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National Stock Number:
5306-00-871-8772
Federal Supply Class:
5306
National Item Identification Number:
008718772
Description:
BOLT,CLOSE TOLERANCE
Detail:
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.
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Manufacturer Information:
| 74855 | 80254 | TEXTRON LYCOMING INC WILLIAMSPORT PLANT | | 74855 | R1120 | SATAIR A/S |
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Techincal Specification:
| DISTANCE FROM CENTERLINE TO FLAT | 0.240 INCHES NOMINAL | | FASTENER LENGTH | 0.870 INCHES NOMINAL | | GRIP LENGTH | 0.310 INCHES NOMINAL | | GRIP DIAMETER | 0.3745 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM | | HARDNESS RATING | 28.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL | | HEAD DIAMETER | 0.750 INCHES NOMINAL | | HEAD HEIGHT | 0.150 INCHES MINIMUM AND 0.165 INCHES MAXIMUM | | HEAD STYLE | DEE | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6320 ASSN STD 1ST MATERIAL RESPONSE OR AMS 6322 ASSN STD 2ND MATERIAL RESPONSE OR AMS 6415 ASSN STD 3RD MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL COMP 8735 OR STEEL COMP 8740 OR STEEL COMP 4340 OVERALL | | NOMINAL THREAD DIAMETER | 0.375 INCHES | | SPECIAL FEATURES | EXTENDED DIA ON THREADED END 0.368 IN.MIN AND 0.370 IN.MAX,0.150 IN.LG,DIA SHALL HAVE 2 FLATS 0.130 IN. | | THREAD CLASS | 3A | | THREAD LENGTH | 0.410 INCHES NOMINAL | | THREAD DIRECTION | RIGHT-HAND | | THREAD QUANTITY PER INCH | 24 | | THREAD SERIES DESIGNATOR | UNF |
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