# Hammers for mills

URL: https://moinhosvieira.com.br/en/hammers-for-mills/  
Updated on: 2026-11-04  
Other languages: Español: https://moinhosvieira.com.br/es/martillos-para-molinos/ · Português: https://moinhosvieira.com.br/martelos-para-moinhos/

> Moinhos Vieira manufactures hammers for any model of hammer mill, including mills from other manufacturers. The hammers undergo chemical analysis of the steel, metallography on each batch and Rockwell hardness (HRC) tests; quality is verified through a partnership with SGS do Brasil.

Materials: Special steels

| Model | Series | Number of hammers |
| --- | --- | --- |
| MCS 280 | MCS Series | 30 |
| MCS 350 | MCS Series | 30 |
| MCD 530 | MCD Series | 54 |
| MCD 680B | MCD Series | 54 |
| MCD 680A | MCD Series | 72 |
| MCD 950 | MCD Series | 96 |

Hammers for mills are metal parts that, when attached to a grinding rotor, enable the desired product to be broken down and micronized.

It is one of the most important spare parts for those who work with hammer mills, as hammer mill grinding is widely used in the human food industry, cosmetics and pharmaceutical industries, as well as pet food companies that work with animal feed. They are very cost-effective and easy to install.

The mills manufactured by Moinhos Vieira use grinding hammers throughout their range of equipment. Depending on the application, these hammers can be made from special steels or even undergo various heat treatments for greater durability against abrasive wear, thus enabling a longer service life for this spare part.

Moinhos Vieira also manufactures hammers for other manufacturers’ mills in a wide range of sizes. In addition to having a laboratory with a WPM Durometer, today we are able to determine the different degrees of HRC hardness through specific analyses and standardize the batches sent to our customers.

Through a partnership with SGS do Brasil, a world leader in inspection, verification, testing and certification, Moinhos Vieira is able to assess the quality of the hammer and guarantee a quality standard in the manufacture of these third-party hammers, maintaining or even improving the characteristics of these parts, due to the excellent analyses carried out.

## Frequently asked questions

### When should I turn the hammers and when should I replace them?

Turn the hammers when the mill's output drops: turning them changes the working edge of each hammer and does not require new pins or spacers. When the hammers are worn out, replace them with a new set.

### Why are replacement hammers supplied weighed in pairs?

To keep the rotor balanced. The hammers work in opposite sets on the rotor, and pairs of the same weight prevent imbalance and vibration.

### How often should the rotor pins and spacers be replaced?

Every 5 hammer replacements. They do not need to be replaced when you only turn the hammers. More in the [rotor pins guide](https://moinhosvieira.com.br/en/video-about-rotor-pins/).

### What should I do if the mill vibrates after a hammer change?

The likely cause is imbalance: check that the pairs of hammers, pins and spacers have the same weight. If strong vibration starts right after replacing or turning the hammers, switch the mill off and call technical assistance. More causes in the [troubleshooting guide](https://moinhosvieira.com.br/en/hammer-mill-troubleshooting/).

### Do worn hammers reduce output?

Yes. Worn hammers are among the most common causes of lost output and of the mill choking, together with a worn or clogged screen. Turning or replacing the hammers restores performance.

### How many hammers does each Vieira mill have?

According to each model's specifications:

- **MCS 280 and MCS 350**: 30 hammers
- **MCD 530 and MCD 680B**: 54 hammers
- **MCD 680A**: 72 hammers
- **MCD 950**: 96 hammers
See all the data on [our mills](https://moinhosvieira.com.br/en/our-mills/).

### Do you make hammers for other manufacturers' mills?

Yes. We make hammers for any hammer mill model, including mills from other manufacturers. Fill in the dimensions of the technical drawing on this page and send them on WhatsApp for a quote.