NAS 1638 is an older standard developed in 1964 to define classes of contamination in aircraft components and hydraulic fluids. The classes refer to maximum number the particles in 100mL in different size classes. The table below shows the classification values that may still be in use for older specifications based on Hiac particle counters, but this standard officially became invalid in 2001. Most users use a single code number based on the highest particle count in any of the size bins.
| code | 5-15 µm | 15-25 µm | 25-50 µm | 50-100 µm | over 100 µm |
| 00 | 125 | 22 | 4 | 1 | 0 |
| 0 | 250 | 44 | 8 | 2 | 0 |
| 1 | 500 | 89 | 16 | 3 | 1 |
| 2 | 1000 | 178 | 32 | 6 | 1 |
| 3 | 2000 | 356 | 63 | 11 | 2 |
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| 5 | 8000 | 1425 | 253 | 45 | 8 |
| 6 | 16000 | 2850 | 506 | 90 | 16 |
| 7 | 32000 | 5700 | 1012 | 190 | 32 |
| 8 | 64000 | 11400 | 2025 | 360 | 64 |
| 9 | 128000 | 22800 | 4050 | 720 | 128 |
| 10 | 256000 | 45600 | 8100 | 1440 | 256 |
| 11 | 512000 | 91200 | 16200 | 2880 | 512 |
| 12 | 1024000 | 182400 | 32400 | 5760 | 1024 |
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Learn how the AccuSizer A2000CMS can automate your particulate contamination measurements and report directly in NAS 1638 format.
'Can you explain the NAS value in hydraulic and engine oils? Does it vary with a change in viscosity?'
The National Aerospace Standard (NAS) 1638 was developed in the 1960s to help control the contamination levels of hydraulic fluid within hydraulic components. NAS 1638 became a standard not only for the aerospace industry but also throughout many other industries as well. The latest version of NAS 1638 is SAE 4059.
Nevertheless, in many areas of industry, NAS 1638 has largely been outpaced by the ISO 4406 standard in recent years. Both NAS 1638 and ISO 4406 focus on the methods for calculating particle counts or solid contamination levels within a fluid.
The conversion from NAS 1638 cleanliness class specifications to AS4059 class specifications is defined. The comparison of the NAS 1638 classes to AS4059 classes and levels is provided and are defined and the differences explained (Appendix B). NAS 1638 classes based on weight of particles are not applicable to these classes and are not included.
NAS 1638 represents the counts of particles in five size groups:
- 5 to 15 microns per 100 milliliters (mL)
- 15 to 25 microns per 100 mL
- 25 to 50 microns per 100 mL
- 50 to 100 microns per 100 mL
- >100 microns per 100 mL
ISO 4406:1999 represents the counts of particles in three size groups:
Nas 1638 Pdf Document
- >4 microns per 1 mL
- >6 microns per 1 mL
- >14 microns per 1 mL
From these five groups of particle sizes and a basic particle size distribution, NAS 1638 reports the results in 14 distinct classes of particle counts numbered 00, 0 and 1 through 12, with 00 being the cleanest and 12 being the dirtiest. Each proceeding class contains twice the number of particles as the previous class per each of the five particle size groups (see the table below).
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NAS 1638 Contamination Classification System
Although the use of NAS 1638 has been decreasing through the years, it is still used in some areas of the world. The most recent update to the standard includes the following: 'Inactive for new designs after May 30, 2001, see AS4059C,' and 'This standard should not be used with automatic particle counting.'
AS4059C was put in place to overcome some insufficiencies with NAS 1638 related to the proper direction of the method application.
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ISO 4406 utilizes a new calibration method for automatic particle counters (APCs). This method reports particle counts in three code numbers with each number correlating to the count of particles larger than 4, 6 and 14 microns.
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Since NAS 1638 (as well as ISO 4406 and AS4059) is designed solely to measure particle counts in terms of size distribution, the effects of viscosity have no role in the reported values.