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National Stock Number:
5306-01-039-8499
Federal Supply Class:
5306
National Item Identification Number:
010398499
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:
| B492329 | 71338 | NORTH BRIDGE FASTENERS INC | | B492329 | K0378 | ROLLS-ROYCE PLC | | B492329 | K0680 | ROLLS-ROYCE AIRLINES |
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Techincal Specification:
| DISTANCE FROM CENTERLINE TO FLAT | 0.205 INCHES MINIMUM AND 0.210 INCHES MAXIMUM | | FASTENER LENGTH | 1.200 INCHES NOMINAL | | GRIP DIAMETER | 0.2489 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 0.538 INCHES MINIMUM AND 0.620 INCHES MAXIMUM | | HEAD HEIGHT | 0.150 INCHES NOMINAL | | HEAD DIAMETER | 1.080 INCHES NOMINAL | | HEAD STYLE | DEE CHAMFER | | MATERIAL | STEEL CORROSION RESISTING OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | HEAD OUT OF ROUND | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | SURFACE FINISH | 32.0 MICROINCHES THREADS | | SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.580 INCHES MINIMUM AND 0.662 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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