| THREAD SERIES DESIGNATOR | UNC | 
| NOMINAL THREAD DIAMETER | 0.138 INCHES | 
| THREAD QUANTITY PER INCH | 32 | 
| THREAD CLASS | 2A | 
| THREAD DIRECTION | RIGHT-HAND | 
| THREAD LENGTH | 0.375 INCHES MINIMUM | 
| FASTENER LENGTH | 3.245 INCHES MINIMUM AND | 
|  | 3.255 INCHES MAXIMUM | 
| MATERIAL | IRON ALLOY 660 OVERALL | 
| MATERIAL DOCUMENT AND CLASSIFICATION | AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | 
| HARDNESS RATING | 35.0 ROCKWELL C MINIMUM AND | 
|  | 39.0 ROCKWELL C MAXIMUM OVERALL | 
| MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH | 
| HEAD STYLE | HEXAGON | 
| HEAD HEIGHT | 0.190 INCHES NOMINAL | 
| WIDTH BETWEEN FLATS | 0.240 INCHES MINIMUM AND | 
|  | 0.252 INCHES MAXIMUM | 
| SHOULDER SHAPE | ROUND ALL SHOULDERS | 
| SHOULDER DIAMETER | 0.218 INCHES MINIMUM AND | 
|  | 0.226 INCHES MAXIMUM SECOND SHOULDER | 
|  | 0.218 INCHES MINIMUM AND | 
|  | 0.226 INCHES MAXIMUM FOURTH HOLE | 
| SHOULDER LENGTH | 0.134 INCHES MINIMUM AND | 
|  | 0.138 INCHES MAXIMUM SECOND SHOULDER | 
|  | 0.350 INCHES NOMINAL FOURTH HOLE | 
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 3.115 INCHES MINIMUM AND | 
|  | 3.125 INCHES MAXIMUM FIRST HOLE | 
| THE MANUFACTURERS DATA |  | 
| MANUFACTURERS CODE | 82577 | 
| DESIGN CONTROL REFERENCE | 3797183 |