The figures this comparison usually turns on are not in our records
What we hold on these machines is measurement: overall dimensions on ten of the sixteen self-loading mixers in our records, a rated discharge figure on fourteen of them, a configuration list on all sixteen, and a customs record of what machines under this heading weigh when they cross a border. This page is built from those and it stops where they stop. What we do not hold is a productivity figure. Output per hour carries no confirmed value on any of the six mixer models published on this site, and there is no record anywhere of loads per shift, cubic metres placed in a day, fuel burned per hour, or the number of people a machine replaces. Those are the numbers a buyer most wants and the ones most easily written without a source. A figure without a source is not a figure, so none appears below.
Source: our published catalogue, where output per hour carries no confirmed value on any of the six mixer models; and our own machine records, which hold no productivity, fuel or labour figure of any kind. This section states an absence, not a figure.
The one comparison we can make from measurements
Width is where the two machines separate by a measurement rather than by an argument. Ten self-loading mixers in our records carry a measured width, and those run from 1.60 m to 2.30 m. The British Ready-Mixed Concrete Association's guide for site personnel tells the contractor to ensure suitable, stable and safe access for the truck, "the largest of which may be up to 10.5 metres long, 2.6 metres wide and 3.8 metres high and weigh 32 tonnes when fully loaded". Both ends of our band have to be quoted together. At 1.60 m a machine has a metre in hand against the widest truck the association describes; at 2.30 m it sits within 300 mm of that same maximum, and a lane that turned the largest truck away will most likely turn it away too. One of the ten is the SLM-18, at 2.21 m.
Those widths are recorded as the plants state them, and the posture each machine was measured in is documented for one of the ten. That matters for a height figure and barely at all for a width, which is why this page argues width and leaves height to the drawing. It is also why the band is quoted as a band. A buyer who takes 1.60 m as the category's width has read the narrow end of a range that is 700 mm wide, and the machine at the far end of it meets a tight gateway on much the same terms as the largest truck does. The question a width answers is a specific one — will this machine get down this lane — and it is answered model by model, not by the category.
Source: British Ready-Mixed Concrete Association and Mineral Products Association, Ready-Mixed Concrete – Practical guide for site personnel, first published 2017, updated June 2020, section 3.1 Site preparation, quoted as printed: https://brmca.org.uk/documents/BRMCA_Ready_Mixed_Concrete_Practical_guide_July_2020.pdf. Widths as recorded for ten of our sixteen self-loading mixers; the metre, the 300 mm and the 700 mm span are worked out here by subtraction.
The second measurement comes from customs, not from a brochure
Weight is the other figure that can be checked against something outside our own file. Across China's export declarations for HS 8705.40 from 2019 to 2024, restricted to destinations taking twenty units or more, the median destination-year averages 13,617 kg per machine declared under that heading, over 308 country-years; the mean of those averages is 13,425 kg and the coefficient of variation is 12.5 per cent. Three of the sixteen mixers in our records have an operating weight confirmed in writing: 5,800 kg and two at 8,500 kg. The direction of that comparison is plain and the size of it is not, for two reasons we will not paper over. The customs figure is net weight as declared for shipment, and whether that is the same basis as an operating weight has not been verified. And the heading covers concrete-mixer vehicles of both kinds, so the figure is a blend rather than a transit-mixer figure.
Source: China's export declarations for HS 8705.40, 2019 to 2024, destinations of twenty units or more, summarised in our own market research; the figure is a median of destination-year averages, unweighted by volume. The three operating weights are as declared by the plants, unladen.
Two delivery models, and the clock is what separates them
A transit mixer delivery is a radius drawn around a plant's address, and the same guidance puts a number on it. To be in accordance with the British standard the guide is written to, concrete is delivered within two hours after the time of loading when transported in truck mixers or agitators, reduced to within one hour where non-agitating equipment is used, unless a shorter time is specified or a longer time permitted by the specifier. The guide adds that those limits are generally satisfactory for normal UK temperatures and "may be considerably longer when colder or shorter when it is very hot". Its ordering section describes the other half of the commitment: measure the prepared location, calculate the volume required, take care not to overestimate because the excess may have to be disposed of as waste, and give as much notice as possible to the supplier. A volume and a time, both fixed before the day starts.
The self-loading machine answers a different geometry, because the concrete is batched where it is placed. All sixteen self-loading mixers in our records have a configuration list, and what those lists record is the cycle rather than a rate: a loading bucket on the machine itself; water carried on board on fifteen of the sixteen, eight of them with a large tank and a filling system and seven with a self-filling controller and an external suction pump that draws from a source on site; a drum that raises and slews through 270° on seven; a reversing and drum-monitoring camera on the same seven. The sixteenth list is itself recorded as incomplete, so that is a gap in our record rather than a machine without water. None of this is a claim about speed and we are not going to turn it into one. It describes a machine that does not need an address a plant can reach inside two hours.
