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National Stock Number:
5306-01-125-1999
Federal Supply Class:
5306
National Item Identification Number:
011251999
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:
| SS5115-4-21 | 56878 | SPS TECHNOLOGIES, LLC | | SS5115-4-21 | 78286 | SIKORSKY AIRCRAFT CORPORATION | | SS5115-4-21 | 80539 | SPS TECHNOLOGIES, LLC |
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Techincal Specification:
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.672 INCHES MINIMUM AND 1.702 INCHES MAXIMUM ALL HOLES | | FASTENER LENGTH | 1.757 INCHES MINIMUM AND 1.777 INCHES MAXIMUM | | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 1.312 INCHES MINIMUM AND 1.328 INCHES MAXIMUM | | HEAD HEIGHT | 0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM | | HEAD STYLE | DISHED HEXAGON | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL COMP XM-13 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM ALL HOLES | | SPECIAL FEATURES | WITH RETAINING ELEMENT ON SHANK,TWO HOLES SPACED NINETY DEGREES APART | | SURFACE FINISH | 32.0 MICROINCHES THREADS | | SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD | | SURFACE FINISH | 63.0 MICROINCHES GRIP | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.429 INCHES MINIMUM AND 0.465 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNJF | | WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
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