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National Stock Number:
5305-00-528-1501
Federal Supply Class:
5305
National Item Identification Number:
005281501
Description:
SCREW,CLOSE TOLERANCE
Detail:
A SCREW, MACHINE or SCREW, CAP, SOCKET HEAD whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 IN.) (0.025 mm) or less of a specific diameter for items (1.000 IN.) (25 mm) or less in diameter. Items over (1.000 IN.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 IN.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 IN.) (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 designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.
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Manufacturer Information:
| A51H24500-11 | 26512 | NORTHROP GRUMMAN SYSTEMS CORPORATION | | A51H24500-11 | 61174 | NORTHROP GRUMMAN SYSTEMS CORPORATION | | A51H24500-11 | 79RG9 | NORTHROP GRUMMAN SYSTEMS CORPORATION |
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Techincal Specification:
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.643 INCHES MINIMUM AND 1.675 INCHES MAXIMUM FIRST HOLE | | FASTENER LENGTH | 1.778 INCHES NOMINAL | | GRIP DIAMETER | 0.5607 INCHES MINIMUM AND 0.5616 INCHES MAXIMUM | | GRIP LENGTH | 1.178 INCHES MINIMUM AND 1.198 INCHES MAXIMUM | | HARDNESS RATING | 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL | | HEAD HEIGHT | 0.328 INCHES NOMINAL | | HEAD STYLE | DOUBLE HEXAGON | | INTERNAL DRIVE STYLE | SLOT | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL COMP H11 OVERALL | | NOMINAL THREAD DIAMETER | 0.562 INCHES | | SHANK UNTHREADED HOLE DIAMETER | 0.136 INCHES MINIMUM AND 0.146 INCHES MAXIMUM FIRST HOLE | | WIDTH BETWEEN FLATS | 0.865 INCHES MINIMUM AND 0.877 INCHES MAXIMUM | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.580 INCHES MINIMUM AND 0.600 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 18 | | THREAD SERIES DESIGNATOR | UNJF |
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