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National Stock Number:
5306-00-285-9408
Federal Supply Class:
5306
National Item Identification Number:
002859408
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:
| 3M261-4-13 | 76301 | THE BOEING COMPANY | | 66051-4-13 | 50394 | SPS TECHNOLOGIES INC UNBRAKO DIV | | AIC261M4-13 | 06725 | SPS TECHNOLOGIES, LLC |
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Techincal Specification:
| FASTENER LENGTH | 1.193 INCHES MINIMUM AND 1.240 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 0.802 INCHES MINIMUM AND 0.822 INCHES MAXIMUM | | HEAD HEIGHT | 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM | | HEAD STYLE | DOUBLE HEXAGON | | MATERIAL | STEEL OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | PS13145,FSCM 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) | | THREAD QUANTITY PER INCH | 28 |
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