SCREW
P/N BACB30LU3-11
PN BACB30LU-11
NSN 5305 01 101 9436
MFG ALCOA GLOBAL FASTENERS
 
NW 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                           0.320 INCHES MINIMUM AND 0.370 INCHES MAXIMUM    
FASTENER LENGTH                         1.018 INCHES MINIMUM AND 1.048 INCHES MAXIMUM    
HEAD STYLE                              FLAT COUNTERSUNK                                 
HEAD DIAMETER                           0.337 INCHES MINIMUM AND 0.383 INCHES MAXIMUM    
GRIP DIAMETER                           0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM  
INTERNAL DRIVE STYLE                    CROSS RECESS TYPE 1                              
NOMINAL THREAD DIAMETER                 0.190 INCHES                                     
GRIP LENGTH                             0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM    
THREAD QUANTITY PER INCH                32                                               
COUNTERSINK ANGLE                       99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM   
SURFACE FINISH                          32.0 MICROINCHES GRIP 32.0 MICROINCHES THREADS   
MATERIAL                                STEEL COMP 4340 OR STEEL COMP 8740 OVERALL       
MATERIAL DOCUMENT AND                   MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR     
CLASSIFICATION                          MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR AMS 
                                        6322 ASSN STD 2ND MATERIAL RESPONSE OVERALL      
SURFACE TREATMENT                       CADMIUM AND CHROMATE OVERALL                     
SURFACE TREATMENT DOCUMENT              QQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT     
AND CLASSIFICATION                      RESPONSE OVERALL                                 
THREAD SERIES DESIGNATOR                UNJF