CSA G30.18Metric
25M Rebar (Canadian Standard Metric)
Authoritative dimensional properties, unit weight, cross-sectional area, spacing tables, standard hook geometries, and ACI 318-19 tension development length for structural concrete design.
Nominal Diameter
0.992″
25.2 mm
Nominal Area (Ab)
0.775 in²
500 mm²
Unit Weight
2.637 lb/ft
3.925 kg/m
90° Standard Hook
11.9″ tail
Pin: 5.95″ (151 mm)
Cross-Sectional & Geometric PropertiesDual US & SI Units
| Bar Designation | 25M | Code Standard | CSA G30.18 |
| Nominal Diameter (db) | 0.992 in | Metric Diameter | 25.2 mm |
| Cross-Sectional Area (Ab) | 0.775 in² | Metric Area | 500 mm² |
| Linear Weight | 2.637 lb/ft | Metric Mass | 3.925 kg/m |
| Nominal Perimeter | 3.116 in | Metric Perimeter | 79.2 mm |
| Minimum Clear Spacing | max(1.0″, 0.992″) | ACI Provision | ACI 318-19 §25.2.1 |
ACI 318-19 Standard Hook Geometry (Table 25.3.1)
| Hook Type | Min. Inside Bend Pin | Extension Length (US) | Extension Length (SI) |
|---|---|---|---|
| 90° Standard Hook | 5.95″ (151 mm) | 11.9″ (12db) | 302 mm |
| 180° Standard Hook | 5.95″ (151 mm) | 4″ (max(4db, 2.5″)) | 101 mm |
CAD Cross-Section SchematicCSA G30.18
Nominal Linear Weight2.637 lb/ft (3.925 kg/m)
Common Structural Applications
- ›Heavy commercial beams and girders, column longitudinal cages
- ›Pile caps, raft foundations, and shear wall boundary elements
Engineering Detailing Note
Nominal area of 500 mm² (0.775 in²). High stiffness requires power benders for all hooks.
25M Rebar Spacing Table (As / Unit Width)
Area of longitudinal reinforcement provided for slabs, walls, and footing mats at given on-center spacings.
Metric Spacings (mm² of steel per linear metre of slab/wall)
| 75 mm o.c. | 100 mm o.c. | 125 mm o.c. | 150 mm o.c. | 175 mm o.c. | 200 mm o.c. | 250 mm o.c. | 300 mm o.c. | 400 mm o.c. |
|---|---|---|---|---|---|---|---|---|
| 6667mm²/m | 5000mm²/m | 4000mm²/m | 3333mm²/m | 2857mm²/m | 2500mm²/m | 2000mm²/m | 1667mm²/m | 1250mm²/m |
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 |
|---|---|---|---|---|
| 21 MPa (~3045 psi) | 1359 mm | 1766 mm | CSA A23.3 / ACI 318M | ld ≥ 300 mm |
| 28 MPa (~4060 psi) | 1177 mm | 1530 mm | CSA A23.3 / ACI 318M | ld ≥ 300 mm |
| 35 MPa (~5075 psi) | 1052 mm | 1368 mm | CSA A23.3 / ACI 318M | ld ≥ 300 mm |
| 42 MPa (~6090 psi) | 961 mm | 1249 mm | CSA A23.3 / ACI 318M | ld ≥ 300 mm |
Integrated Calculation Engine
Design Reinforcement with 25M 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.
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