#10 Rebar (1-1/4 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 | #10 | Code Standard | ASTM A615 / A706 |
| Nominal Diameter (db) | 1.27 in | Metric Diameter | 32.26 mm |
| Cross-Sectional Area (Ab) | 1.27 in² | Metric Area | 819 mm² |
| Linear Weight | 4.303 lb/ft | Metric Mass | 6.404 kg/m |
| Nominal Perimeter | 3.99 in | Metric Perimeter | 101.3 mm |
| Minimum Clear Spacing | max(1.0″, 1.27″) | ACI Provision | ACI 318-19 §25.2.1 |
| Hook Type | Min. Inside Bend Pin | Extension Length (US) | Extension Length (SI) |
|---|---|---|---|
| 90° Standard Hook | 10.2″ (258 mm) | 15.2″ (12db) | 387 mm |
| 180° Standard Hook | 10.2″ (258 mm) | 5.1″ (max(4db, 2.5″)) | 129 mm |
Common Structural Applications
- ›Heavy high-rise columns carrying high axial compression and lateral drift moments
- ›Bridge substructure bents, abutments, and deep caissons
- ›Seismic shear wall boundary elements
Bend pin diameter is 8db = 10.16 inches. Difficult to field bend; pre-bent in fabricator shop. Couplers strongly recommended over contact lap splices to prevent rebar congestion.
#10 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. |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 5.080in²/ft | 3.810in²/ft | 3.048in²/ft | 2.540in²/ft | 2.177in²/ft | 1.905in²/ft | 1.693in²/ft | 1.524in²/ft | 1.270in²/ft | 1.089in²/ft | 0.953in²/ft | 0.847in²/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 | 69.6″(1768 mm) | 90.4″(2296 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 4,000 psi | 60.2″(1529 mm) | 78.3″(1989 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 5,000 psi | 53.9″(1369 mm) | 70″(1778 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
| 6,000 psi | 49.2″(1250 mm) | 63.9″(1623 mm) | ACI 318-19 Table 25.4.2.3 | ld ≥ 12″ (300 mm) |
Design Reinforcement with #10 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.