One block, seven names
Bin block. Mafia block. Ecology block. Eco block. Lego block. Barrier block. Large concrete block. Seven names, one object: a 6 ft by 2 ft by 2 ft interlocking concrete block weighing about 3,600 lb.
This is the most confusing product in the concrete trade, and the confusion is entirely about vocabulary. A buyer in Portland calls a supplier in Ohio, asks for ecology blocks, and gets told they do not carry them. They do. They call them bin blocks.
Every name below describes the same thing: a block cast in a steel form, roughly six feet long and two feet square in section, with a lug on the top face and a matching recess underneath so blocks locate on each other when stacked. Weight runs about 3,600 lb, which is 150 lb per cubic foot of concrete times 24 cubic feet.
What does vary between plants is the exact lug pattern, the surface finish, and the color, particularly where blocks are cast from returned mix. Dimensions vary by an inch or so. None of that changes what the block does.
- Names for this block
- 7
- Objects behind them
- 1
- Nominal size
- 6' x 2' x 2'
- Weight
- 3,600 lb
The short answer
The naming table
| Name | Where you hear it | Where the name came from | Our page |
|---|---|---|---|
| Bin block | Midwest, South, most of the aggregate trade | Named for the job: the walls of a material bin at a yard, one bay per product. | Bin block page |
| Mafia block | Northeast, Chicago, New York | A jobsite nickname, from the size and weight of the thing and the joke that goes with it. Nobody writes it on a purchase order. | Mafia block page |
| Ecology block | Pacific Northwest, California | From the plant side: the blocks are commonly cast from returned ready-mix that would otherwise be washed out, so concrete leaves as a product rather than as waste. | Ecology block page |
| Eco block | Pacific Northwest | Ecology block, shortened. Same object. | Covered above |
| Lego block | Everywhere, informally | The cast lug and recess stack like the toy. Some plants use interlocking forms that make the resemblance obvious. | Covered above |
| Barrier block | Specification and municipal language | What it is called when the job is blocking access rather than holding material. | Covered above |
| Large concrete block | Search engines and catalogs | The plain description buyers use when they do not know the trade name. | Covered above |
Regional usage is what we hear from buyers and plants rather than a survey. Name origins for mafia and lego blocks are trade folklore: widely told, not documented. We are flagging that rather than presenting it as settled history.
What to say when you call a supplier
01
Give dimensions, not the nickname
"Six by two by two, about 3,600 pounds" is understood everywhere in the country. A nickname is understood in one region.
02
Ask how it lifts
Cast-in loop or a channel for rebar or cable. Turning up with the wrong hook costs a day, and the answer varies by the run your blocks come from.
03
Ask what the freight is, separately
13 per truck at about 46,800 lb. A quote that blends product and freight into one number is hiding which one moved.
Tell us the job. We send a number.
Product, count, delivery ZIP and the date you need it. The desk prices it and emails an itemized quote, freight included, within the hour during desk hours.