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		                        | National Stock Number:
 5340-00-197-0400
 
 Federal Supply Class:
 5340
 
 National Item Identification Number:
 001970400
 
 Description:
 PLUG,EXPANSION
 
 Detail:
 A relatively thin metallic item, having a concave or cupped contour, designed to effect its own seal by compression against the circumference of a hole. It is used as a blowout plug in boilers, engines, and the like to relieve the pressure created by the expansion of fluids caused by heat or freezing.
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 Techincal Specification:
 
 | OUTSIDE DIAMETER | 0.688 INCHES NOMINAL |  | MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE |  | MATERIAL THICKNESS | 0.083 INCHES NOMINAL |  | MATERIAL | STEEL COMP 1010 |  | RADIUS | 1.156 INCHES NOMINAL |  | STYLE DESIGNATOR | CONCAVE | 
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