We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
White cylindrical filter element with textured sponge media and metal end caps

SPEEDAIRE

SPEEDAIRE 4ZK21 coalescing filter element 0.01 micron

SKU CH-70QF-2BNKF

Removes oil and water aerosols from compressed air down to 0.01 micron with microglass media

  • Removes oil aerosols down to 0.01 micron rating
  • Microglass media traps sub-micron particles for clean air
  • Miniature series fits compact filter housings
  • Weighs only 0.017 kg for easy handling
  • Compatible with Grainger 4ZL16 and 4ZL17 housings

SPEEDAIRE 4ZK21 Coalescing Filter

The SPEEDAIRE 4ZK21 is a coalescing filter element rated at 0.01 micron for compressed air systems. It uses a microglass sponge media to remove fine oil aerosols and solid particles from the air stream. This component fits miniature series filter housings used in pneumatic tool supply lines. It is intended for maintenance technicians and plant operators servicing existing air preparation equipment.

Installation and Common Issues

The element installs by opening the filter bowl, removing the used cartridge, and seating the new unit against the housing seal. A frequent issue is cross-threading the bowl during reassembly, which causes air leaks under pressure. Another common error is neglecting to lubricate the bowl O-ring, leading to seal deformation. Always depressurise the line fully before starting the swap to avoid sudden component ejection.

0.01 Micron Rating Decides Fit

The 0.01 micron rating determines whether this element meets your air purity class requirement for oil removal. If your application demands a coarser particulate rating or a different media type, this filter will not satisfy the specification. Verify the housing part number against compatible references 4ZL16 and 4ZL17 before ordering. Buyers needing a different micron rating or thread size should select an alternative element.

Highlights

  • Removes oil aerosols down to 0.01 micron rating
  • Microglass media traps sub-micron particles for clean air
  • Miniature series fits compact filter housings
  • Weighs only 0.017 kg for easy handling
  • Compatible with Grainger 4ZL16 and 4ZL17 housings

Specifications

BrandSPEEDAIRE

Questions about this item

How can I confirm the 0.01 micron filter is working after installation?

Monitor downstream air quality for oil aerosol reduction and watch for pressure drop across the element; a steady reading indicates the microglass media is coalescing correctly.

What comes with the 4ZK21 element and what must I source separately?

The box contains only the 0.017 kg coalescing filter element; you will need a compatible miniature-series housing such as Grainger 4ZL16 or 4ZL17.

Which SPEEDAIRE coalescing element should I choose for my miniature filter housing?

Select the 4ZK21 when your system requires 0.01 micron filtration for compressed air; verify the housing matches Grainger 4ZL16 or 4ZL17 before ordering.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.