BOLT

PN AN177H25

NSN 5306 00 156 2926

MFG AERONAUTICAL STANDARDS 

NEW GOV SURPLUS

SUPPLIER CAGE COEE 03EF7

ITEM NAME:   BOLT,CLOSE TOLERANC
DEFINITION:  An externally threaded fastener whose unthreaded portion is of a
             specified grip length, plated or unplated, and is machined to a
             tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a
             specific diameter for items one inch (25 mm) or less in diameter.
             Items over one inch (25 mm) in diameter shall have a tolerance of
             fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The
             nominal major diameter of the threads shall be at least one thousandth
             (0.001) of an inch (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 not designed to be held
             or driven with an inserted driver, nor is it designed for rotation by
             the thumb and fingers. A locking feature may be incorporated in the
             design of the head or threads. For items having close tolerance, and
             fabricated from material having 160,000 pounds per square inch (1100
             megapascals) minimum tensile strength, see BOLT, SHEAR. For items
             fabricated from material having less than 160,000 pounds per square
             inch (1100 megapascals) minimum tensile strength and not having a
             close tolerance, see BOLT, MACHINE.
             

CHARACTERISTIC                          VALUE
THREAD CLASS                            3A                                                
THREAD DIRECTION                        RIGHT-HAND                                        
THREAD LENGTH                           0.657 INCHES MINIMUM                              
FASTENER LENGTH                         2.719 INCHES NOMINAL                              
HEAD STYLE                              HEXAGON                                           
HEAD HEIGHT                             0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM     
WIDTH BETWEEN FLATS                     0.615 INCHES MINIMUM AND 0.627 INCHES MAXIMUM     
HOLE DIAMETER                           0.070 INCHES NOMINAL                              
GRIP DIAMETER                           0.4362 INCHES MINIMUM AND 0.4367 INCHES MAXIMUM   
SHANK UNTHREADED HOLE                   0.106 INCHES MINIMUM FIRST HOLE                   
DIAMETER                                                                                  
NOMINAL THREAD DIAMETER                 0.437 INCHES                                      
GRIP LENGTH                             2.062 INCHES NOMINAL                              
HOLE QUANTITY                           1                                                 
HOLE TYPE                               DRILLED                                           
THREAD QUANTITY PER INCH                20                                                
MINIMUM TENSILE STRENGTH                125000 POUNDS PER SQUARE INCH                     
HARDNESS RATING                         26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C       
                                        MAXIMUM OVERALL                                   
HOLE CONFIGURATION STYLE                HEXAGON FLATS                                     
DISTANCE FROM HEAD LARGEST              2.546 INCHES NOMINAL FIRST HOLE                   
BEARING SURFACE TO SHANK                                                                  
HOLE CENTER                                                                               
SURFACE FINISH                          63.0 MICROINCHES BEARING SURFACE OF HEAD 63.0     
                                        MICROINCHES GRIP                                  
MATERIAL                                STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP  
                                        8735 OR STEEL COMP 4037 OR STEEL COMP 4130 OR     
                                        STEEL COMP 4140 OVERALL                           
SURFACE TREATMENT                       CADMIUM AND CHROMATE OVERALL                      
DEFINITIVE GOVERNMENT                   AN177H25                                          
SPEC/STD REFERENCE                                                                        
SPEC/STD CONTROLLING DATA               88044                                             
MANUFACTURERS CODE                                                                        
SURFACE TREATMENT DOCUMENT              QQ-P-416,TY2 CL3 FED SPEC SINGLE TREATMENT        
AND CLASSIFICATION                      RESPONSE OVERALL                                  
THREAD SERIES DESIGNATOR                UNF