5305-01-055-6524, SCREW,EXTERNALLY RELIEVED BODY

4820-01-055-6523 PLATE,DIAPHRAGM BACKING

National Stock Number:
5305-01-055-6524

Federal Supply Class:
5305

National Item Identification Number:
010556524

Description:
SCREW,EXTERNALLY RELIEVED BODY

Detail:
An externally threaded fastener whose threaded portion is of one nominal diameter, and whose unthreaded portion has been machined or ground in one or more places or over its entire length to a maximum diameter less than the minimum pitch diameter of the thread (excludes undercut for thread relief). It is No. 0 (0.060 IN.) (1.5 mm) or larger, and is designed to be held or driven with either a wrench or inserted driver (excluding internal socket and multiple spline types) or both in sizes below No. 10 (0.190 IN.) (5 mm) and larger sizes must have a head designed for any type inserted driver (excluding internal socket and multiple spline types) but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. See also BOLT, EXTERNALLY RELIEVED BODY and BOLT, INTERNAL WRENCHING.

Manufacturer Information:

656-064-9001	58998	FASTENER INNOVATION TECHNOLOGY, INC.
656-064-9001	70210	HONEYWELL INTERNATIONAL INC.
DIA7900-6-A-2	0HDW7	HUCK INTERNATIONAL, INC.
DIA7900-6-A-2	97928	HUCK INTL INC

Techincal Specification:

DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	0.015 INCHES MINIMUM AND 0.025 INCHES MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER	0.262 INCHES NOMINAL
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER	0.062 INCHES NOMINAL
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY	3
FASTENER LENGTH	0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM
FIRST DIAMETER FROM HEAD	0.250 INCHES MINIMUM AND 0.280 INCHES MAXIMUM
HEAD DIAMETER	0.250 INCHES MINIMUM AND 0.280 INCHES MAXIMUM
HEAD HEIGHT	0.067 INCHES MINIMUM AND 0.097 INCHES MAXIMUM
HEAD STYLE	FILLISTER
INTERNAL DRIVE STYLE	SLOT
MATERIAL	STEEL COMP 4037 OVERALL
NOMINAL THREAD DIAMETER	0.138 INCHES
SECOND DIAMETER FROM HEAD	0.200 INCHES MINIMUM AND 0.205 INCHES MAXIMUM
SPECIAL FEATURES	PANEL ASSEMBLED TO THE LAST RELIEVED DIAMETER NEAR THREADS;PANEL THICKNESS 0.030 IN. MIN.;0.046 IN. MAX.;DIA.OF PANEL 0.208 IN. MIN. 0.213 IN. MAX.;PANEL IS FLANGED MIN.99 DEGREES MAX. 100 DEGREES
SURFACE TREATMENT	CADMIUM OVERALL
THREAD CLASS	2A
THREAD DIRECTION	RIGHT-HAND
THIRD DIAMETER FROM HEAD	0.138 INCHES NOMINAL
THREAD LENGTH	0.165 INCHES MINIMUM AND 0.195 INCHES MAXIMUM
THREAD QUANTITY PER INCH	32
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL COARSE (UNC)

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