5305-01-414-7520, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-414-7520

Federal Supply Class:
5305

National Item Identification Number:
014147520

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:

AS292-4-22	84256	AVIBANK MFG., INC.
GB510CG4-22	26512	NORTHROP GRUMMAN SYSTEMS CORPORATION
GB510CG4-22	84256	AVIBANK MFG., INC.

Techincal Specification:

THREAD SERIES DESIGNATOR	UNJF
NOMINAL THREAD DIAMETER	0.250 INCHES
THREAD QUANTITY PER INCH	28
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.308 INCHES MINIMUM
FASTENER LENGTH	1.793 INCHES MINIMUM AND
	1.813 INCHES MAXIMUM
MATERIAL	STEEL COMP 440C LOCKING FEATURE
	STEEL COMP 631 OR
	STEEL COMP 302 SPRING
	STEEL COMP XM-13 FASTENER
MATERIAL DOCUMENT AND CLASSIFICATION	QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE LOCKING FEATURE
	AMS 5673 ASSN STD SINGLE MATERIAL RESPONSE OR
	QQ-W-423, COND B FED SPEC SINGLE MATERIAL RESPONSE SPRING
	AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE FASTENER
SURFACE TREATMENT	PASSIVATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
HARDNESS RATING	50.0 ROCKWELL C MINIMUM AND
	62.0 ROCKWELL C MAXIMUM SPRING
	43.0 ROCKWELL C MINIMUM AND
	47.0 ROCKWELL C MAXIMUM FASTENER
HEAD STYLE	FLAT COUNTERSUNK
HEAD DIAMETER	0.449 INCHES MINIMUM AND
	0.507 INCHES MAXIMUM
COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND
	101.0 DEGREES MAXIMUM
INTERNAL DRIVE STYLE	OFFSET CRUCIFORM (TORQUE SET)
LOCKING FEATURE	DETENT BALL GRIP
GRIP LENGTH	1.377 INCHES MINIMUM
GRIP DIAMETER	0.2487 INCHES MINIMUM AND
	0.2492 INCHES MAXIMUM
SURFACE FINISH	32.0 MICROINCHES BEARING SURFACE OF HEAD
	32.0 MICROINCHES GRIP
PART NAME ASSIGNED BY CONTROLLING AGENCY	NAVY SPECIAL PROJECT

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