SCREW
P/N NAS334CP30-5
NSN 5305 01 360 7873
MFG NATIONAL AEROSPACE STANDARDS
 
NEW GOV SURPLUS
SUPPLIER CAGE CODE 03EF7
 
ITEM NAME:   SCREW,CLOSE TOLERAN
DEFINITION:  A SCREW, MACHINE or SCREW, CAP, SOCKET HEAD whose unthreaded portion
             is of specified grip length, plated or unplated, and is machined to a
             tolerance of one thousandth (0.001 IN.) (0.025 mm) or less of a
             specific diameter for items (1.000 IN.) (25 mm) or less in diameter.
             Items over (1.000 IN.) (25 mm) in diameter shall have a tolerance of
             fifteen ten thousandths (0.0015 IN.) (0.038 mm) or less. The nominal
             major diameter of the threads shall be at least one thousandth (0.001
             IN.) (0.025 mm) below the minimum shank diameter, but not below the
             minimum major diameter for applicable class of fit, as shown in the
             Screw Thread Standards, FED STD H28 and/or other nationally recognized
             standards. The head is designed to be held or driven with an inserted
             driver. It is not designed for rotation by the thumb and fingers. A
             locking feature may be incorporated in the design of the head or
             threads.
            
 
CHARACTERISTIC                          VALUE
THREAD CLASS                            3A                                                
THREAD DIRECTION                        RIGHT-HAND                                       
THREAD LENGTH                           0.469 INCHES NOMINAL                             
FASTENER LENGTH                         3.077 INCHES MINIMUM AND 3.124 INCHES MAXIMUM    
HEAD STYLE                              FLAT COUNTERSUNK                                 
HEAD DIAMETER                           0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM    
GRIP DIAMETER                           0.2483 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM  
SHANK UNTHREADED HOLE                   0.076 INCHES NOMINAL FIRST HOLE                  
DIAMETER                                                                                 
INTERNAL DRIVE STYLE                    CROSS RECESS TYPE II                             
NOMINAL THREAD DIAMETER                 0.250 INCHES                                     
GRIP LENGTH                             2.687 INCHES NOMINAL                             
THREAD QUANTITY PER INCH                28                                               
MINIMUM TENSILE STRENGTH                160000 POUNDS PER SQUARE INCH                    
HARDNESS RATING                         36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C      
                                        MAXIMUM OVERALL                                  
COUNTERSINK ANGLE                       99.0 DEGREES MINIMUM                             
DISTANCE FROM HEAD LARGEST              2.999 INCHES NOMINAL FIRST HOLE                  
BEARING SURFACE TO SHANK                                                                 
HOLE CENTER                                                                              
SURFACE FINISH                          32.0 MICROINCHES GRIP 32.0 MICROINCHES THREADS   
MATERIAL                                STEEL COMP 4140 OR STEEL COMP 4340 OR STEEL COMP 
                                        8740 OVERALL                                     
MATERIAL DOCUMENT AND                   MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR     
CLASSIFICATION                          MIL-S-8844 MIL SPEC 2ND MATERIAL RESPONSE OR     
                                        AMS6414 ASSN STD 2ND MATERIAL RESPONSE OR        
                                        MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OVERALL
SURFACE TREATMENT                       CADMIUM AND CHROMATE OVERALL                     
SURFACE TREATMENT DOCUMENT              QQ-P-416 TY2 CL2 FED SPEC SINGLE TREATMENT       
AND CLASSIFICATION                      RESPONSE OVERALL                                 
THREAD SERIES DESIGNATOR                UNJF                                             
SPECIFICATION/STANDARD DATA             80205-NAS334 PROFESSIONAL/INDUSTRIAL ASSOCIATION 
                                        STANDARD