#11 Rebar (1-7/16 Inch Equivalent Bar)
Authoritative dimensional properties, unit weight, cross-sectional area, spacing tables, standard hook geometries, and ACI 318-19 tension development length for structural concrete design.
| Bar Designation | #11 | Code Standard | ASTM A615 / A706 |
| Nominal Diameter (db) | 1.41 in | Metric Diameter | 35.81 mm |
| Cross-Sectional Area (Ab) | 1.56 in² | Metric Area | 1006 mm² |
| Linear Weight | 5.313 lb/ft | Metric Mass | 7.907 kg/m |
| Nominal Perimeter | 4.43 in | Metric Perimeter | 112.5 mm |
| Minimum Clear Spacing | max(1.0″, 1.41″) | ACI Provision | ACI 318-19 §25.2.1 |
| Hook Type | Min. Inside Bend Pin | Extension Length (US) | Extension Length (SI) |
|---|---|---|---|
| 90° Standard Hook | 11.3″ (286 mm) | 16.9″ (12db) | 430 mm |
| 180° Standard Hook | 11.3″ (286 mm) | 5.6″ (max(4db, 2.5″)) | 143 mm |
Common Structural Applications
- ›Largest standard bar size permitted for standard lap splices (ACI 318-19 §25.5.1.1 restricts lap splices for #14 and #18)
- ›High-rise tower column cages and massive transfer mats
- ›Heavy infrastructure, marine docks, nuclear facility shear walls
Lap splice length in 4000 psi concrete exceeds 6 feet. Contact lap splices cause intense rebar congestion; full mechanical butt splices (Type 2) or headed rebar recommended.
#11 Rebar Spacing Table (As / Unit Width)
Area of longitudinal reinforcement provided for slabs, walls, and footing mats at given on-center spacings.
| 3″ o.c. | 4″ o.c. | 5″ o.c. | 6″ o.c. | 7″ o.c. | 8″ o.c. | 9″ o.c. | 10″ o.c. | 12″ o.c. | 14″ o.c. | 16″ o.c. | 18″ o.c. |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 6.240in²/ft | 4.680in²/ft | 3.744in²/ft | 3.120in²/ft | 2.674in²/ft | 2.340in²/ft | 2.080in²/ft | 1.872in²/ft | 1.560in²/ft | 1.337in²/ft | 1.170in²/ft | 1.040in²/ft |
ACI 318-19 Tension Development Length (ld)
Calculated using ACI 318-19 Section 25.4.2.3 simplified method for Grade 60 (420 MPa) deformed bars in normal-weight concrete with clear spacing ≥ db and clear cover ≥ db.
| Concrete Strength (f'c) | Bottom Bars (ld) [ψt = 1.0] | Top Bars (ld) [ψt = 1.3] | Governing Provision | Minimum Limit |
|---|---|---|---|---|
| 3,000 psi | 77.2″(1961 mm) | 100.4″(2550 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 4,000 psi | 66.9″(1699 mm) | 86.9″(2207 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 5,000 psi | 59.8″(1519 mm) | 77.8″(1976 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 6,000 psi | 54.6″(1387 mm) | 71″(1803 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
Design Reinforcement with #11 in AXIS
Run instant ACI 318-19 beam flexure, shear stirrup spacing, column P-M interaction, and development length checks with full KaTeX step-by-step audit logs.