5305-01-069-9273 SCREW,CAP,HEXAGON HEAD Index 5305-01-069-9277 SCREW,CLOSE TOLERANCE

National Stock Number:
5306-01-069-9275

Federal Supply Class:
5306

National Item Identification Number:
010699275

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.


Manufacturer Information:
BACB30BG5K20A81205THE BOEING COMPANY


Techincal Specification:
FASTENER LENGTH1.766 INCHES MINIMUM AND 1.796 INCHES MAXIMUM
GRIP DIAMETER0.3108 INCHES MINIMUM AND 0.3117 INCHES MAXIMUM
GRIP LENGTH1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM
HEAD HEIGHT0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM
HEAD STYLEHEXAGON
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-C-530 TEMPER A FED SPEC 1ST MATERIAL RESPONSE OR QQ-C-530 TEMPER A FED SPEC 2ND MATERIAL RESPONSE OR QQ-N-286 FED SPEC 3RD MATERIAL RESPONSE OVERALL
MATERIALCOPPER ALLOY 172 OR COPPER ALLOY 173 OR NICKEL ALLOY K-500 OVERALL
MINIMUM TENSILE STRENGTH140000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER0.312 INCHES
WIDTH BETWEEN FLATS0.490 INCHES MINIMUM AND 0.502 INCHES MAXIMUM
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD
SURFACE FINISH32.0 MICROINCHES GRIP
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 1 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.506 INCHES MINIMUM AND 0.556 INCHES MAXIMUM
THREAD QUANTITY PER INCH24
THREAD SERIES DESIGNATORUNF


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