| Item Name | Seat Helical Compression Spring |
| Federal Supply Group (FSG) | Hardware and Abrasives |
| Federal Supply Class (FSC) | 5340 Hardware Commercial |
| National Item Identification Number (NIIN) | 00-178-0939 (001780939) |
| NCB Code | USA (00) |
| Manufacturer | Eaton Aerospace Ltd |
| MRC | Criteria | Characteristic |
|---|---|---|
| ABKW | OVERALL HEIGHT | 0.2850 INCHES MINIMUM AND 0.2870 INCHES MAXIMUM |
| ABPR | FIRST STEP DIAMETER | 0.8910 INCHES MINIMUM AND 0.8950 INCHES MAXIMUM |
| ALME | MATERIAL HARDNESS RATING | 40.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM |
| APGF | DESIGN TYPE | SOLID |
| BBRB | END DIAMETER | 0.3280 INCHES MINIMUM AND 0.3330 INCHES MAXIMUM |
| BZDH | DISTANCE FROM END TO FIRST STEP | 0.2200 INCHES MINIMUM AND 0.2270 INCHES MAXIMUM |
| MATT | MATERIAL | STEEL,QQ-S-624,COMPOSITION 4150 |
| ZZZV | FSC APPLICATION DATA | STARTER,ENGINE,HYDRAULIC |
| Relevant Components for NSN - 5340-00-178-0939, 5340001780939 | ||||
| 5320-01-093-5687 (5320010935687) | 5340-00-286-8500 (5340002868500) | 5310-00-797-4430 (5310007974430) | 5331-01-548-6940 (5331015486940) | |
| 5340-01-389-2408 (5340013892408) | 5340-01-499-3481 (5340014993481) | 5310-01-418-9739 (5310014189739) | 5320-01-419-8697 (5320014198697) | |
| 5340-01-681-6722 (5340016816722) | 5340-01-620-4639 (5340016204639) | 5340-01-481-2087 (5340014812087) | 5331-01-097-0869 (5331010970869) | |
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