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National Stock Number:
5306-01-271-2522
Federal Supply Class:
5306
National Item Identification Number:
012712522
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:
| MS27576-3-27 | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE | | MS27576-3-27 | 96906 | MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.190 INCHES | | THREAD QUANTITY PER INCH | 32 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.266 INCHES MINIMUM AND | | 0.318 INCHES MAXIMUM | | FASTENER LENGTH | 2.060 INCHES MINIMUM AND | | 2.080 INCHES MAXIMUM | | MATERIAL | STEEL COMP 630 OR | | STEEL COMP 631 OR | | STEEL COMP 440C LOCKING FEATURE | | STEEL COMP E4340 OR | | STEEL COMP 8740 OR | | STEEL COMP 4140 OR | | STEEL COMP 4130 OR | | STEEL COMP 6150 FASTENER | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS5643 ASSN STD 1ST MATERIAL RESPONSE OR | | AMS5644 ASSN STD 2ND MATERIAL RESPONSE OR | | QQ-S-763 FED SPEC 2ND MATERIAL RESPONSE LOCKING FEATURE | | SURFACE TREATMENT | CADMIUM AND | | CHROMATE FASTENER | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY2 CL2 FED SPEC SINGLE TREATMENT RESPONSE FASTENER | | HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND | | 41.0 ROCKWELL C MAXIMUM FASTENER | | MINIMUM TENSILE STRENGTH | 95000 POUNDS PER SQUARE INCH | | HEAD STYLE | CROWNED HEXAGON | | HEAD HEIGHT | 0.095 INCHES MINIMUM AND | | 0.110 INCHES MAXIMUM | | WIDTH BETWEEN FLATS | 0.367 INCHES MINIMUM AND | | 0.376 INCHES MAXIMUM | | LOCKING FEATURE | DETENT RING GRIP | | GRIP LENGTH | 1.688 INCHES MINIMUM AND | | 1.704 INCHES MAXIMUM | | GRIP DIAMETER | 0.1885 INCHES MINIMUM AND | | 0.1894 INCHES MAXIMUM | | SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD | | 63.0 MICROINCHES GRIP | | DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.967 INCHES MINIMUM AND | | 1.997 INCHES MAXIMUM FIRST HOLE | | SHANK UNTHREADED HOLE DIAMETER | 0.070 INCHES MINIMUM AND | | 0.080 INCHES MAXIMUM FIRST HOLE |
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