Source: the same guide, section 4.2 Time limits and section 2.4 Ordering, quoted as printed. Configuration entries as recorded for all sixteen of our self-loading mixers; the counts of fifteen, eight, seven and seven are taken from those lists.
Where the waist joint changes the answer, and where it does not
Articulated steering is recorded on six of the sixteen mixer configuration lists, and on three of the published models it stands as a verified specification. One machine's list records front-wheel steering instead. The remaining nine name no steering type at all, and that is an absence in the record rather than a record of absence: it means nobody has confirmed it in writing, not that the machine steers one way or the other. An articulated machine pivots at the waist and turns in a shorter space than a rigid chassis that steers at its front wheels. What this page will not put on that is a number. No turning radius or turning circle is recorded for any of the sixteen mixers, so the shorter space stays a direction and never becomes a figure a buyer could plan a yard against.
The measurement that belongs next to it is length. The SLM-18 is 7.06 m long, the longest of the ten measured mixers by 1.61 m, and it is also one of the machines with articulation confirmed. Both facts are declared, and both belong in the same quotation, because a buyer reading only the steering type would picture a machine that turns inside its own yard while a buyer reading only the length would picture one that cannot get round a corner. Which of the two governs on a particular site is a question about that site's geometry, and the honest answer is that our records do not hold the number that would settle it. The model page for the SLM-18 carries every specification confirmed in writing for that machine, and it carries no turning figure either.
Source: the configuration lists held for our sixteen self-loading mixers — articulated steering on six, front-wheel steering on one, no steering entry on the other nine; the steering type is separately verified on three of the published models in our catalogue. The 7.06 m length and the 1.61 m difference come from the same dimension records. No turning radius is recorded for any of the sixteen.
What each machine is actually for
Rated discharge runs from 1.0 to 4.5 m³ a load across the fourteen of our sixteen mixers that carry a real figure, and the ten that also carry a measured width run 1.0 to 3.5 m³. Set that against the ordering procedure above, and the split stops being a question about machine quality. A pour whose volume is known before the day starts, at an address a truck can reach and discharge into directly, is a delivery problem. A pour that moves, or that is not fully known until the work is opened up, or that sits behind a gateway narrower than the 2.6 m the largest trucks need, is a batching problem, and batching at the pour is what the second machine does. Old city districts, sites with no plant inside the delivery window, rural self-build housing, road work where the pour front moves all day: those are geometry, not preference.
Two things sharpen this where it is hot. The guide's own note is that the two-hour limit suits normal UK temperatures and is shorter when it is very hot, and the same guide states that unless otherwise specified the temperature of the fresh concrete at delivery should not exceed 35°C. Both belong to the delivery model rather than to either machine, and both shrink the radius a plant can serve on exactly the days when the pour is hardest. We are not going to convert that into a market claim: we have not researched batching-plant coverage in any specific country and we are not going to assert one from an impression. It is stated here because a contractor who already knows how far his nearest plant is can do the arithmetic we cannot do for him.
Source: the rated-discharge figures recorded for fourteen of our sixteen self-loading mixers, 1.0 to 4.5 m³ per load as declared, of which the ten with a measured width run 1.0 to 3.5 m³. The gateway width and the ordering, time-limit and delivery-temperature statements are from the guide cited above, sections 2.4, 3.1, 4.2 and 4.3.
Where a transit mixer is simply the better answer
One large pour, at a fixed address, inside the plant's delivery window, where the truck can discharge directly into the works: that is the transit mixer's job, and no figure of ours argues otherwise. The largest load recorded anywhere in our mixer records is 4.5 m³, so a continuous pour of many multiples of that is a plant-and-truck operation and we would rather say so than lose the point. Two conditions travel with it, both from the same guidance. Where the truck cannot discharge directly into the works, transport must be provided to move the concrete from the delivery truck to the works — a front shovel or dumper for small volumes, usually a hired pump for larger ones. And a banksman must be provided to supervise the safe movement and positioning of the truck. Those costs appear after the concrete has been ordered, not before.
Which machine reaches the site is settled before any of this, and it is settled by measurement. The width band above decides the gateway; the shipping mode is decided the same way and separately, by the door-frame test in our container guide, where one machine in the range passes through a 40 ft container door whole and the rest are quoted out of gauge. A supplier who answers the transit-mixer question with a feature list is answering a different question from the one a contractor standing at his own gate is asking, which is whether the thing arrives at all. Access, the delivery radius and the shipping mode are the three that can be settled on paper before anyone commits money, and all three are settled with a tape measure rather than with an adjective. Everything downstream of them is a commercial conversation, and it is a shorter one once those three are closed.
Source: the guide cited above, section 3.1 Site preparation for the transport-to-works requirement and section 3.2 Receiving for the banksman requirement, quoted as printed. The 4.5 m³ is the largest declared load in our mixer records. The container verdict is the door-frame calculation already published in our shipping guide, not a new claim.