5305-01-185-2216, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-185-2216

Federal Supply Class:
5305

National Item Identification Number:
011852216

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:

HT4048-4D27	06950	HOWMET GLOBAL FASTENING SYSTEMS INC
HT4048-4D27	17446	HUCK INTERNATIONAL, INC
HT4048-4D27	56878	SPS TECHNOLOGIES, LLC
HT4048-4D27	73197	HI-SHEAR CORPORATION
HT4048-4D27	80539	SPS TECHNOLOGIES, LLC
HT4048-4D27	92215	HOWMET GLOBAL FASTENING SYSTEMS INC
ST3M713-4D27-1	76301	THE BOEING COMPANY
ST3M713-4D27-1	92215	HOWMET GLOBAL FASTENING SYSTEMS INC
HT4048-4D27	97928	HUCK INTL INC
HT4048-4D27	L4528	LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC

Techincal Specification:

COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	1.866 INCHES MINIMUM AND 1.906 INCHES MAXIMUM FIRST HOLE
FASTENER LENGTH	1.989 INCHES MINIMUM AND 2.019 INCHES MAXIMUM
GRIP DIAMETER	0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH	1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM
HEAD HEIGHT	0.056 INCHES MINIMUM AND 0.064 INCHES MAXIMUM
HEAD DIAMETER	0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM
HEAD STYLE	OVAL COUNTERSUNK UNDERCUT
INTERNAL DRIVE STYLE	HIGH-TORQUE
MATERIAL DOCUMENT AND CLASSIFICATION	AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP XM-13 OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES
SHANK UNTHREADED HOLE DIAMETER	0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	PASSIVATE OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL JOINT FINE (UNJF)
THREAD QUANTITY PER INCH	28

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