5306-01-309-4337 BOLT,EXTERNALLY RELIEVED BODY Index 5331-01-309-4339 O-RING

National Stock Number:
5306-01-309-4338

Federal Supply Class:
5306

National Item Identification Number:
013094338

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:
MS27576-6-3280205NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE
MS27576-6-3296906MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
NASM27576-6-3280205NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE


Techincal Specification:
THREAD SERIES DESIGNATORUNJF
NOMINAL THREAD DIAMETER0.375 INCHES
THREAD QUANTITY PER INCH24
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.523 INCHES MINIMUM AND
0.559 INCHES MAXIMUM
FASTENER LENGTH2.539 INCHES MINIMUM AND
2.559 INCHES MAXIMUM
MATERIALSTEEL COMP 630 OR
STEEL COMP 631 OR
STEEL COMP 440C LOCKING FEATURE
STEEL COMP E4340 OR
STEEL COMP 4140 OR
STEEL COMP 8740 OR
STEEL COMP 4130 OR
STEEL COMP 6150 FASTENER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR
AMS 5644 ASSN STD 2ND MATERIAL RESPONSE OR
QQ-S-763 FED SPEC 3RD MATERIAL RESPONSE LOCKING FEATURE
MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR
MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OR
MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OR
MIL-S-6758 MIL SPEC 4TH MATERIAL RESPONSE OR
MIL-S-8503 MIL SPEC 5TH MATERIAL RESPONSE FASTENER
SURFACE TREATMENTCADMIUM AND
CHROMATE FASTENER
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE FASTENER
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND
41.0 ROCKWELL C MAXIMUM OVERALL
MINIMUM TENSILE STRENGTH95000 POUNDS PER SQUARE INCH
HEAD STYLECROWNED HEXAGON
HEAD HEIGHT0.189 INCHES MINIMUM AND
0.204 INCHES MAXIMUM
WIDTH BETWEEN FLATS0.553 INCHES MINIMUM AND
0.564 INCHES MAXIMUM
LOCKING FEATURERETAINER GRIP
GRIP LENGTH2.000 INCHES MINIMUM AND
2.016 INCHES MAXIMUM
GRIP DIAMETER0.3733 INCHES MINIMUM AND
0.3742 INCHES MAXIMUM
SURFACE FINISH63.0 MICROINCHES BEARING SURFACE OF HEAD
63.0 MICROINCHES GRIP
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER2.424 INCHES MINIMUM AND
2.454 INCHES MAXIMUM FIRST HOLE
SHANK UNTHREADED HOLE DIAMETER0.106 INCHES MINIMUM AND
0.116 INCHES MAXIMUM FIRST HOLE


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