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National Stock Number:
5305-01-111-9153
Federal Supply Class:
5305
National Item Identification Number:
011119153
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:
| AS221-04-0845 | 84256 | AVIBANK MFG., INC. |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNF | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 28 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.540 INCHES MINIMUM AND | | 0.570 INCHES MAXIMUM | | FASTENER LENGTH | 1.475 INCHES MINIMUM AND | | 1.495 INCHES MAXIMUM | | MATERIAL | STEEL COMP 440C LOCKING FEATURE | | STEEL COMP 631 OR | | STEEL COMP 302 SPRING | | STEEL COMP XM-13 FASTENER | | MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE LOCKING FEATURE | | AMS 5673 ASSN STD SINGLE MATERIAL RESPONSE OR | | QQ-W-423 FED SPEC SINGLE MATERIAL RESPONSE SPRING | | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE FASTENER | | SURFACE TREATMENT | PASSIVATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OR | | FPS-3007, CAGE84256 MFR REF SINGLE TREATMENT RESPONSE OVERALL | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.449 INCHES MINIMUM AND | | 0.507 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | LOCKING FEATURE | DETENT BALL GRIP | | GRIP LENGTH | 0.835 INCHES MINIMUM AND | | 0.855 INCHES MAXIMUM | | GRIP DIAMETER | 0.2480 INCHES MINIMUM AND | | 0.2492 INCHES MAXIMUM |
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