# What do the numbers on rebar mean?

6 min read

##### Asked by: Ralph Carrillo

It’s actually quite easy. **The number represents a unit of 1/8 of an inch**. So that means a #4 rebar is 4 times 1/8″ or in other words – 1/2″. #5 bar is 5/8″; #6 bar is 3/4″ and so on. To cut and bend your rebar, check out the rebar cutters and rebar benders at Fascut Industries.

## What is stronger #3 or #4 rebar?

For example, common #3 type rebar features a minimum yield strength of 6,600 lbs, whereas #4 type rebar has a total yield strength of 11,780 lbs, or **about 78% greater than #3**.

## What is stronger #4 or #5 rebar?

For walls and columns, **#4** rebar size should be used as they require more strength. It is better to use the #5 rebar size for footers and foundations.

## What does number 3 rebar mean?

Rebar is sized nominally by “eighths of an inch” of the bar’s diameter. Every bar can be measured in eighths of an inch. A #3 bar is **3/8″ in diameter**.

## What does number 5 tell you about the size of rebar?

We are calculating the size of number 5/ #5 rebar used in US based Imperial system, **Imperial bar sizes gives the size/ diameter in units of 1/8 inch**, using formula, imperial, size of #5 rebar = 5 × 1/8 inch = 5/8 inch = 0.625 inch, converting into mm which is equal to 15.875mm, their soft metric size is #16 (number 16 …

## How far apart should rebar be spaced?

approximately 12 inches

Place rebar in a grid pattern with a spacing between bars of **approximately 12 inches**. In either case, blocks should be used under the reinforcement to keep centered within the concrete. Synthetic fibers have also proven to be beneficial in driveways as a way to reduce shrinkage cracks.

## How far should rebar be placed from edge of concrete?

For welded wire reinforcement, the Wire Reinforcement Institute recommends steel placement **2 inches below the surface or within the upper third of the slab thickness**, whichever is closer to the surface.

## How thick is a number 12 piece of rebar?

#12 Rebar

Imperial Bar Size | “Soft” Metric Size | Nominal Diameter (in) |
---|---|---|

#12 | #40 |
1.5 |

## How thick should rebar be?

Common Rebar Sizes

Contractors sometimes use the “1/8 Rule,” meaning the size of the rebar is **1/8 the thickness of the slab**. For example, a slab that is 6 inches thick might have rebar marked as size 6 or 3/4-inch. Slabs for septic tanks may require the use of both welded wire fabric and rebar.

## What is 10M rebar?

What size is 10m rebar:- metric bar size designation represents the nominal bar diameter in millimetres, rounded to the nearest 5, nominal diameter of 10M rebar is 11.3mm, it is rounded to 10mm, size/ diameter of 10M rebar is equal to their nominal diameter in mm, so size/ diameter of 10M rebar is **11.3 in mm or 0.45** …

## What size rebar should be used on a 4 slab?

For 4” concrete slabs used for driveways and patios, **#3** rebar is common. Driveways that will support daily traffic by heavy trucks frequently use 1/2″ or #4 steel bar.

## What size hole do I drill for 1/2 rebar?

Project Instructions. Drill a hole **1/16 to 1/4 inch larger than the diameter of the threaded rod or railing you are setting**. TIP: the hole depth should be a minimum of 4 1/2 times the diameter of the bolt (a 1/2 inch threaded rod would require a hole depth of 2 1/4 inches).

## What is the difference between grade 40 and grade 60 rebar?

Grade 40 has a minimum yield strength of 40,000 PSI and a minimum tensile strength of 60,000 PSI. By comparison, grade 60 rebar has a minimum yield strength of 60,000 PSI and a minimum tensile strength of 90,000 PSI.

## What is the meaning of 500w Rod?

**The number 500 here indicates the yield strength of the bar**. This is measured in pascals and indicates that the yield strength of these bars is 500 pascals. The ‘W’ indicates that these bars are weldable. To be weldable steel bars need to be more ductile.

