SCREW
PN NAS1351-C4-20
PN AIC811-4-20
PN AOL4166-419
PN 10125070
PM 73573-4-20C
PN 965811-418C
NSN 5305-00-235-9883
MFG NATIONAL AEROSPACE STANDARDS
 
NEW GOV SURPLUS
SUPPLIER CAGE CODE 0E3F7
 
ITEM NAME:   SCREW,CAP,SOCKET HE
DEFINITION:  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.
            
 
CHARACTERISTIC                          VALUE
THREAD CLASS                            3A                                               
THREAD DIRECTION                        RIGHT-HAND                                       
THREAD LENGTH                           1.210 INCHES MINIMUM AND 1.250 INCHES MAXIMUM    
FASTENER LENGTH                         1.234 INCHES MINIMUM AND 1.281 INCHES MAXIMUM    
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                                           
NOMINAL THREAD DIAMETER                 0.250 INCHES                                     
WIDTH ACROSS FLATS                      0.188 INCHES MINIMUM AND 0.190 INCHES MAXIMUM    
THREAD QUANTITY PER INCH                28                                                
MINIMUM TENSILE STRENGTH                80000 POUNDS PER SQUARE INCH                     
HARDNESS RATING                         80.0 ROCKWELL B MINIMUM OVERALL                  
MINIMUM YIELD STRENGTH                  30000 POUNDS PER SQUARE INCH                     
MATERIAL                                STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 305
                                        OR STEEL COMP 316 OR STEEL COMP 384 OR STEEL COMP
                                        XM-7 OVERALL                                     
MATERIAL DOCUMENT AND                   66 FED STD 1ST MATERIAL RESPONSE OR 66 FED STD 2ND
CLASSIFICATION                          MATERIAL RESPONSE OR 66 FED STD 3RD MATERIAL     
                                        RESPONSE OR 66 FED STD 4TH MATERIAL RESPONSE OR 66
                                        FED STD 5TH MATERIAL RESPONSE OR ASTM A493 ASSN  
                                        STD 6TH MATERIAL RESPONSE OVERALL                
SURFACE TREATMENT                       PASSIVATE OVERALL                                
SURFACE TREATMENT DOCUMENT              QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
AND CLASSIFICATION                                                                        
THREAD SERIES DESIGNATOR                UNRF