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National Stock Number:
5305-01-048-1142
Federal Supply Class:
5305
National Item Identification Number:
010481142
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:
| 51B221-41 | 0JRC1 | NORTHROP GRUMMAN TECHNICAL SERVICES, INC. | | 51B221-41 | 76823 | NORTHROP GRUMMAN SYSTEMS CORPORATION |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.190 INCHES | | THREAD QUANTITY PER INCH | 32 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.246 INCHES MINIMUM AND | | 0.323 INCHES MAXIMUM | | FASTENER LENGTH | 2.823 INCHES MINIMUM AND | | 2.870 INCHES MAXIMUM | | MATERIAL | STEEL COMP E4340 OR | | STEEL COMP 4140 OR | | STEEL COMP 8740 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR | | MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OR | | MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM AND | | CHROMATE OR | | CADMIUM OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY2 CL2 FED SPEC 1ST TREATMENT RESPONSE OR | | NAS 672 ASSN STD 2ND TREATMENT RESPONSE OVERALL | | HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND | | 43.0 ROCKWELL C MAXIMUM OVERALL | | MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH | | HEAD STYLE | PAN | | HEAD DIAMETER | 0.361 INCHES MINIMUM AND | | 0.381 INCHES MAXIMUM | | HEAD HEIGHT | 0.103 INCHES MINIMUM AND | | 0.118 INCHES MAXIMUM | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | GRIP LENGTH | 2.547 INCHES MINIMUM AND | | 2.577 INCHES MAXIMUM | | GRIP DIAMETER | 0.1885 INCHES MINIMUM AND | | 0.1895 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES GRIP |
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