#5 Rebar (5/8 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 | #5 | Code Standard | ASTM A615 / A706 |
| Nominal Diameter (db) | 0.625 in | Metric Diameter | 15.88 mm |
| Cross-Sectional Area (Ab) | 0.31 in² | Metric Area | 199 mm² |
| Linear Weight | 1.043 lb/ft | Metric Mass | 1.552 kg/m |
| Nominal Perimeter | 1.963 in | Metric Perimeter | 49.9 mm |
| Minimum Clear Spacing | max(1.0″, 0.625″) | ACI Provision | ACI 318-19 §25.2.1 |
| Hook Type | Min. Inside Bend Pin | Extension Length (US) | Extension Length (SI) |
|---|---|---|---|
| 90° Standard Hook | 3.75″ (95 mm) | 7.5″ (12db) | 191 mm |
| 180° Standard Hook | 3.75″ (95 mm) | 2.5″ (max(4db, 2.5″)) | 64 mm |
Common Structural Applications
- ›Light-to-medium beam longitudinal flexural reinforcement
- ›Cantilever retaining wall vertical stems (8 ft to 14 ft)
- ›Two-way suspended floor slabs and bridge deck top/bottom mats
- ›Commercial isolated spread footings and foundation grade beams
Weighs almost exactly 1 lb per foot (1.043 lb/ft). Requires mechanical or hydraulic benders on site. Minimum clear spacing between parallel bars is 1.0 in or 1db per ACI 318-19 §25.2.1.
#5 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. |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.240in²/ft | 0.930in²/ft | 0.744in²/ft | 0.620in²/ft | 0.531in²/ft | 0.465in²/ft | 0.413in²/ft | 0.372in²/ft | 0.310in²/ft | 0.266in²/ft | 0.232in²/ft | 0.207in²/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 | 27.4″(696 mm) | 35.6″(904 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 4,000 psi | 23.7″(602 mm) | 30.8″(782 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 5,000 psi | 21.2″(538 mm) | 27.6″(701 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 6,000 psi | 19.4″(493 mm) | 25.2″(640 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
Design Reinforcement with #5 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.