SCREW
P/N NAS335CPA11
NSN 5305 00 576 2828
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                           0.505 INCHES MINIMUM AND 0.572 INCHES MAXIMUM    

FASTENER LENGTH                         1.203 INCHES MINIMUM AND 1.250 INCHES MAXIMUM    

HEAD STYLE                              FLAT COUNTERSUNK                                 

HEAD DIAMETER                           0.625 INCHES MINIMUM AND 0.635 INCHES MAXIMUM    

GRIP DIAMETER                           0.3108 INCHES MINIMUM AND 0.3117 INCHES MAXIMUM  

INTERNAL DRIVE STYLE                    CROSS RECESS TYPE 1                              

NOMINAL THREAD DIAMETER                 0.312 INCHES                                     

GRIP LENGTH                             0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM    

THREAD QUANTITY PER INCH                24                                               

MINIMUM TENSILE STRENGTH                160000 POUNDS PER SQUARE INCH                    

HARDNESS RATING                         36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C      

                                        MAXIMUM OVERALL                                  

COUNTERSINK ANGLE                       100.0 DEGREES NOMINAL                            

MATERIAL                                STEEL OVERALL                                    

SURFACE TREATMENT                       CADMIUM OVERALL                                  

THREAD SERIES DESIGNATOR                UNJF