Sieve Numbers Openings

Overview

Engineering reference data for Sieve Numbers Openings in miscellaneous.

Key Formulas

Unit Conversion

$y = x \cdot k$

Multiply by conversion factor.

Linear Interpolation

$y = y_1 + \frac{(x - x_1)(y_2 - y_1)}{x_2 - x_1}$

Estimate between two known points.

Percentage

$p = \frac{\text{part}}{\text{whole}} \times 100\%$

Part as fraction of whole.

Variables

Symbol	Description	Unit
$x$	Input value	—
$y$	Output value	—
$k$	Conversion factor	—

Key Formulas

The fundamental relationship for the US Standard Sieve system defines the mesh number $M$:

$$M = \frac{1}{d}$$

Where:

• $M$ is the mesh number (in units of holes per inch).
• $d$ is the nominal aperture size of the sieve opening, in inches.

This formula is used to calculate the mesh number from a given opening size. The table above provides the corresponding sieve sizes in both millimeters and inches for common US Standard Mesh designations.

Mesh Number Explanation

The US Standard Mesh size is a dimensionless number that represents the number of openings per linear inch. A higher mesh number indicates a finer sieve with smaller openings. For example, a 200-mesh sieve has 200 openings per inch and is much finer than a 10-mesh sieve with 10 openings per inch. This system is critical for classifying and specifying particle sizes in materials such as aggregates, soils, and industrial powders.

Interactive Charts

References

• Original Source