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National Stock Number:
5305-01-536-3094
Federal Supply Class:
5305
National Item Identification Number:
015363094
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:
| BACB30NN4K17 | 81205 | THE BOEING COMPANY | | BACB30NN4K17 | Z03F0 | BOEING DEFENCE AUSTRALIA LTD | | BACB30NN4K17 | Z8T75 | BOEING DEFENCE AUSTRALIA LTD |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 28 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.425 INCHES NOMINAL | | FASTENER LENGTH | 1.472 INCHES MINIMUM AND | | 1.502 INCHES MAXIMUM | | MATERIAL | TITANIUM ALLOY UNS R56400 OVERALL | | SURFACE TREATMENT | ALUMINUM OVERALL | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.465 INCHES NOMINAL | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 | | GRIP LENGTH | 1.052 INCHES MINIMUM AND | | 1.072 INCHES MAXIMUM | | GRIP DIAMETER | 0.248 INCHES MINIMUM AND | | 0.249 INCHES MAXIMUM |
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