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National Stock Number:
5305-01-488-3727
Federal Supply Class:
5305
National Item Identification Number:
014883727
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:
| CA21351-4-2RS | 92215 | HOWMET GLOBAL FASTENING SYSTEMS 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 | 0.477 INCHES MINIMUM AND | | 0.607 INCHES MAXIMUM | | FASTENER LENGTH | 0.857 INCHES NOMINAL | | MATERIAL | IRON ALLOY 660 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS5731 NATIONAL STD/SPEC 1ST MATERIAL RESPONSE OR | | AMS5737 NATIONAL STD/SPEC 2ND MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS QQ-P-35 NATIONAL STD/SPEC ALL TREATMENT RESPONSES OVERALL | | MINIMUM TENSILE STRENGTH | 2845 POUNDS PER SQUARE INCH | | SINGLE SHEAR STRENGTH | 4140 POUNDS PER SQUARE INCH | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.435 INCHES NOMINAL | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 100.0 DEGREES MAXIMUM | | LOCKING FEATURE | DETENT RING LOCKING FEATURE | | GRIP LENGTH | 0.150 INCHES MINIMUM AND | | 0.280 INCHES MAXIMUM | | GRIP DIAMETER | 0.249 INCHES NOMINAL | | POINT STYLE | CHAMFER DOG | | POINT LENGTH | 0.100 INCHES NOMINAL | | POINT DIAMETER | 0.211 INCHES MINIMUM AND | | 0.216 INCHES MAXIMUM | | POINT CHAMFER ANGLE | 45.0 DEGREES NOMINAL | | SPECIAL FEATURES | DRIVE STYLE IS: RADIAL-SLOT RECESS/ FAIRCHILD AEROSPACE, NOT LISTED THIS FIIG. BORED HOLE, THREADED END, 0.130 IN DIA, 0.620 IN DP; WIRE FORM HOLD-OUT SPRING INSERTED; 2 LEAD THREAD. | | SPECIAL TEST FEATURES | STUD BOLTS SHALL HAVE POLYPROPLENE HEAD PROTECTIVE RING INSTALLED FOR SHIPPING, CUSTOMER TO REMOVE RINGS BEFORE INSTALLING | | PART NAME ASSIGNED BY CONTROLLING AGENCY | STUD BOLT |
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