**What Is Rebar Size and Rebar Diamters?**

Rebar size refers to the cross-sectional area of a reinforcing bar, expressed in square millimeters or square inches. The size of the rebar is an indicator of its strength and is specified by building codes and engineering standards.

Rebar diameter, on the other hand, refers to the thickness of the bar, expressed in millimeters or inches. The diameter of the rebar is a crucial factor in determining its strength, and it is usually related to the rebar size, with larger rebar sizes having larger diameters.

It’s worth noting that rebar sizes can vary between regions and countries, but common sizes include #3, #4, #5, #6, #7, #8, and #9, which correspond to rebar diameters ranging from approximately 9 mm to 51 mm.

## Types of Rebars

**1. Carbon Steel Rebars**

Carbon steel rebars are the most commonly used steel bars used in construction and it is sometimes also called “Black Rebar”.

But, one of the biggest drawbacks of this rebar is that it is easily catching **corrosion** compared to other types of rebar.

Therefore, It is not used in an area that is subjected to high humidity and in a structure that is continuously in contact with water.

But, It is one of the best rebars to be used in construction other than water contact.

**2. Welded Wire Fabric**

It is manufactured by electrically welding a series of steel wires arranged at a right angle. It is mostly used for ground-level slabs where the ground is properly compacted and leveled.

These types of rebars are used for box culverts, road **pavement**, drainage structures, and small concrete canal construction work.

**3. Sheet-Metal Reinforcing Bars**

It is manufactured from annealed sheet steel pieces and bent in a corrugated shape with 1/6-inch deep holes punched at a specified distance.

These bears are mainly used for roof construction, floor slab, and stairs formation work.

**4. Epoxy-Coated Rebars**

Expoxy Coated Rebars are one of the expensive types of rebars that are used in an area where the structure keeps continuous contact with seawater and high humidity area.

Its coating must be done properly for the best result otherwise it is also liable to **corrosion**.

**5. European Rebars**

European Steel Rebars are generally manufactured from manganese mineral material which is having the property of easily bending.

These types of rebars are not suggested to be used in extreme weather conditions such as earthquake-prone zones, hurricanes, and rainstorms areas.

### 6. **Stainless Steel Rebars**

Stainless steel rebars are used as alternative rebar with carbon steel reinforcement bars. Stainless steel rebars are corrosion resistance coating on it which is the best option in an area that has **corrosion **problems.

But, Its cost is nearly eight times the cost of carbon steel rebars.

### 7. **Galvanized Rebars**

These rebars are most suitable for making strong structures that are supposed to expose in an area of highly humid conditions. Galvanized Rebars are 40 times more corrosion-resistant compared to normal carbon steel rebars.

**Read More: How Many Bags of Concrete Do I Need For 10×10 Slab**

**Different Types of Rebar and Their Size**s

- 3 rebar diameter
- 4 rebar diameter
- 5 rebar diameter
- 6 rebar diameter
- 7 rebar diameter
- 8 rebar diameter
- 9 rebar diameter
- 10 rebar diameter
- 11 rebar diameter
- 14 rebar diameter
- 18 rebar diameter

**#3 Rebar Size and Diameter**

3 Rebar diameters are made from carbon steel composite materials. It is mostly used for patio work, driveway construction, road work, and highway construction work.

3 Rebar is popularly known as “10 mm” diameter rebar,

**3 Rebar Diameter:**

#3 Rebar diameter in the metric system is 10 mm.

#3 Rebar nominal diameter in Inch is 0.375 inch

#3 Rebar nominal diameter in mm is 9.525 mm

**3 Rebar Weight per unit length (lb/ft):**

#3 Rebar unit weight per length is 0.376 lb/ft

#3 Rebar unit weight per length is 0.561 kg/m

**3 Rebar C/S Area:**

#3 Rebar Nominal Area in Inch is 0.1 inch^{2}

#3 Rebar Nominal Area in mm is 71 mm^{2}

**#4 Rebar Size and Diameter**

4 Rebar diameter is made from a sturdy composite of carbon steel. It is mostly used for commercial and residential construction work.

