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National Stock Number:
5305-01-597-5155
Federal Supply Class:
5305
National Item Identification Number:
015975155
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:
| BACB30FB4-2 | 1RC86 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30FB4-2 | 56878 | SPS TECHNOLOGIES, LLC | | BACB30FB4-2 | 73197 | HI-SHEAR CORPORATION | | BACB30FB4-2 | 81205 | THE BOEING COMPANY |
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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 | 0.535 INCHES MINIMUM AND | | 0.565 INCHES MAXIMUM | | MATERIAL | STEEL COMP E4340 OR | | STEEL COMP 4340 OR | | STEEL COMP 8740 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OR | | AMS 6415 ASSN STD SINGLE MATERIAL RESPONSE OR | | AMS 6484 ASSN STD SINGLE MATERIAL RESPONSE OR | | AMS 6322 ASSN STD 1ST MATERIAL RESPONSE OR | | MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416, TYPE II CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | MINIMUM TENSILE STRENGTH | 2550 POUNDS PER SQUARE INCH | | HEAD STYLE | FILLISTER COUNTERSUNK | | HEAD DIAMETER | 0.350 INCHES MINIMUM AND | | 0.399 INCHES MAXIMUM | | HEAD HEIGHT | 0.015 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | RECESSED TYPE I | | GRIP LENGTH | 0.115 INCHES MINIMUM AND | | 0.135 INCHES MAXIMUM | | GRIP DIAMETER | 0.249 INCHES MINIMUM AND | | 0.250 INCHES MAXIMUM | | PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT, 100 DEGREE REDUCED HEAD, DOVETAIL RECESS, LONG THREAD, CLOSE TOLERANCE, ALLOY STEEL |
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