5305-00-472-2840, SCREW,EXTERNALLY RELIEVED BODY

5305-00-472-2839 SCREW,EXTERNALLY RELIEVED BODY

National Stock Number:
5305-00-472-2840

Federal Supply Class:
5305

National Item Identification Number:
004722840

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:

9176223-9

18876

U S ARMY AVIATION AND MISSILE COMMAND

Techincal Specification:

DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	0.755 INCHES MINIMUM AND 0.775 INCHES MAXIMUM
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY	1
FASTENER LENGTH	1.286 INCHES MINIMUM AND 1.306 INCHES MAXIMUM
FIRST DIAMETER FROM HEAD	0.150 INCHES MINIMUM AND 0.160 INCHES MAXIMUM
HEAD DIAMETER	0.433 INCHES MINIMUM AND 0.443 INCHES MAXIMUM
HEAD HEIGHT	0.546 INCHES MINIMUM AND 0.578 INCHES MAXIMUM
HEAD STYLE	KNURLED NO. 1
INTERNAL DRIVE STYLE	SLOT
MATERIAL DOCUMENT AND CLASSIFICATION	QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP 302 OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES
SPECIAL FEATURES	CONE POINT 90 DEGREE ANGLE
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	171,FINISH NO. 5.4.1 MIL STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	PASSIVATE OVERALL
THREAD CLASS	2A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.406 INCHES MINIMUM
THREAD SERIES DESIGNATOR	UNF
THREAD QUANTITY PER INCH	28

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