4 Rebar is popularly known as a “13 mm” diameter rebar,

**4 Rebar Diameter:**

#4 rebar diameter in the metric system is 13 mm.

#4 rebar nominal diameter in Inch is 0.50 inch (1/2 In.)

#4 rebar nominal diameter in mm is 12.70 mm

**4 Rebar Weight per unit length (lb/ft):**

#4 Rebar unit weight per length is 0.668 lb/ft

#4 Rebar unit weight per length is 0.996 kg/m

**4 Rebar C/S Area:**

#4 Rebar Nominal Area in Inch is 0.2 inch^{2}

#4 Rebar Nominal Area in mm is 129 mm^{2}

**#5 Rebar Size and Diameter**

5 Rebar diameter is made from carbon steel composite materials. It is mostly used for precast components construction which is used for canal, bridge, and road construction.

5 Rebar is popularly known as a “16 mm” diameter rebar,

**5 Rebar Diameter:**

#5 rebar diameter in the metric system is 16 mm.

Its nominal diameter in Inch is 0.625 inches (5/8 In.)

Its nominal diameter in mm is 15.875 mm

**5 Rebar Weight per unit length (lb/ft):**

#5 Rebar unit weight per length is 1.043 lb/ft

#5 Rebar unit weight per length is 1.556 kg/m

**5 Rebar C/S Area:**

#5 Rebar Nominal Area in Inch is 0.31 inch^{2}

#5 Rebar Nominal Area in mm is 200 mm^{2}

**#6 Rebar Size and Diameter**

6 Rebar diameters are made from carbon steel composite materials. It is mostly used for heavy foundation and footing construction.

6 Rebar is popularly known as a “19 mm” diameter rebar,

**6 Rebar Diameter:**

#6 rebar diameter in the metric system is 19 mm.

Its nominal diameter in Inch is 0.750 inches (3/4 In.)

Its nominal diameter in mm is 19.05 mm

**6 Rebar Weight per unit length (lb/ft):**

#6 Rebar unit weight per length is 1.502 lb/ft

#6 Rebar unit weight per length is 2.24 kg/m

**6 Rebar C/S Area:**

#6 Rebar Nominal Area in Inch is 0.44 inch^{2}

#6 Rebar Nominal Area in mm is 284 mm^{2}

**#7 Rebar Size and Diameter**

7 Rebar diameters are made from carbon steel composite materials. It is mostly used for medium to heavy concrete construction work.

7 Rebar is popularly known as a “22 mm” diameter rebar,

**7 Rebar Diameter:**

#7 rebar diameter in the metric system is 22 mm.

Its nominal diameter in Inch is 0.875 inches (3/4 In.)

Its nominal diameter in mm is 22.225 mm

**7 Rebar Weight per unit length (lb/ft):**

#7 Rebar unit weight per length is 2.044 lb/ft

#7 Rebar unit weight per length is 3.049 kg/m

**7 Rebar C/S Area:**

#7 Rebar Nominal Area in Inch is 0.6 inch^{2}

#7 Rebar Nominal Area in mm is 387 mm^{2}

### #**8 Rebar Size and Diameter**

8 Rebar diameter is made from carbon steel composite materials. It is mostly used in high-strength construction work.

8 Rebar is popularly known as a “25 mm” diameter rebar,

**8 Rebar Diameter:**

#8 rebar diameters in the metric system is 25 mm.

8 rebar nominal diameter in Inch is 1.000 inches

3 rebars nominal diameter in mm is 25.40 mm

**8 Rebar Weight per unit length (lb/ft):**

#8 Rebar unit weight per length is 2.67 lb/ft

#8 Rebar unit weight per length is 3.982 kg/m

**8 Rebar C/S Area:**

#8 Rebar Nominal Area in Inch is 0.79 inch^{2}

#8 Rebar Nominal Area in mm is 509 mm^{2}

**#9 Rebar Size and Diameter**

9 Rebar diameters are made from carbon steel composite materials. It is mostly used in retaining walls, abutments, columns, and beam construction.

