# Diamond Micron Powder Grit Size Chart

> One-page grit chart mapping W0.25–W60 micron powder grades to GB/T 6406 M-designations, FEPA–ISO 6106 D-grades and approximate JIS mesh, plus polishing/lapping/grinding bands.

Canonical: https://xtdiamond.com/downloads/grit-size-chart/
Published: 2026-11-07T09:54:01.763Z
Updated: 2026-11-07T09:54:01.763Z
Last reviewed: 2026-11-07T09:54:01.763Z
Reviewed by: admin

## TL;DR

Fifteen micron-powder grades (W0.25 to W60) cross-referenced across four designation systems: China W, GB/T 6406 M-grades, FEPA–ISO 6106 D-grades and approximate JIS mesh. Cross-references are nominal — always specify in microns; final grade and tolerance are confirmed in writing at quotation.

Different standards grade micron powder by different principles — size interval, median diameter or sieving — so no designation has a perfect equivalent in another system. This chart gives the customary approximate mapping used across the trade.

## What the chart covers

- **China W grades** with nominal micron ranges, W0.25 through W60.
- **GB/T 6406** M-designations (identical in principle to ISO 6106:2013; inspection methods per JB/T 7990-2012).
- **FEPA / ISO 6106** D-grades for micron powders.
- **JIS approximate mesh** numbers on a median-diameter basis.
- **Typical use bands**: polishing ≈ W0.25–W10, lapping ≈ W5–W20, fine grinding ≈ W20 and coarser.

## How to use it

When specifying, give the micron range or W grade rather than a mesh number alone. If you are converting from a current product's datasheet, send us the designation you use and we will confirm the equivalent in writing before quotation.

## Sources and notes

Approximate cross-reference only; systems grade by different principles. Supplied grade, D50 and distribution width are governed by the agreed technical documents. Standards referenced: GB/T 6406-2016, ISO 6106:2013, JB/T 7990-2012, FEPA (D-series micron), JIS B 4130.

## Download

[xintai-grit-size-chart-en.pdf](https://xtdiamond.com/media/2026/11/01M6TPVTD8MR8C927K2F7NM5VD-91fbacac8c32.pdf)

Format: application/pdf