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National Stock Number:
5305-01-266-8583
Federal Supply Class:
5305
National Item Identification Number:
012668583
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:
| 11839V4-10-27 | 59563 | REID PRODUCTS INC. | | 3M1034V4-10-27 | 76301 | THE BOEING COMPANY | | 3M1034V4-10-27 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4075V4-10-27 | 03950 | NAVAL INVENTORY CONTROL POINT MECHANICSBURG | | HT4075V4-10-27 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4075V4-10-27 | 56878 | SPS TECHNOLOGIES, LLC | | HT4075V4-10-27 | 73197 | HI-SHEAR CORPORATION | | HT4075V4-10-27 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4075V4-10-27 | 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 | 1.079 INCHES MINIMUM AND 1.109 INCHES MAXIMUM | | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM | | HEAD DIAMETER | 0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 4928 ASSN STD 1ST MATERIAL RESPONSE AND AMS 4967 ASSN STD 2ND MATERIAL RESPONSE OVERALL | | MATERIAL | TITANIUM ALLOY UNS R56400 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT | | SPECIAL FEATURES | THD HOLE IN TOP OF HEAD 0.138-32 UNJC-3B+ THREADED HOLE 0.300 IN. MIN 0.345 IN. MAX DP; COUNTERBORE 0.145 IN. MIN LG,0.150 IN. MAX LG; 0.060 IN. WIDE IN. WIDE IN UNTHREADED SHANK; DISTANT FROM TOP OF HEAD TO BEGINNING OF INJECTION PORT 0.270 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNJF |
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