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National Stock Number:
5305-01-256-3049
Federal Supply Class:
5305
National Item Identification Number:
012563049
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:
| 51B334-6X | 06725 | SPS TECHNOLOGIES, LLC | | 51B334-6X | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | 51B334-6X | 0JRC1 | NORTHROP GRUMMAN TECHNICAL SERVICES, INC. | | 51B334-6X | 27624 | SPS TECHNOLOGIES LLC | | 51B334-6X | 73197 | HI-SHEAR CORPORATION | | 51B334-6X | 76823 | NORTHROP GRUMMAN SYSTEMS CORPORATION | | 51B334-6X | 80539 | SPS TECHNOLOGIES, LLC | | 51B334-6X | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | 51B334-6X | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJC | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 28 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.306 INCHES MINIMUM AND | | 0.326 INCHES MAXIMUM | | FASTENER LENGTH | 0.681 INCHES MINIMUM AND | | 0.701 INCHES MAXIMUM | | MATERIAL | STEEL COMP 4340 OR | | STEEL COMP 4140 OR | | STEEL COMP 8740 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR | | MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OR | | MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.499 INCHES MINIMUM AND | | 0.507 INCHES MAXIMUM | | COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | GRIP LENGTH | 0.365 INCHES MINIMUM AND | | 0.385 INCHES MAXIMUM | | GRIP DIAMETER | 0.2640 INCHES MINIMUM AND | | 0.2650 INCHES MAXIMUM | | SPECIAL FEATURES | 0.0156 IN. OVERSIZE SHANK FOR REPAIR WORK ONLY |
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