9 Rebar is popularly known as a “29 mm” diameter rebar.

**9 Rebar Diameter:**

#9 rebar diameters in metric system is 29 mm.

9 rebar nominal diameter in Inch is 1.128 inches

9 rebars nominal diameter in mm is 28.65 mm

**9 Rebar Weight per unit length (lb/ft):**

#9 Rebar unit weight per length is 3.40 lb/ft

#9 Rebar unit weight per length is 5.071 kg/m

**9 Rebar C/S Area:**

#9 Rebar Nominal Area in Inch is 1.00 inch^{2}

#9 Rebar Nominal Area in mm is 645 mm^{2}

**#10 Rebar Size and Diameter**

10 Rebar diameter is made from carbon steel composite materials. It is mostly used for heavy-duty construction work.

10 Rebar is popularly known as “32 mm” diameter rebar,

**10 Rebar Diameter:**

#10 rebar diameter in the metric system is 32 mm.

10 rebar nominal diameter in Inch is 1.27 inch

10 rebar nominal diameter in mm is 32.26 mm

**10 Rebar Weight per unit length (lb/ft):**

#10 Rebar unit weight per length is 4.303 lb/ft

#10 Rebar unit weight per length is 6.418 kg/m

**10 Rebar C/S Area:**

#10 Rebar Nominal Area in Inch is 1.27 inch^{2}

#10 Rebar Nominal Area in mm is 819 mm^{2}

**#11 Rebar Size and Diameter**

11 Rebar diameter is made from carbon steel composite materials. It is mostly used for high-quality construction work.

11 Rebar is popularly known as “36 mm” diameter rebar,

**11 Rebar Diameter:**

#11 rebar diameters in the metric system are 36 mm.

11 rebar nominal diameter in Inch is 1.41 inch

11 rebar nominal diameter in mm is 35.81 mm

**11 Rebar Weight per unit length (lb/ft):**

#11 Rebar unit weight per length is 5.313 lb/ft

#11 Rebar unit weight per length is 7.924 kg/m

**11 Rebar C/S Area:**

#11 Rebar Nominal Area in Inch is 1.56 inch^{2}

#11 Rebar Nominal Area in mm is 1006 mm^{2}

**#14 Rebar Size and Diameter**

14 Rebar diameter is made from carbon steel composite materials. It is mostly used for tall buildings, parking structures, bridges, docks, and industrial facilities.

14 Rebar is popularly known as “43 mm” diameter rebar,

**14 Rebar Diameter:**

#14 rebar diameters in the metric system are 43 mm.

14 rebar nominal diameter in Inch is 1.693 inch

14 rebar nominal diameter in mm is 43 mm

**14 Rebar Weight per unit length (lb/ft):**

#14 Rebar unit weight per length is 7.65 lb/ft

#14 Rebar unit weight per length is 11.41 kg/m

**11 Rebar C/S Area:**

#14 Rebar Nominal Area in Inch is 2.25 inch^{2}

#14 Rebar Nominal Area in mm is 1452 mm^{2}

**18 Rebar Size and Diameter**

18 Rebar diameter made from carbon steel composite materials. It is mostly used for bridges and construction projects in marine environments.

18 Rebar is popularly known as a “57 mm” diameter rebar.

**18 Rebar Diameter:**

**#18 rebar diameter** in metric system is 57 mm.

18 rebar nominal diameter in Inch is 2.257 inch

18 rebar nominal diameter in mm is 57.33 mm

**18 Rebar Weight per unit length (lb/ft):**

#18 Rebar unit weight per length is 13.6 lb/ft

#18 Rebar unit weight per length is 20.284 kg/m

**18 Rebar C/S Area:**

#18 Rebar Nominal Area in Inch is 4.00 inch^{2}

#18 Rebar Nominal Area in mm is 2581 mm^{2}

**Read More: How Many Bags Of Concrete In A Yard | How Many Bags of Concrete Do I Need**

## Rebar Size Chart and Rebar Diameter Chart

Imperial Bar Size | Weight per unit length (lb/ft) | Mass per unit length (kg/m) | Nominal Diameter (in) | Nominal Diameter (mm) | Nominal Area(in2) | Nominal Area (mm2) |

