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National Stock Number:
5305-00-933-7291
Federal Supply Class:
5305
National Item Identification Number:
009337291
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:
| BACB30JC8-14 | 06725 | SPS TECHNOLOGIES, LLC | | BACB30JC8-14 | 56878 | SPS TECHNOLOGIES, LLC | | HL21PB8-14 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HL21PB8-14 | 56878 | SPS TECHNOLOGIES, LLC | | BACB30JC8-14 | 60516 | WEST COAST AEROSPACE, INC. | | BACB30JC8-14 | 77272 | THE BOEING COMPANY | | HL21PB8-14 | 73197 | HI-SHEAR CORPORATION | | HL21PB8-14 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HL21PB8-14 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM | | FASTENER LENGTH | 1.260 INCHES MINIMUM AND 1.280 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM | | HEAD DIAMETER | 0.464 INCHES MINIMUM AND 0.510 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | HEXAGON | | MATERIAL | STEEL COMP 4130 OR STEEL COMP 4140 OR STEEL COMP 8740 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | DRILLED HOLE THD END 0.122 TO 0.142 IN. DIA,0.200 IN. DEEP | | WIDTH ACROSS FLATS | 0.095 INCHES MINIMUM AND 0.097 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL | | SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.380 INCHES MINIMUM AND 0.410 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNJF |
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