| 
                                    
                                 | 
                             
                            
                                
                                     
                                 | 
                             
		                    
		                        
		                             National Stock Number: 5305-01-497-8533
  Federal Supply Class: 5305
  National Item Identification Number: 014978533
  Description: SCREW,CAP,SOCKET HEAD
  Detail: An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes items with bevel (conical) heads. See BOLT, INTERNAL WRENCHING. Excludes SCREW, SHOULDER; and SCREW, MACHINE. 
		                         | 
		                     
		                    
		                        
                                    
  Manufacturer Information:
 | 0.250-20UNRC-3A X 0.438LG NICUAL | 81349 | MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |  | 218039406 | 96169 | ELECTRIC BOAT CORPORATION |  | 596-7409351-18 | 53711 | NAVAL SEA SYSTEMS COMMAND |  | B541-1302-18 | 96169 | ELECTRIC BOAT CORPORATION |   
		                         | 
		                     
				            
					            
						            
  Techincal Specification:
 | FASTENER LENGTH | 0.438 INCHES NOMINAL |  | MATERIAL | NICKEL ALLOY OVERALL |  | PROPRIETARY CHARACTERISTICS | PACS |  | NOMINAL THREAD DIAMETER | 0.250 INCHES |  | SPECIAL FEATURES | TECH DATA NOT AUTHORIZED FOR RELEASE OUTSIDE OF U.S.; PART OF LDT TRANSFER MID RAILS ASSEMBLY OF SEAWOLF CLASS SUBMARINE, SSN 23 |  | THREAD CLASS | 3A |  | THREAD DIRECTION | RIGHT-HAND |  | THREAD QUANTITY PER INCH | 20 |  | THREAD SERIES DESIGNATOR | UNRC |   
					             | 
				             
		                 
		             |