5305-01-310-3963, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-310-3963

Federal Supply Class:
5305

National Item Identification Number:
013103963

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:

HT4049-4D6	06950	HOWMET GLOBAL FASTENING SYSTEMS INC
HT4049-4D6	17446	HUCK INTERNATIONAL, INC
HT4049-4D6	73197	HI-SHEAR CORPORATION
HT4049-4D6	80539	SPS TECHNOLOGIES, LLC
HT4049-4D6	92215	HOWMET GLOBAL FASTENING SYSTEMS INC
HT4049-4D6	97928	HUCK INTL INC
ST3M714-4D6	76301	THE BOEING COMPANY
ST3M714-4D6	92215	HOWMET GLOBAL FASTENING SYSTEMS INC
HT4049-4D6	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	0.553 INCHES MINIMUM AND 0.593 INCHES MAXIMUM FIRST HOLE
FASTENER LENGTH	0.676 INCHES MINIMUM AND 0.706 INCHES MAXIMUM
GRIP LENGTH	0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM
GRIP DIAMETER	0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
HEAD DIAMETER	0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM
HEAD HEIGHT	0.106 INCHES NOMINAL
HEAD STYLE	FLAT COUNTERSUNK UNDERCUT
INTERNAL DRIVE STYLE	HIGH-TORQUE
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCY	NAVY SPECIAL PROJECT
MINIMUM TENSILE STRENGTH	125000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.250 INCHES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD CLASS	3A
THREAD LENGTH	0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM
THREAD DIRECTION	RIGHT-HAND
THREAD QUANTITY PER INCH	28

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