|  | 
                            
                                |   | 
		                    
		                        | National Stock Number:
 5305-01-030-0551
 
 Federal Supply Class:
 5305
 
 National Item Identification Number:
 010300551
 
 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:
 
 | 317207-C-587 | 44114 | BAE SYSTEMS LAND & ARMAMENTS L.P. |  | 3176207-C-587 | 10001 | NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER |  | 3176207-C-587 | 53711 | NAVAL SEA SYSTEMS COMMAND |  | 5305PL1252446 | 9009H | INSPEKTORAT WSPARCIA SIL ZBROJNYCH | 
 | 
				            
					            | 
 Techincal Specification:
 
 | THREAD SERIES DESIGNATOR | UNC |  | NOMINAL THREAD DIAMETER | 0.250 INCHES |  | THREAD QUANTITY PER INCH | 20 |  | THREAD CLASS | 3A |  | THREAD DIRECTION | RIGHT-HAND |  | THREAD LENGTH | 0.525 INCHES MINIMUM AND |  |  | 0.625 INCHES MAXIMUM |  | FASTENER LENGTH | 0.625 INCHES NOMINAL |  | MATERIAL | PLASTIC LOCKING FEATURE |  |  | STEEL COMP 302 OR |  |  | STEEL COMP 304 OR |  |  | STEEL COMP 305 OR |  |  | STEEL COMP 316 OR |  |  | STEEL COMP 384 FASTENER |  | SURFACE TREATMENT | PASSIVATE FASTENER |  | HARDNESS RATING | 80.0 ROCKWELL B MINIMUM OVERALL |  | MINIMUM TENSILE STRENGTH | 80000 POUNDS PER SQUARE INCH |  | HEAD STYLE | FLAT CHAMFER |  | HEAD DIAMETER | 0.365 INCHES MINIMUM AND |  |  | 0.375 INCHES MAXIMUM |  | HEAD HEIGHT | 0.244 INCHES MINIMUM AND |  |  | 0.250 INCHES MAXIMUM |  | INTERNAL DRIVE STYLE | HEXAGON |  | WIDTH ACROSS FLATS | 0.188 INCHES NOMINAL |  | LOCKING FEATURE | PATCH OR |  |  | PELLET OR |  |  | STRIP THREADS | 
 |