5305-01-432-6256, SCREW,EXTERNALLY RELIEVED BODY

National Stock Number:
5305-01-432-6256

Federal Supply Class:
5305

National Item Identification Number:
014326256

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:

5305014326256	A00AM	E.C.A ETABLISSEMENT CENTRAL DESAPPROVISIONNEMENTS DES FORCES ARMEE
9338540-2	19200	US ARMY ARDEC RDECOM

Techincal Specification:

COLOR	BRONZE OR OLIVE DRAB OVERALL
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	1.280 INCHES NOMINAL
EXTENDED WASHER DIAMETER	1.107 INCHES MINIMUM AND 1.125 INCHES MAXIMUM
EXTENDED WASHER THICKNESS	0.200 INCHES NOMINAL
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY	1
FASTENER LENGTH	2.160 INCHES MINIMUM AND 2.190 INCHES MAXIMUM
FIRST DIAMETER FROM HEAD	0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM
HARDNESS RATING	36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
HEAD HEIGHT	0.750 INCHES NOMINAL
HEAD STYLE	DOUBLE HEXAGON EXTENDED WASHER
INTERNAL DRIVE STYLE	W/O INTERNAL DRIVE
MATERIAL	STEEL OVERALL
MINIMUM YIELD STRENGTH	130000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.750 INCHES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	MIL-STD-171 MIL STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	CHROMATE OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.850 INCHES MINIMUM AND 0.910 INCHES MAXIMUM
THREAD QUANTITY PER INCH	10
THREAD SERIES DESIGNATOR	UN
WIDTH BETWEEN FLATS	0.743 INCHES MINIMUM AND 0.752 INCHES MAXIMUM

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