No. 7 Stone: Size, Weight and Gradation
No. 7 stone has a nominal size of 1/2 in to No. 4 and weighs about 1.40 to 1.63 tons per cubic yard. Convert any amount below.
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No. 7 gradation
AASHTO M43 and ASTM D448 define No. 7 by how much passes each sieve. Ohio DOT lists its nominal size as 1/2 in to No. 4.
| Sieve | Opening | Percent passing |
|---|---|---|
| 3/4 in | 19.0 mm | 100 |
| 1/2 in | 12.5 mm | 90-100 |
| 3/8 in | 9.5 mm | 40-70 |
| No. 4 | 4.75 mm | 0-15 |
| No. 8 | 2.36 mm | 0-5 |
AASHTO M43-05 (ASTM D448) limits as tabled by FHWA.
How much No. 7 weighs
FHWA measured the dry unit weight of No. 7 at 103.3 lb per cubic foot loose and 120.9 lb dense. That is 2,790 to 3,264 lb, or 1.40 to 1.63 tons, per cubic yard.
FHWA notes that sizes larger than No. 9 classify as poorly graded gravels: the stones are mostly one size, which leaves open space between them.
| Amount | Loose | Dense |
|---|---|---|
| 1 cu yd | 1.40 tons | 1.63 tons |
| 2 cu yd | 2.79 tons | 3.26 tons |
| 5 cu yd | 6.97 tons | 8.16 tons |
| 10 cu yd | 13.9 tons | 16.3 tons |
Common questions
What size is No. 7 stone?
Its nominal size is 1/2 in to No. 4. The largest sieve it fully passes is 3/4 in (19.0 mm).
How much does a yard of No. 7 stone weigh?
FHWA's tests give 2,790 to 3,264 lb per cubic yard, from loose to dense.
How many yards are in a ton of No. 7 stone?
0.61 to 0.72 cubic yards.
Related calculators
Sources
- https://www.fhwa.dot.gov/publications/research/infrastructure/structures/bridge/15034/003.cfm
- https://spinternet.dot.state.oh.us/Divisions/ConstructionMgt/OnlineDocs/Specifications/2005CMS/700/703.htm