4-Ton Rock Bag
The 4-Ton Texas Tuff Rock Bag — about 2.71 m³ of rock in a 2.4 m sphere — is the step up from the 2-Ton for higher-energy, heavy-civil scour protection.
The heavy-civil step up
The 4-Ton is the heavy-civil step up from the 2-Ton: enough mass and footprint to armor bridge piers and abutments, high-flow riverbanks, and port and berth toes against scour, while staying within the lift capacity of the excavators and cranes already on most heavy-civil sites. It resists grouped currents to around 17.4 ft/s.
It's a common choice in DOT bridge-scour packages and contractor revetments where the energy is too high for the 2-Ton but the conditions don't yet demand an offshore unit. Where currents, depth, or offshore exposure push past its range, the 8-Ton takes over.
4-Ton specifications
Engineering data ready to drop into a specification package. Download the full PDF spec sheet for project documentation.
| Nominal filled weight | ~4 tonnes |
|---|---|
| Fill volume | 2.71 m³ |
| Filled diameter | 2.4 m |
| Mesh aperture | 25 mm |
| Mesh construction | Raschel-weave virgin polyester |
| Lifting | Single-point, reinforced rope |
| Grouped current resistance | 17.4 ft/s |
| In-water design life | Long-term |
Full dimensions, materials, and hydraulic ratings for the 4-Ton.
Download spec sheetsEngineered mesh, not a sandbag.
Virgin polyester mesh
Raschel-weave virgin polymer — not recycled — for high UV and strong abrasion resistance in fresh and saline water, and a mesh that won't unravel if a strand is cut.
Single-point lift
Reinforced rope at a single lifting point gives operators highly controlled, precise placement — by excavator or crane, on land or in the wet.
Conforms to the bed
Filled on-site with local or supplied rock, the bag settles and conforms to scour and bed change instead of cracking like rigid concrete.
See the full material construction, standards, and testing on the specifications page.
4-Ton — common questions
When should I choose the 4-Ton over the 2-Ton?
Step up to the 4-Ton when the hydraulic loading exceeds the 2-Ton's range — higher flow velocities, deeper scour, bridge piers, or port and berth toes. It carries more mass and footprint while still placing with standard heavy-civil equipment. Run your numbers through the sizing calculator if you're between sizes.
Is the 4-Ton suitable for state DOT bridge scour projects?
Yes. It's commonly specified for state DOT and municipal bridge-scour work, backed by ASTM test data and certifications for the project documentation package. See the TxDOT Rains County case study.
When should I step up to the 8-Ton instead?
Move to the 8-Ton for severe currents, deeper water, or offshore and subsea exposure — its larger mass, 50 mm quad-layer mesh, and heavier rope are built for those conditions.
Compare the other sizes.
Light scour, small streambanks, residential and lakefront projects.
View Top pickMost-specified size — streambanks, shoreline revetment, and light-to-moderate scour.
ViewHeavy-civil size — bridges, riverbanks, and port toes in higher-energy conditions.
You're hereOffshore, oil & gas, and severe-current coastal applications.
ViewProject-specific applications where standard sizes don't fit. Talk to engineering for sizing.
ViewGet a quote on the 4-Ton.
Send your hydraulics, depth, and placement method and our engineering team will confirm sizing, lead time, and pricing — usually within one business day. Stocked inventory, fast lead times.