Metalworking Fluid Filters Information

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metalworking fluid filtersmetalworking fluid filtersmetalworking fluid filters

Filter bag. Filter membranes. Filter Cartridge

Image Credit: Eaton Filtration | Saint-Gobain Oil & Gas |   Hilliard Corp.


Metalworking fluid filters are industrial filtration products used in metal processing applications to improve machine performance, product quality, and equipment life (i.e., maintenance schedule, repairs). They are used with lathes, grinding machines, machining centers and many other types of machine tools and manufacturing and processing equipment.


Metalworking fluid filters are made of woven or non-woven materials, and are designed to filter emulsions, mists, micro-mist, smoke, and vapors from soluble oils, machine oils, mineral oils, and synthetic fluids. Applications include water filtration in the chemical processing, food processing, and glass manufacturing industries.


Metalworking Fluid Filters Specifications

Specifications for metalworking fluid filters include flow rate range, filtration level, and number of stages.

  • Flow rate - Typically, flow rate range is measured in liters per minute.
  • Filtration level - Filtration level is specified in microns. Machining oil, cutting fluid and coolant filters also vary in terms of number of stages, and may feature a modular design that allows integration with pre-filtration and post-filtration equipment.
  • Number of stages - In general, single-stage filters are smaller and less expensive than multi-stage filters. Often, single-stage products are used with devices such as air compressors and lathes. Double-stage filters are used in a two-step filtration process which removes magnetic particles from an industrial fluid, and then passes the liquid through a fabric filter. Pre-filtration stages for metalworking fluid filters can be either magnetic or fabric.

Types of Metalworking Fluid Filters 

There are many different types of metalworking fluid filters.

  • Machining oil filters include water, smoke, and oil (WSO) mist collectors; vertical and horizontal mist collectors; centrifugal mist collectors, oil mist eliminators, and hydraulic filters.
  • WSO filters are designed to remove water-soluble fluids, smoke from machining operations, and machine oil.
  • Vertical mist collectors are vertically-oriented machining oil, cutting fluid and coolant filters that are used in die casting, grinding, machining, and soldering applications.
  • Horizontal mist collectors are horizontally-oriented devices that are used in these same applications.
  • Centrifugal mist collectors are machine-mounted filtration products that are designed to reclaim machine oils or synthetic, semi-synthetic or water-based coolants.
  • Oil mist eliminators are designed to eliminate oil fumes and return used oil to vacuum pumps.

  • Hydraulic filters remove particulates from hydraulic fluids in order to minimize abrasive wear.


Metalworking fluid filters must adhere to standards to ensure proper design and functionality.


ASTM D2881 - This classification covers and is designed to standardize and consolidate the terminology, nomenclature, and classification of metalworking fluids and related materials.

ASTM E2148 - This guide covers information on how to use documents related to health and safety of metalworking and metal removal fluids. As such, this guide will provide the user with sufficient background information to effectively use the documents listed in Section 2. Documents referenced in this guide are grouped as applicable to producers, to users or to all.



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