SMC AF40-N04-Z-D Air Filter, AF-D Series, 1/2" NPT, 5 Micron, Polycarbonate Bowl

The SMC AF40-N04-Z-D is a size-40 modular air filter from SMC's current AF-D series, configured with a 1/2" NPT port, a nominal 5 micron element, and a polycarbonate bowl. It is a main-line filter for removing solid particulate and condensed moisture from compressed air ahead of regulators, lubricators, valves, and downstream pneumatics. This build ships without a bracket and uses a manual drain cock, with product labeling in imperial units (psi, degF).

Part Number Breakdown

Default positions for this configuration: without bracket, without auto drain, polycarbonate bowl, with drain cock, without element service indicator, flow direction left to right.

Specifications

Refer to the SMC AF20-D to AF60-D datasheet for the full flow-characteristic curve at the size-40 body.

AF-D Generation Features

• 2-layer bowl construction - the polycarbonate bowl is covered by a transparent bowl guard for improved impact and environmental resistance while retaining full 360 degree visibility of the bowl contents.
• Tool-free element service - the element can be replaced by hand, no tools required, reducing maintenance time.
• Reduced footprint - the thinner resin case increases bowl capacity (approximately 1.3 times) and reduces the maintenance space required around the unit.
• Modular interface - connects with other SMC D-series air preparation equipment (regulators, lubricators, mist separators) to build a compact F.R.L. stack.

Replacing AF40-N04-Z-A

SMC discontinued manufacture of the AF40-N04-Z-A (AF10-AF60-A series) in March 2025 and designates the AF20-AF40-D series as its replacement. For this port and configuration, the AF40-N04-Z-D is the direct successor and carries over the fit and function that specified the -A part:

• Same 1/2" NPT port and size-40 body
• Same 5 micron nominal filtration and polycarbonate bowl
• Same manual drain cock and left-to-right flow direction
• Same imperial (psi, degF) product labeling carried by the "Z" designation

Crossover notes: The AF-D generation restructured the option string, so several attributes the -A packed into its "Z" semi-standard code (flow direction, drain cock) are now default positions on the -D. The result for AF40-N04-Z-A is a clean, like-for-like move to AF40-N04-Z-D. The AF-D adds the 2-layer transparent bowl guard and tool-free element replacement described above. The AF40P-060S element used on the -A carries forward, so existing spares inventory remains valid.

If your application requires an automatic (N.O.) float drain instead of the manual cock, see the AF40-N04-2Z-D in the same series.

Maintenance Parts and Related Products

• Replacement filter element (5 micron): SMC AF40P-060S
• Auto-drain version of this filter: SMC AF40-N04-2Z-D
• Browse the full AF-D air filter series and SMC air preparation (FRL) range

Frequently Asked Questions

Is the AF40-N04-Z-D a direct replacement for the AF40-N04-Z-A?

Yes. SMC discontinued the AF40-N04-Z-A in March 2025 and lists the AF-D series as the replacement. The AF40-N04-Z-D matches the 1/2" NPT port, 5 micron polycarbonate-bowl build, manual drain, and imperial labeling of the -A part, so it is a like-for-like successor.

What is the filtration rating and which element does it use?

The AF40-N04-Z-D provides 5 micron nominal filtration and uses the AF40P-060S replacement element.

What port size and thread does it have?

1/2" NPT (the "N04" in the part number). It is built on the size-40 body.

Does it include a bracket or an automatic drain?

No. This configuration ships without a bracket and with a manual drain cock. If you need an automatic float drain, specify the AF40-N04-2Z-D.

What are the pressure and temperature limits?

Maximum operating pressure is 1.0 MPa (150 psi), proof pressure is 1.5 MPa, and the operating temperature range is -5 to 60 degC with no freezing.

Will it connect to my existing modular F.R.L. stack?

The AF-D uses SMC's D-series modular interface and connects with matching D-series regulators, lubricators, and separators. When mixing older A-series and current D-series bodies in one stack, confirm interface and spacer compatibility for that specific combination.