## Can you weld rebar instead of tying?

**Yes, rebar can be welded in concrete to form reinforced concrete**. However, not all grades of rebar can be welded in steel. Only low-alloy, grade-W rebar is weld-able.

## What is the strongest rebar?

#18 rebar

Reinforcing bar or “rebar” is available in a complete range of standard sizes, and **#18 rebar** is one of the largest and strongest. Rebar works to provide additional stability to concrete structures by reducing the weight load the concrete must bear and enhancing its inherent tensile strength.

## Why is some rebar green?

Epoxy coated rebar also referred to as green rebar, is **used in concrete subjected to corrosive conditions**. These may include exposure to deicing salts or marine environments. Epoxy coated rebar or corrosion resistant rebar is utilized in the following structures: Bridges.

## What kind of reinforcing bar will you use tempered or plain reinforcing bars?

The most commonly used variety of rebar is **tempered steel rebar**, also known as carbon steel rebar or black bar. It is inexpensive but corrodes more easily than other types of rebar.

## How big of rebar do they make?

Rebar Size Chart

Imperial Bar Size | Weight (lb/ft) | Nominal Diameter (in) |
---|---|---|

#5 |
1.043 |
0.625 |

#6 |
1.502 |
0.750 |

#7 |
2.044 |
0.875 |

#8 |
2.670 |
1.000 |

## What number is 1/2 inch rebar?

US Rebar Weight and Dimensions

Imperial Bar Size | “Soft” Metric Size | Nominal Diameter |
---|---|---|

inch | ||

#4 |
#13 |
0.500 = ^{1}/_{2}“ |

#5 | #16 | 0.625 = ^{5}/_{8}“ |

#6 | #19 | 0.750 = ^{3}/_{4}“ |

## How much rebar do I need for a slab?

If your foundation is 32 inches, then multiply 32 inches times 35 slots and you get the total number of inches of rebar you need, which is 1,120 inches. You will then need to convert that to feet, which is 1,120 divided by 12 equals 93.3 feet. You will need **five sticks of 20 foot rebar for the vertical runs**, as well.

## What size is #2 rebar?

U.S. imperial dimensions of rebar

Bar No. | Weight (lb/ft) | Nominal Diameter (in) |
---|---|---|

2 | 0.166 | 0.25 = 1/4 |

3 | 0.376 | 0.375 = 3/8 |

4 | 0.668 | 0.500 = 1/2 |

5 | 1.043 | 0.625 = 5/8 |

## What size rebar is #4?

0.5 inches

Physical characteristics of #4 Rebar:

**Nominal diameter: 0.5 inches (12.7 millimeters)** **Nominal area: 0.2 square inches (129 square millimeters)**

## What is #4 rebar used for?

Made from carbon-steel composite, #4 reinforcing bar or “rebar” is is used **to pave roads and highways, and in certain climates, it can also be used to build swimming pool frames**. It is often trusted as a strengthening material in slabs, piers, columns and walls.

## What size is #10 rebar?

1 1/8 inches

Standard rebar classifications rate the bars by diameter, with #10 rebar measuring a diameter of **1 1/8 inches**. This makes #10 rebar well-suited for use in medium- to heavy-duty construction projects, since concrete structures benefit from rebar’s high tensile strength.

## How do you read rebar size?

**The first letter or symbol means producing mill and deformation pattern.**

- The second marking means the bar size, in this picture, ” 11 ” means the diameter of this rebar is #3.
- The third letter represents the type of steel as follow: S: Carbon-steel (A615). …
- The last marking shows the grade of reinforcing bar.

## What size is #7 rebar?

0.875 inches

Physical characteristics of #7 Rebar:

**Nominal diameter: 0.875 inches (22.225 millimeters)** **Nominal area: 0.6 square inches (387 square millimeters)**