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National Stock Number:
5306-01-393-1296
Federal Supply Class:
5306
National Item Identification Number:
013931296
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:
| 03A094-4-51 | 1W025 | NORTHROP GRUMMAN SYSTEMS CORP | | 03A094-4-51 | 76823 | NORTHROP GRUMMAN SYSTEMS CORPORATION | | SLB131-4-51 | 16258 | SPACE-LOK, INC. | | LB57-4-51 | 73197 | HI-SHEAR CORPORATION | | AS374-4-51 | 84256 | AVIBANK MFG., INC. | | LB57-4-51 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| FASTENER LENGTH | 3.693 INCHES MINIMUM AND 3.713 INCHES MAXIMUM | | GRIP DIAMETER | 0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM | | GRIP LENGTH | 3.188 INCHES MINIMUM AND 3.203 INCHES MAXIMUM | | HEAD HEIGHT | 0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM | | HEAD STYLE | DISHED HEXAGON | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | PLUNGER PROTRUDING FROM HEAD 0.076 IN. MAX | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.375 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) | | THREAD QUANTITY PER INCH | 28 | | WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
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