5305-00-638-1648, SCREW,EXTERNALLY RELIEVED BODY

5305-00-638-1649 SCREW,EXTERNALLY RELIEVED BODY

National Stock Number:
5305-00-638-1648

Federal Supply Class:
5305

National Item Identification Number:
006381648

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:

187373

56232

LOCKHEED MARTIN CORPORATION

Techincal Specification:

DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	0.047 INCHES NOMINAL
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER	0.253 INCHES MINIMUM AND 0.255 INCHES MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER	0.300 INCHES MINIMUM AND 0.302 INCHES MAXIMUM
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY	3
FASTENER LENGTH	0.722 INCHES NOMINAL
FIRST DIAMETER FROM HEAD	0.410 INCHES MINIMUM AND 0.420 INCHES MAXIMUM
HEAD HEIGHT	0.143 INCHES MINIMUM AND 0.153 INCHES MAXIMUM
HEAD DIAMETER	0.625 INCHES NOMINAL
HEAD STYLE	FLAT CHAMFER
INTERNAL DRIVE STYLE	CROSS RECESS TYPE 1
MATERIAL DOCUMENT AND CLASSIFICATION	QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP 303 OVERALL
NOMINAL THREAD DIAMETER	0.312 INCHES
SECOND DIAMETER FROM HEAD	0.435 INCHES MINIMUM AND 0.436 INCHES MAXIMUM
SURFACE TREATMENT	PASSIVATE AND OXIDE OVERALL
THREAD CLASS	2A
THREAD DIRECTION	RIGHT-HAND
THIRD DIAMETER FROM HEAD	0.260 INCHES NOMINAL
THREAD LENGTH	0.422 INCHES MINIMUM
THREAD QUANTITY PER INCH	24
THREAD SERIES DESIGNATOR	UNF

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