, and load path | Wall-attachment system | Site survey and drawing |
| Finish ↔ environment | Coating class and salt spray hours | Specification | Specification release |
Why a schedule beats a note on each drawing. A dimension that appears on two drawings will eventually be changed on one of them. The schedule makes the shared dimension visible as a single item with a single owner, so a change to it is recognised as a change to the interface rather than as an edit to one family's documentation.
The top three rows are where the money is. Hinge-to-door, hinge-to-carcass, and runner-to-carcass are the interfaces that generate the most late changes in cabinet production, because they are the ones most often left implicit. All three are governed by the drilling standard, which is why decision 4 above is worth writing down explicitly.
Classifying a Change
Every requested change should be classified before it is accepted. The classification is by what the change forces, not by how large it appears.
| Class | What the change forces | Examples | Approval |
| A — Free | Nothing but a document revision | A colour name, an order quantity, a packaging label | Handled by the account owner |
| B — Adjustment | A new drawing and a new approval, but no new tooling | A different hinge from the same system; a longer shelf support in the same bore | Engineering sign-off |
| C — Re-program | A new CNC program, and possibly a re-cut panel | A different drilling standard; a different cup bore; a runner from a different system | Engineering plus production sign-off |
| D — Re-tool | New or modified tooling, a new sample, and re-approval | A different plate pattern; a different connector body; a new leg form | Commercial approval, with cost and lead time quoted |
| E — Re-certify | Re-testing against a standard | A coating change in a rated application; a load-bearing part in a certified assembly | Compliance approval |
Two rules make the classification work.
A class D or E change is a project, not an amendment. It has a lead time, a cost, and a sample cycle, and treating it as an amendment is how schedules slip. Quoting it as a project — with the tooling lead time attached — is more useful to the customer than an immediate yes.
Class C is the class that is most often misread as B. A change that alters a bore position looks like a simple swap on a specification sheet, and it requires a new CNC program and possibly new panels. Any change that moves a bore, a pitch, or a fixing pattern is class C at minimum.
Second-Source Qualification, Family by Family
A selection manual that names one approved part per item is a manual with a single point of failure. Second-sourcing is part of the selection, and it has to be done per family, because what "equivalent" means differs.
| Family | What must be qualified beyond the drawing | The trap |
| Hinges | Cup bore, plate pattern, and cycle performance to EN 15570 | Matching a drawing while using a different spring rate; the door behaves differently |
| Runners | Load and cycle performance to EN 15338, plus the cabinet-side and box-side fixing positions | Matching the fixing positions while using a different extension mechanism |
| Connectors | Bore diameter, pitch, and take-up range | Matching the bore while using a weaker body material |
| Screws and fixings | Thread form, core diameter, hardness, and coating class | Matching the head and length while using a different thread form |
| Shelf supports | Bore diameter, pin diameter, and load per support | Matching the bore while using a lower-rated pin |
| Legs and levellers | Plate pattern, thread form, load per foot at the stated extension | Matching the plate while using a softer stem |
| Wall attachments | Load capacity per the standard the assembly is certified to | Matching the fixing positions while using a weaker anchor |
The trap that runs through the whole table is qualifying by drawing number. Two parts can share a drawing dimension and differ in every property that governs service life: spring rate, core hardness, thread form, body material, take-up range. Qualification is by performance and material, verified by test report and material certificate, not by dimensional match.
One further rule: qualify the second source before the first source fails. A second source qualified during a supply interruption is qualified under pressure, on a shortened sample cycle, with no time to detect the differences above. Qualification belongs in the manual as a scheduled activity, not as an emergency response.
The Documentation Pack and the Approval Gates
The manual is only as good as the paperwork it produces. Four documents carry the decisions.
| Document | Contains | Purpose |
| Hardware schedule | Every item, its family, its specification, its standard, and its approval status | The single list the bill of materials is drawn from |
| Interface schedule | Every shared dimension, its value, and its owner | Prevents interfaces from being inherited rather than decided |
| Approval samples | The physical reference part, sealed and labelled with revision | The arbiter when a delivered part is disputed |
| Compliance file | Test reports and certificates per family and per standard | Answers the customer's and the regulator's questions |
Standards worth naming in the schedule, so that a specification is a citation rather than an adjective:
| Standard | Covers |
| EN 15570 | Strength and durability of hinges; cycle classes |
| EN 15338 | Strength and durability of drawer runners and extension elements |
| EN 15939 | Strength and loading capacity of wall attachment devices |
| EN 14749 | Safety requirements for domestic and kitchen storage units |
| EN 1670 | Corrosion resistance of hardware |
| ISO 9227 | Neutral salt spray testing |
| ISO 2859-1 | Sampling procedures for inspection by attributes (AQL) |
| ISO 9001 | Quality management system |
The gates are three, and each has one question.
