A flat-rack container is a platform container without side walls and without a roof, usually with fixed or hinged end walls. This makes it possible to load extra-wide, extra-high or particularly heavy goods that do not fit into a standard box container (dry van). Typical applications:
Advantages: Maximum width/height clearance, precise load securing, crane or side loading possible.
Attention: Exposed cargo (weather, swell), detailed securing and stowage plan required, possible out-of-gauge (OOG) surcharges.
Important: The permissible gross weight (MGW/rating) is not equal to the possible payload - tare (empty weight) and securing material are deducted. In addition, concentrated loads and stacking/point load limits can significantly reduce the effective value. Shipping company specifications have priority.
The following typical dimensions are taken from current shipping company specifications (example: Hapag-Lloyd). Deviations are possible depending on the manufacturer/series - always check the equipment specification of the line used.
| Parameters | 20′ Flat rack (typical) | 40′ Flat rack (typical) | Source |
|---|---|---|---|
| Internal length (between end walls) | approx. 5.64 m | approx. 11.65 m | Hapag-Lloyd 20′ FR, Hapag-Lloyd 40′ FR/Platform |
| Width at floor/deck | 2,44 m | 2,35 m | see above. |
| Width (narrowest point, between corner posts) | approx. 2.19-2.21 m | approx. 2.24-2.25 m | see above. |
| Usable height under front frame | approx. 2.23 m | approx. 2.26 m | see above. |
| Floor height (frame height) | ~0,37 m | ~0,65 m | see above. |
| Max. Gross mass (rating, R) | up to 45,000 kg (depending on line) | up to 55,000 kg (depending on line) | see above; ISO 668 allows higher ratings with labelling |
| Typical payload | up to ~42,100 kg | up to ~49,100 kg | see above. |
Table description (alt text): Table shows common internal dimensions (length, width, height) and typical weight limits (gross/payload) for 20′ and 40′ flat-rack containers according to shipping company specifications 2025.
Note: ISO 668 defines external dimensions (20′: 6,058 × 2,438 × ~2,591 mm; 40′: 12,192 × 2,438 × ~2,591/2,896 mm). The internal dimensions vary depending on the design and are not documented in ISO 668, but in the manufacturer/reeder data sheets (see ISO note on internal dimensions).
The permissible surface load is higher than point concentrate loads (e.g. under crawler tracks, machine feet). Use distributors (hardwood/sleepers, steel plates) to transfer forces to the longitudinal and transverse beams.
Shipping companies often require the centre of gravity (x/y/z) to be specified. Position heavy components in the centre/longitudinally above load-bearing cross beams; avoid overloading end frames or overhanging loads without support.
Flat racks offer lashing points with defined LC values. Calculate the required number of lashing devices (tie-down/direct lashing) based on sea/handling acceleration factors. Shipping company specifications (e.g. minimum number, angle, pre-tensioning force) are binding.
The CSC sticker must be valid; securing/handling must follow ISO 3874 principles, among others. Also check local road/bridge limits for pre-/post-carriage.
Cost information: Specific prices depend on dimensions, weight, relation, season and OOG surcharges. Ask for a personalised quote - blanket price quotations are not useful here.
| Measuring point | Description of the | Tip |
|---|---|---|
| Total length | incl. possible overhangs/extensions | Always specify maximum value |
| Total width | widest point incl. fittings/tyres | Consider side covers |
| Total height | from top edge of deck to highest point | Measure crane hooks/eyes |
| Gross weight | Load incl. accessories/packaging | Weighing instead of estimating |
| COG (x/y/z) | Centre of gravity relative to the front left corner | Attach sketch |
| Lifting points | Permissible attachment/lifting points | Check manufacturer's manual |
Table description (alt text): Overview of the most important measuring points with description and practical tip for transmitting flat rack enquiries completely and correctly.
Are you wavering between RoRo, standard container and flat rack? Our guide will help you weigh up the options: Flat rack vs. container: When is which worthwhile?
Typical inside length approx. 5.64 m; width on deck 2.44 m; narrowest inside width between posts approx. 2.19-2.21 m; usable height under the front frame approx. 2.23 m. The exact values vary depending on the equipment; the data sheet of the shipping company (e.g. Hapag-Lloyd) is decisive.
Inside length approx. 11.65 m; width on deck ~2.35 m; inside between posts ~2.24-2.25 m; usable height ~2.26 m (depending on line).
ISO 668 specifies 36,000 kg as the standard rating; many flat racks are rated higher (e.g. 20′ to 45,000 kg, 40′ to 55,000 kg) if tested/marked. The CSC plate and the shipping company specification are decisive. Payload = MGW - tare - securing material.
Excess width >2.44 m, excess height over the front frame and excess length are possible, but are subject to approval and stowage position (often on-deck) and incur surcharges.
Yes for most flat rack loads (crane/reach stacker). Loading from the side is possible; plan lifting gear, lifting points and sufficient handling time.
Exact flatrack dimensions (L × W × H), gross weight, COG (with sketch), photos, lashing plan, desired equipment (20′/40′, fixed/folding end walls) and desired departure window (check timetables).
The basic dimensions and ratings are described in ISO 668; detailed dimensions (internal dimensions, LC values etc.) can be found in the data sheet of the shipping company or the container manufacturer (e.g. Hapag-Lloyd specifications).
Flat racks are the logistical solution when width, height or weight go beyond the scope of standard containers. If you record dimensions to the millimetre, interpret weight limits correctly and plan load securing professionally, you reduce risks, costs and delays - especially for OOG shipments. Check departure options via the timetables and compare methods with Flat rack vs. container: when is one worthwhile over the other?. For specific costs, you need a customised quotation based on your actual project dimensions.
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