Nas 1638 Pdf
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 |
| 4 | 4000 | 712 | 126 | 22 | 4 |
| 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 |
Nas Class 6
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Nas 1638 Pdf Documents
NAS 1638 standard: NAS 1628 is a American standard that references the contamination load based on a breakdown of the different particle sizes for specific particle sizes: 5 to 15 micron, 15 to 25 micron, 25 to 50 micron, 50 to 100 micron, 100 micron. Click to download the NAS 1638 pdf file. Buy nas 1638: 0 cleanliness requirements of parts used in hydraulic systems from sai global. The NAS 1638 cleanliness standard was developed for aerospace components in the US and is still widely used for industrial and aerospace fluid power applications. The figures are differential counts, and the NAS class is usually reported as a single figure representing the maximum allowed particle counts (i.e. Worst case) for designated particle. 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. ISO 4406 versus NAS 1638 The recommended standard for defini-tion of oil cleanliness level is ISO 4406. If NAS 1638 is used, the number of par - ticles in a 100 ml sample larger than 6 and/or 14 microns must be within the range specified by the ISO 4406 code. Cleanliness level required for ME-System -ISO 4406 Code xx/16/13.