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		                        | National Stock Number:
 4820-01-225-5539
 
 Federal Supply Class:
 4820
 
 National Item Identification Number:
 012255539
 
 Description:
 DISK,RUPTURABLE
 
 Detail:
 A THIN, CIRCULAR, METALLIC OR NONMETALLIC ITEM WITH A FLAT OR PREBULGED CROSS-SECTIONAL SHAPE, DESIGNED TO RUPTURE AT A PREDETERMINED PRESSURE TO PREVENT DAMAGE TO HYDRAULIC OR PNEUMATIC SYSTEMS, OR THE LIKE. IT MAY INCLUDE MULTIPLE PIECES, SUCH AS A RETAINER RING, DISK AND VACUUM SUPPORT. IT CAN BE USED INDEPENDENTLY OR AS A COMPONENT PART OF A HEAD, SAFETY, PRESSURE RELIEF. FOR ITEMS FURNISHED WITH A HOLDER, SEE HEAD AND DISK, SAFETY, PRESSURE RELIEF. FOR ITEMS WITHOUT A RUPTURE PRESSURE RATING, SEE DISK, SOLID, PLAIN. EXCLUDES DIAPHRAGM, VALVE, FLAT; DIAPHRAGM, VALVE, SPECIAL SHAPED; DISK, VALVE; AND INSULATOR, DISK.
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 Manufacturer Information:
 
 | 800015 | 16827 | B/E AEROSPACE, INC. |  | 800015 | 53655 | AVOX SYSTEMS INC | 
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 Techincal Specification:
 
 | DISK SIZE | 0.490 INCHES |  | BURST PRESSURE | 3000.0 PRESSURE POUNDS PER SQUARE INCH GAGE |  | CROSS-SECTIONAL SHAPE | CONCAVE |  | PROPRIETARY CHARACTERISTICS | PACS |  | SPECIAL FEATURES | THICKNESS:0.050 IN.NOM | 
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