5305-00-020-9841, SCREW,CLOSE TOLERANCE

6625-00-020-9834 TRANSFORMER,RADIO FREQUENCY

National Stock Number:
5305-00-020-9841

Federal Supply Class:
5305

National Item Identification Number:
000209841

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.

Manufacturer Information:

C079-4-11	81755	LOCKHEED MARTIN CORPORATION
SFT930-4-11	56878	SPS TECHNOLOGIES, LLC
VS2787T4C11	92215	HOWMET GLOBAL FASTENING SYSTEMS INC

Techincal Specification:

COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
FASTENER LENGTH	0.964 INCHES MINIMUM AND 1.011 INCHES MAXIMUM
GRIP DIAMETER	0.2483 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM
GRIP LENGTH	0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM
HARDNESS RATING	55.0 ROCKWELL C MINIMUM AND 58.0 ROCKWELL C MAXIMUM OVERALL
HEAD DIAMETER	0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM
HEAD STYLE	FLAT COUNTERSUNK
INTERNAL DRIVE STYLE	OFFSET CRUCIFORM (TORQUE SET)
MATERIAL DOCUMENT AND CLASSIFICATION	VANADIUM ALLOY M-A,VANADIUM ALLOYS STEEL CO MFR REF SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	STEEL OVERALL
MINIMUM TENSILE STRENGTH	300000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.250 INCHES
SURFACE FINISH	32.0 MICROINCHES GRIP
SURFACE FINISH	32.0 MICROINCHES THREADS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	AMS 2416 ASSN STD ALL TREATMENT RESPONSES OVERALL
SURFACE TREATMENT	NICKEL AND CADMIUM OVERALL
THREAD LENGTH	0.265 INCHES MINIMUM AND 0.334 INCHES MAXIMUM
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD SERIES DESIGNATOR	UNJF
THREAD QUANTITY PER INCH	28

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