The pilot gate is the one most often skipped, and it is the gate that catches interface errors. Each family can pass its own test while the assembly fails, because the failure lives at the shared dimension.
Shelf support systems and their bore requirements
How a Selection Manual Fails
| Failure | How it appears | Prevention |
| Written as a catalogue | Buyers choose families independently and interfaces get inherited | Write it as a freeze order with an interface schedule |
| No named owner for an interface | A shared dimension is edited on one drawing only | One owner per interface, listed in the schedule |
| The drilling standard never written down | Panels that fit one supplier's hardware and nothing else | Make the standard decision 4, explicit and documented |
| Change classes not defined | A class C change approved as class B; the program is late | Classify before approving |
| Second source qualified by drawing number | A substitute passes dimensional inspection and fails in service | Qualify by performance and material certificate |
| Second source qualified during an interruption | Differences go undetected under schedule pressure | Qualify on a planned cycle |
| No sealed approval sample | Deliveries disputed with nothing to compare against | Seal and label a reference part per revision |
| Tests quoted as adjectives | "Tested to a high standard" cannot be verified or defended | Cite the standard and the class |
| Environment left to the end | A finish change after tooling, with its own lead time | Settle the corrosion class with the drawing |
| Load claims carried across interfaces | A foot rated at 500kg on a panel that fails first | Qualify load at the interface, not in isolation |
Specification Checklist
| # | Item | Why |
| 1 | The eight decisions, written in order | The order is what the manual is for |
| 2 | The drilling standard, stated explicitly | Every downstream bore position depends on it |
| 3 | The interface schedule, with a single owner per interface | Shared dimensions must be decided, not inherited |
| 4 | Door overlay and hinge reach, checked together | The most common source of late change |
| 5 | The runner system and the internal depth it leaves | Fixed together, and both hard to change later |
| 6 | The change classes, with approval authority per class | Turns a revision into a priced decision |
| 7 | Tooling and program lead times attached to class D and C changes | Prevents schedules that assume a swap |
| 8 | A second source per family, qualified by performance and material | Removes the single point of failure |
| 9 | Approved samples, sealed and revision-labelled | The arbiter in any delivery dispute |
| 10 | Standards cited by number and class, not by adjective | Makes the specification verifiable |
| 11 | The corrosion class settled with the drawing | A finish change after tooling has its own lead time |
| 12 | Sample, pilot, and production gates, with the pilot test at the interfaces | Catches errors that family-by-family testing misses |
We manufacture cabinet hardware across the connector, shelf support, leg and leveller, screw and fixing, and fitting families, in zinc alloy, steel, aluminium, brass, and stainless steel 304/316, with dimensional and material certificates issued per batch and corrosion performance tested to EN 1670 with salt spray testing to ISO 9227. Hinge and runner systems are tested to EN 15570 and EN 15338 with the cycle class declared, and AQL sampling follows ISO 2859-1. Custom plate patterns, connector bodies, and leg forms are available through our OEM engineering service.
Send us your hardware schedule and interface requirements
Conclusion
A cabinet hardware selection manual is judged by what it prevents, not by what it lists. The families are well understood and well documented across this site; the failure mode that actually costs money is a decision made in the wrong order, so that a change which would have been free on paper becomes a tooling project nine months into production.
Writing the manual as a freeze order — eight decisions, an interface schedule with a named owner for every shared dimension, and a change classification that prices a revision before it is approved — moves decisions to the left of that table, where they are cheap.
Key takeaways:
Cabinet Hardware and Connecting Fittings
Additional Resources
- Cabinet Connectors and Fittings
- Shelf Support Systems
- Legs, Plinth Feet, and Levellers
- Hardware Schedule Review
- ISO 9001 Manufacturing
About Shaxi Hardware
With over 15 years of experience manufacturing furniture hardware, Shaxi Hardware supplies cabinet producers and shopfitters across 40+ countries with hardware across the connector, shelf support, leg and leveller, screw and fixing, and fitting families, in zinc alloy, steel, aluminium, brass, and stainless steel 304/316. Our ISO 9001 certified production facility issues dimensional and material certificates per batch, tests corrosion performance to EN 1670 with salt spray testing to ISO 9227, tests hinge and runner systems to EN 15570 and EN 15338 with the cycle class declared, and samples by AQL to ISO 2859-1. Custom plate patterns, connector bodies, and leg forms are available through our OEM engineering service, with tooling and program lead times quoted before a change is approved.
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