CSA G30.18Metric
20M 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
0.768″
19.5 mm
Nominal Area (Ab)
0.465 in²
300 mm²
Unit Weight
1.582 lb/ft
2.355 kg/m
90° Standard Hook
9.2″ tail
Pin: 4.61″ (117 mm)
Cross-Sectional & Geometric PropertiesDual US & SI Units
| Bar Designation | 20M | Code Standard | CSA G30.18 |
| Nominal Diameter (db) | 0.768 in | Metric Diameter | 19.5 mm |
| Cross-Sectional Area (Ab) | 0.465 in² | Metric Area | 300 mm² |
| Linear Weight | 1.582 lb/ft | Metric Mass | 2.355 kg/m |
| Nominal Perimeter | 2.413 in | Metric Perimeter | 61.3 mm |
| Minimum Clear Spacing | max(1.0″, 0.768″) | 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 | 4.61″ (117 mm) | 9.2″ (12db) | 234 mm |
| 180° Standard Hook | 4.61″ (117 mm) | 3.1″ (max(4db, 2.5″)) | 78 mm |
CAD Cross-Section SchematicCSA G30.18
Nominal Linear Weight1.582 lb/ft (2.355 kg/m)
Common Structural Applications
- ›Commercial beam longitudinal steel and multi-story building columns
- ›Retaining wall base stems and parking garage transfer beams
- ›Mat foundations and bridge decks
Engineering Detailing Note
Nominal area of 300 mm². Standard longitudinal bar across Canadian commercial engineering.
20M 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. |
|---|---|---|---|---|---|---|---|---|
| 4000mm²/m | 3000mm²/m | 2400mm²/m | 2000mm²/m | 1714mm²/m | 1500mm²/m | 1200mm²/m | 1000mm²/m | 750mm²/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) | 1051 mm | 1367 mm | CSA A23.3 / ACI 318M | ld ≥ 300 mm |
| 28 MPa (~4060 psi) | 910 mm | 1184 mm | CSA A23.3 / ACI 318M | ld ≥ 300 mm |
| 35 MPa (~5075 psi) | 814 mm | 1059 mm | CSA A23.3 / ACI 318M | ld ≥ 300 mm |
| 42 MPa (~6090 psi) | 743 mm | 966 mm | CSA A23.3 / ACI 318M | ld ≥ 300 mm |
Integrated Calculation Engine
Design Reinforcement with 20M 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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