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| 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 | ||||
| 5305-00-151-0390 (5305001510390) | 5305-00-162-0212 (5305001620212) | 5330-01-021-6193 (5330010216193) | 5306-01-667-2305 (5306016672305) | |
| 5305-00-702-7578 (5305007027578) | 5306-01-467-0619 (5306014670619) | 5340-14-507-0973 (5340145070973) | 5330-01-545-5049 (5330015455049) | |
| 5331-01-433-9967 (5331014339967) | 5330-01-176-0563 (5330011760563) | 5330-20-001-0516 (5330200010516) | 5305-00-550-9932 (5305005509932) | |
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