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National Stock Number:
5306-01-179-0902
Federal Supply Class:
5306
National Item Identification Number:
011790902
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:
| HS5271-6-21 | 02731 | MCDONNELL DOUGLAS HELICOPTER CO INC | | HS6051-6-21 | 02731 | MCDONNELL DOUGLAS HELICOPTER CO INC | | HS6051-6-21 | 16258 | SPACE-LOK, INC. | | SLB361-6-21 | 16258 | SPACE-LOK, INC. | | HS6051-6-21 | 8V613 | THE BOEING COMPANY |
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Techincal Specification:
| FASTENER LENGTH | 2.312 INCHES NOMINAL | | GRIP DIAMETER | 0.343 INCHES MINIMUM AND 0.353 INCHES MAXIMUM | | GRIP LENGTH | 1.313 INCHES NOMINAL | | HEAD HEIGHT | 0.378 INCHES MINIMUM AND 0.398 INCHES MAXIMUM | | HEAD STYLE | DOUBLE HEXAGON | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS5514 ASSN STD SINGLE MATERIAL RESPONSE OR AMS6532 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL COMP 305 OVERALL | | MINIMUM TENSILE STRENGTH | 280000 POUNDS PER SQUARE INCH | | NOMINAL THREAD DIAMETER | 0.375 INCHES | | PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT, DOUBLE HEXAGON, TENSION, 280,000 PSI MINIMUM TENSTILE STRENGTH, 450 DEGRESS F | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-6887,TY2,CL2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | SPECIAL FEATURES | VACUUM CADMIUM PLATED;HEAT TREAT 280,000 PSI MINIMUM ULTIMATE TENSTILE STRENGTH, RC52 MINIMUM FOR MARAGING, RC53 MINIMUM FOR AERMET;MAGNETIC PARTICLE INSPECT 100 PERCENT PER ASTM E 1444;UNDRILLED HEAD;HEAD OF BOLT TO BE FORGED;THREAD SHALL BE ROLLED AFTER HEAT TREATMENT;FATIGUE, MINIMUM TENSION-TENSION FATIGUE LOADS, HIGH LOADS EQUALS 11,800 LBS, LOW LOAD EQUALS 1,180 LBS;HIGH FATIGUE STRENGTH BASED ON 48PERCENT OF MIN. TENSTILE STRENGTH AND 10 PERCENT OF HIGH TENSTILE STRENGTH | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 1.000 INCHES NOMINAL | | THREAD QUANTITY PER INCH | 24 | | THREAD SERIES DESIGNATOR | UNF | | WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
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