5306-00-121-8844 BOLT,CLOSE TOLERANCE Index 5306-00-121-8846 BOLT,CLOSE TOLERANCE

National Stock Number:
5306-00-121-8845

Federal Supply Class:
5306

National Item Identification Number:
001218845

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:
06467-4-1417291MINIMATIC COMPONENTS
AS194-4-1484256AVIBANK MFG., INC.
AS194-4-14R1120SATAIR A/S
CA4510-4-1429372HOWMET GLOBAL FASTENING SYSTEMS INC.
MS27576-4-1480205NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE
MS27576-4-1496906MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
MS27576-4-14R80205NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE


Techincal Specification:
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER1.193 INCHES MINIMUM AND 1.223 INCHES MAXIMUM FIRST HOLE
FASTENER LENGTH1.293 INCHES MINIMUM AND 1.313 INCHES MAXIMUM
GRIP DIAMETER0.2483 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM
GRIP LENGTH0.875 INCHES MINIMUM AND 0.891 INCHES MAXIMUM
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM OVERALL
HEAD HEIGHT0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM
HEAD STYLEDISHED HEXAGON
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-83050 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES
SHANK UNTHREADED HOLE DIAMETER0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE
SPECIAL FEATURESW/RETAINING ELEMENT ON SHANK
WIDTH BETWEEN FLATS0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM
SURFACE FINISH63.0 MICROINCHES BEARING SURFACE OF HEAD
SURFACE FINISH63.0 MICROINCHES GRIP
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 2 FED SPEC ALL TREATMENT RESPONSES OVERALL
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.282 INCHES MINIMUM AND 0.333 INCHES MAXIMUM
THREAD QUANTITY PER INCH28
THREAD SERIES DESIGNATORUNJF


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