SCREW
P/N NAS514P428-34
NSN 5305 01 122 5458
MFG NATIONAL AEROBASE STANDARDS
 
NEW GOV SRUPLUS
SUPPLIER CAGE CODE 03EF7
 
ITEM NAME   SCREW,MACHINE
DEFINITION  An externally threaded fastener whose threaded portion is of one
             nominal diameter, No 0 (0.060 in./1.5 mm) or larger, designed to be
             held or driven with either a wrench or an inserted driver or both
             (excluding internal socket or internal multiple spline types), in
             sizes below No. 10 (0.190 in./5 mm). No. 10 and larger sizes must have
             a head designed for any type inserted driver (excluding internal
             socket or internal multiple spline types), but may also be designed
             for external wrenching. A locking feature may be incorporated in the
             design of the head or threads. Excludes BOLT, CLEVIS; BOLT, EXTERNALLY
             RELIEVED BODY; SCREW, EXTERNALLY RELIEVED BODY; and SCREW, ASSEMBLED
             WASHER. See also, SCREW, INSTRUMENT; BOLT, MACHINE; BOLT, INTERNAL
             WRENCHING; and SCREW, CAP SOCKET HEAD.
            
 
CHARACTERISTIC                          VALUE
THREAD CLASS                            3A                                               
THREAD DIRECTION                        RIGHT-HAND                                       
THREAD LENGTH                           1.948 INCHES MINIMUM AND 2.125 INCHES MAXIMUM    
FASTENER LENGTH                         2.125 INCHES NOMINAL                             
HEAD STYLE                              FLAT COUNTERSUNK                                  
HEAD DIAMETER                           0.447 INCHES MINIMUM AND 0.507 INCHES MAXIMUM    
INTERNAL DRIVE STYLE                    CROSS RECESS TYPE 1                              
NOMINAL THREAD DIAMETER                 0.250 INCHES                                      
THREAD QUANTITY PER INCH                28                                               
MINIMUM TENSILE STRENGTH                125000 POUNDS PER SQUARE INCH                    
HARDNESS RATING                         26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C      
                                        MAXIMUM                                          
COUNTERSINK ANGLE                       99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM   
SCREW MATERIAL                          STEEL COMP 4037 OR STEEL COMP 8630               
SCREW SURFACE TREATMENT                 CADMIUM                                          
SCREW SURFACE TREATMENT                 QQ-P-416,TYPE 1,CLASS 2 FED SPEC SINGLE TREATMENT
DOCUMENT AND CLASSIFICATION             RESPONSE                                         
THREAD SERIES DESIGNATOR                UNJF                                             
SPECIFICATION/STANDARD DATA             80205-NAS514 PROFESSIONAL/INDUSTRIAL ASSOCIATION 
                                        STANDARD