#6 Rebar (3/4 Inch Reinforcing 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 | #6 | Code Standard | ASTM A615 / A706 |
| Nominal Diameter (db) | 0.75 in | Metric Diameter | 19.05 mm |
| Cross-Sectional Area (Ab) | 0.44 in² | Metric Area | 284 mm² |
| Linear Weight | 1.502 lb/ft | Metric Mass | 2.235 kg/m |
| Nominal Perimeter | 2.356 in | Metric Perimeter | 59.8 mm |
| Minimum Clear Spacing | max(1.0″, 0.75″) | ACI Provision | ACI 318-19 §25.2.1 |
| Hook Type | Min. Inside Bend Pin | Extension Length (US) | Extension Length (SI) |
|---|---|---|---|
| 90° Standard Hook | 4.5″ (114 mm) | 9″ (12db) | 229 mm |
| 180° Standard Hook | 4.5″ (114 mm) | 3″ (max(4db, 2.5″)) | 76 mm |
Common Structural Applications
- ›Standard primary flexural reinforcement for commercial beams and girders
- ›Medium commercial columns (4 to 8 bars per cross section)
- ›Thick mat foundations and retaining wall heel/toe footing slabs
- ›Structural shear walls (vertical boundary and web steel)
Governing boundary size for ACI 318-19 simplified development length equations (<= #6 qualifies for the 0.8 bar size factor ψs). Bend pin diameter is 6db = 4.5 inches.
#6 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. |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.760in²/ft | 1.320in²/ft | 1.056in²/ft | 0.880in²/ft | 0.754in²/ft | 0.660in²/ft | 0.587in²/ft | 0.528in²/ft | 0.440in²/ft | 0.377in²/ft | 0.330in²/ft | 0.293in²/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 | 32.9″(836 mm) | 42.7″(1085 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 4,000 psi | 28.5″(724 mm) | 37″(940 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 5,000 psi | 25.5″(648 mm) | 33.1″(841 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 6,000 psi | 23.2″(589 mm) | 30.2″(767 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
Design Reinforcement with #6 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.