Bar spacing and bar diameter are separate cage measurements. One describes the open gap available to the bird; the other describes the bar itself. A useful specification records both—and checks the different gaps created around doors, feeders, trays, dividers and modular joints.
Two measurements that should never be combined
The open gap between adjacent bar surfaces
Measure the shortest clear distance from the surface of one bar to the surface of the next. This is the space through which a head, beak, foot or body part could pass.
The thickness of the bar itself
Measure across a round bar with callipers. For a tube, also state that it is hollow and record wall thickness when structural comparison matters.
The centre-to-centre pitch is a third value. For two equal round bars in a straight field, the basic relationship is:
A 3 mm bar with a 19 mm clear gap has a 22 mm centre pitch. Saying only “22 mm spacing” would therefore describe the cage incorrectly.
Why “wire gauge” is not enough for an international order
English-language product pages sometimes state wire gauge instead of millimetres. Gauge is not a self-explanatory unit: different gauge systems and product forms can produce different diameters. A buyer may also use “wire” for a solid rod while a fabricator is thinking about tube, mesh wire or sheet-metal strips.
For a custom Bật Mạnh cage, the order record should use a measured diameter in millimetres and inches, then describe the form:
| Field | Useful wording | What remains unclear without it |
|---|---|---|
| Bar diameter | Solid round 304 stainless steel bar, Ø3 mm (0.118 in). | Whether the value refers to a solid bar, tube, mesh wire or gauge system. |
| Clear spacing | Approximately 19 mm (0.75 in) clear between adjacent bar surfaces. | Whether the number is an open gap or centre pitch. |
| Orientation | Vertical main bars; horizontal climbing bars on the specified face. | How the bird can climb and where the spacing applies. |
| Tolerance | Final workshop measurement recorded at several points. | Whether a nominal drawing value reflects the completed cage. |
How to measure a completed cage
- Choose a straight, undamaged bar field. Avoid a corner, weld transition or intentionally different decorative section for the first reading.
- Measure bar diameter. Use callipers across the outside surfaces of one bar. Rotate the callipers to check that the bar is round and the reading is repeatable.
- Measure the clear gap. Place the calliper jaws between adjacent bars without bending them. Record the shortest open distance.
- Repeat the reading. Check the top, middle and bottom of the field and both sides of a door. Do not publish only the most convenient result.
- Photograph the measurement. Show the tool, the exact location and enough of the cage to identify which gap was checked.
A ruler can give a useful first indication, but callipers are more suitable for small clearances and bar diameter. A workshop go/no-go gauge can make repeated production checks faster after the approved dimensions are known.
The main bar field is not the only escape or trapping point
A cage can have consistent main spacing and still contain a larger or smaller secondary gap. The complete review includes:
Why a universal species table can mislead
Clear spacing is part of containment and injury-risk review, but the bird name alone does not complete the decision. Adult size, head shape, beak strength, climbing behaviour, age, mobility and the number of occupants can change the requirement. A label such as “small parrot” also covers birds with very different proportions and behaviour.
Bật Mạnh therefore treats published dimensions as references for the documented cage—not as automatic approval for another bird. Send the accepted English or scientific species name, a clear photograph and a spacing already used successfully where possible. If suitability is uncertain, obtain species-specific advice from an avian veterinarian or experienced bird professional before fabrication.
Diameter relates to structure, but it does not work alone
A thicker bar may resist bending or beak damage better than a thinner bar of the same material and unsupported length. It does not guarantee a stronger cage by itself. Bar length between supports, frame stiffness, material form, joint design, weld or retaining method and the bird’s access to the bar all matter.
Similarly, reducing clear spacing by simply adding long bars can increase bar count without correcting inadequate support. For long flight cages, the frame, module length and intermediate support positions should be specified with the bar layout.
What the current Bật Mạnh examples actually confirm
| Documented cage | Bar information currently known | Do not infer |
|---|---|---|
| 50 × 30 × 30 cm compact flight cage | Approximately 1.8 mm bars and approximately 10 mm reference clear spacing. | That the same values suit every small songbird. |
| Approximately 80 × 38 × 50 cm modular flight cage | Approximately 12 mm reference clear spacing on the documented build. | A bar diameter that is not stated on the current source page. |
| 60 × 60 × 150 cm parrot cage | Solid Ø3 mm 304 stainless steel bars. | The clear spacing, which still needs workshop confirmation. |
| Five-compartment parrot system | Solid 3 mm bars and approximately 19 mm reference clear spacing. | Suitability for every parrot species or every secondary gap. |
What a complete product page should state
- Bar material, form and measured diameter in millimetres and inches.
- Clear main-field spacing and whether the value is nominal or measured.
- Bar orientation and any face with a different climbing layout.
- Different gaps around doors, feeders, trays, dividers and joints.
- The reference bird used for the completed configuration and any limitation.
- Who confirms a changed spacing before a made-to-order cage enters fabrication.
Compare the documented small-bird cages, flight cages and parrot cages without treating one spacing as universal. Then see how Bật Mạnh develops a complete cage specification and use the custom quotation checklist.
Discuss the bird, cage and installation space
Send the bird species, target dimensions and clear photographs for an early technical discussion. Overseas transport is reviewed separately and is not presented as a standard checkout service.