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National Stock Number:
5305-01-591-0029
Federal Supply Class:
5305
National Item Identification Number:
015910029
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:
| 11923-4-20 | 59563 | REID PRODUCTS INC. | | HT4027-4-20 | 06725 | SPS TECHNOLOGIES, LLC | | HT4027-4-20 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4027-4-20 | 17446 | HUCK INTERNATIONAL, INC | | HT4027-4-20 | 27624 | SPS TECHNOLOGIES LLC | | HT4027-4-20 | 56878 | SPS TECHNOLOGIES, LLC | | ST3M557-4-20 | 06710 | VALLEY-TODECO, INC. | | ST3M557-4-20 | 0K6Z0 | SATURN FASTENERS INC | | ST3M557-4-20 | 0ZC92 | HEARTLAND PRECISION FASTENERS INC | | ST3M557-4-20 | 1VSL7 | HOUSTON PRECISION FASTENERS I LP | | HT4027-4-20 | 73197 | HI-SHEAR CORPORATION | | HT4027-4-20 | 80539 | SPS TECHNOLOGIES, LLC | | HT4027-4-20 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4027-4-20 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | ST3M557-4-20 | 4WL75 | CAMCAR LLC DIV CAMCAR LLC | | WC4027-4-20 | 60516 | WEST COAST AEROSPACE, INC. | | ST3M557-4-20 | 76301 | THE BOEING COMPANY | | ST3M557-4-20 | U6683 | LINREAD LTD DBA LINREAD NORTHBRIDGE |
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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 | 0.469 INCHES NOMINAL | | FASTENER LENGTH | 1.282 INCHES MINIMUM AND | | 1.312 INCHES MAXIMUM | | MATERIAL | NICKEL ALLOY 718 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2700 ASSN STD SINGLE TREATMENT RESPONSE OVERALL | | HEAD STYLE | FILLISTER COUNTERSUNK | | HEAD DIAMETER | 0.390 INCHES MINIMUM AND | | 0.395 INCHES MAXIMUM | | HEAD HEIGHT | 0.015 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | GRIP LENGTH | 1.250 INCHES NOMINAL | | GRIP DIAMETER | 0.249 INCHES MINIMUM AND | | 0.250 INCHES MAXIMUM | | POINT STYLE | FLAT | | POINT LENGTH | 0.045 INCHES NOMINAL | | POINT CHAMFER ANGLE | 45.0 DEGREES NOMINAL | | SPECIAL FEATURES | HEAD HAS A 1.40 DEGREE RADIUS DOME. | | PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW-CLOSE TOLERANCE, 100 DEG COUNTERSUNK, REDUCED HEAD, HI-TORQUE, NON-MAGNETIC CRES (125 KSI FUS) |
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