Hello, friends welcome to my site Mechical today’s topic deals with metrology in this topic we will know about **Limits, Fits, and Tolerance**.

In which we will know in detail what is limits, fits, and tolerance and also will know the types of limits, types of fits, and types of tolerances.

Before knowing limits, fits, and tolerances, First of all, we have to know the terminology which is used in limits, fits, and tolerance, So that we can better understand limits, fits, and tolerance.

When a machine is formed by combining the different types of metal parts together and it runs continuously to give output, but due to continuous working sometimes its parts get damaged, At that time, the stability with which the damaged parts get replaced by a new one is known as interchangeability of parts.

Interchangeability of the parts depends upon the many factors such as Limits, Fits, and Tolerance given between the mating parts.

Limits, fits, and tolerance plays the very most important role while designing and manufacturing any parts of a machine or elements.

So, in this topic, we will study the factors on which Limits, Fits, and Tolerance depend and their various related aspects.

So, let’s get started about limits, fits, and tolerance.

## Terminology used in Limits, Fits and Tolerance

- Basic Size
- Actual Size
- Deviation
- Allowance

### Basic Size

### Actual Size

### Deviation

- Upper Deviation
- Lower Deviation
- Actual Deviation
- Fundamental Deviation

#### Upper Deviation

#### Lower Deviation

Actual Deviation

Fundamental Deviation

### Allowance

- Maximum Allowance
- Minimum Allowance

#### Maximum Allowance

#### Minimum Allowance

## What are Limits, Fits, and Tolerance?

### Limits

### Fits

- Clearance Fit
- Interference Fit
- Transition Fit

#### Clearance Fit

#### Interference Fit

Transition Fit

ISI System for Limits and Fits in India, the act (IS 919-1959) under the British system is modified in 1963.

It has 18 series of basic tolerance to find out the different types of fits for the various types of diameters of shafts and holes.

It is represented by ITO1, ITO, IT1, IT2, IT16.

There are two methods for giving the desired allowance for fit, which are given below.

- Hole Basis System
- Shaft Basis System

#### Hole Basis System

#### Shaft Basis System

### Tolerance

- Unilateral Tolerance
- Bilateral Tolerance
- Fundamental Tolerance
- Geometrical Tolerance

#### Unilateral Tolerance

#### Bilateral Tolerance

#### Fundamental Tolerance

#### Geometrical Tolerance

- Form tolerance
- Attitude tolerance
- Location tolerance

## Newall System of Limits and Fits

- A series
- B series

### A series

### B series

## Conclusion

**Limits, fits, and tolerance**, if any query you are free to comment in the comment section.

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