#3 | 0.376 | 0.561 | 0.375 | 9.525 | 0.11 | 71 |

#4 | 0.668 | 0.996 | 0.500 | 12.7 | 0.2 | 129 |

#5 | 1.043 | 1.556 | 0.625 | 15.875 | 0.31 | 200 |

#6 | 1.502 | 2.24 | 0.750 | 19.05 | 0.44 | 284 |

#7 | 2.04 | 3.049 | 0.87 | 22.225 | 0.60 | 387 |

#8 | 2.67 | 3.982 | 1.000 | 25.4 | 0.79 | 509 |

#9 | 3.4 | 5.071 | 1.128 | 28.65 | 1 | 645 |

#10 | 4.303 | 6.418 | 1.27 | 32.26 | 1.27 | 819 |

#11 | 5.313 | 7.924 | 1.41 | 35.81 | 1.56 | 1006 |

#14 | 7.65 | 11.4 | 1.693 | 43 | 2.25 | 1452 |

#18 | 13.6 | 20.284 | 2.257 | 57.33 | 4 | 2581 |

## Manufacturing Process of Rebar

The manufacturing process of rebar involves various stages,

Step 1: Raw Material Preparation: Steel billets are produced from iron ore, coal, and limestone in a blast furnace.

Step 2: Rolling: Steel billets are heated and then rolled into the desired size and shape, typically in a long continuous process.

Step 3: Bending: The rebar is bent into its final shape using a rebar bender.

Step 4: Cutting: The rebar is cut to the desired length using a rebar cutter.

Step 5: Straightening: The rebar is straightened to remove any twists or deformities.

Step 6: Inspection and Testing: The rebar is inspected and tested for quality and conformity to industry standards.

Step 7: Marking: The rebar is marked with identifying information, including the manufacturer, size, and grade.

Step 8: Packaging: The rebar is packaged and prepared for shipment to construction sites.

The process is performed in a steel mill, with specialized equipment and trained personnel to ensure a high-quality product. The process is designed to produce rebar that is strong, durable, and resistant to corrosion and other environmental factors.

## Conclusion

In conclusion, rebar size and rebar diameter are important factors in determining the strength of reinforcing bars used in construction.

Rebar size refers to the cross-sectional area of the bar, while rebar diameter refers to the thickness of the bar. Rebar sizes can vary between regions and countries and are determined based on building codes and engineering standards.

Larger rebar diameters generally result in higher strength, but other factors such as the material used and the number of rebar pieces also impact the overall strength of a rebar system.

Understanding rebar size and diameter is crucial for selecting the appropriate rebar for a construction project.

## FAQs:

### What is rebar size?

Rebar size refers to the cross-sectional area of a reinforcing bar, expressed in square millimeters or square inches. It determines the strength of the rebar and is specified by building codes and engineering standards.

### What is rebar diameter?

Rebar diameter refers to the thickness of a reinforcing bar, expressed in millimeters or inches. It is an important factor in determining the strength of the rebar and is usually related to the rebar size.

### What are the most common rebar sizes?

Common rebar sizes include #3, #4, #5, #6, #7, #8, and #9, which correspond to rebar diameters ranging from approximately 9 mm to 51 mm.

### How does rebar diameter affect its strength?

The diameter of the rebar is a crucial factor in determining its strength. Larger rebar diameters generally result in higher strength, but other factors such as the material used and the number of rebar pieces also impact the overall strength of a rebar system.

### What are the most common rebar sizes?

Common rebar sizes include #3, #4, #5, #6, #7, #8, and #9, which correspond to rebar diameters ranging from approximately 9 mm to 51 mm.

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