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National Stock Number:
5305-01-524-1545
Federal Supply Class:
5305
National Item Identification Number:
015241545
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:
| 120-225C4-16 | 1GP79 | PILGRIM SCREW CORP | | 120-225C4-16 | 97499 | BELL TEXTRON INC |
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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 | 0.486 INCHES NOMINAL | | FASTENER LENGTH | 1.132 INCHES NOMINAL | | MATERIAL | IRON ALLOY 660 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS5731 ASSN STD 1ST MATERIAL RESPONSE OR | | AMS5732 ASSN STD 2ND MATERIAL RESPONSE OR | | AMS5737 ASSN STD 3RD MATERIAL RESPONSE OR | | AMS5853 ASSN STD 4TH MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | MINIMUM TENSILE STRENGTH | 3700 POUNDS PER SQUARE INCH | | HEAD STYLE | ROUND EXTENDED WASHER | | HEAD DIAMETER | 0.437 INCHES NOMINAL | | HEAD HEIGHT | 0.101 INCHES NOMINAL | | EXTENDED WASHER DIAMETER | 0.500 INCHES NOMINAL | | EXTENDED WASHER THICKNESS | 0.030 INCHES NOMINAL | | INTERNAL DRIVE STYLE | CRUCIFORM RIBBED | | GRIP LENGTH | 0.500 INCHES NOMINAL | | GRIP DIAMETER | 0.249 INCHES NOMINAL | | CRITICALITY CODE JUSTIFICATION | AGAV | | PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW, WASHER HEAD, CLOSE TOLERANCE, LONG THREAD, 95 KSI FSU |
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