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National Stock Number:
5305-01-298-7765
Federal Supply Class:
5305
National Item Identification Number:
012987765
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:
| 3M939-4-8F | 0ZC92 | HEARTLAND PRECISION FASTENERS INC | | 3M939-4-8F | 1EM77 | B & B SPECIALTIES INC | | 3M939-4-8F | 1VSL7 | HOUSTON PRECISION FASTENERS I LP | | 3M939-4-8F | 56878 | SPS TECHNOLOGIES, LLC | | 3M939-4-8F | 58845 | ABOUNDING SECURITY INC DIV OF MAA CORP | | 3M939-4-8F | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | AIC939-4-8P | 06725 | SPS TECHNOLOGIES, LLC | | SC1823-4-8P | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | GS1018-4-8P | 1EM77 | B & B SPECIALTIES INC | | 3M939-4-8F | 60516 | WEST COAST AEROSPACE, INC. | | HR248-4-8BJ | 73197 | HI-SHEAR CORPORATION | | 3M939-4-8F | 76301 | THE BOEING COMPANY | | 3M939-4-8F | 80539 | SPS TECHNOLOGIES, LLC | | HR248-4-8BJ | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | SC5087-4-8P | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | VT1731-4-8P | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM | | FASTENER LENGTH | 0.954 INCHES MINIMUM AND 0.984 INCHES MAXIMUM | | FEATURES PROVIDED | CETYL ALCOHOL LUBRICANT | | GRIP LENGTH | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | HEAD DIAMETER | 0.3898 INCHES MINIMUM AND 0.3948 INCHES MAXIMUM | | HEAD STYLE | OVAL COUNTERSUNK | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | MATERIAL | NICKEL ALLOY 718 OVERALL | | MINIMUM TENSILE STRENGTH | 125000 POUNDS PER SQUARE INCH | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SURFACE TREATMENT | ALUMINUM OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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