5305-00-979-8987, SCREW,EXTERNALLY RELIEVED BODY

National Stock Number:
5305-00-979-8987

Federal Supply Class:
5305

National Item Identification Number:
009798987

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:

394826	31949	BROOKS AUTOMATION, INC.
A1-4826	31949	BROOKS AUTOMATION, INC.

Techincal Specification:

DISTANCE FROM CENTERLINE TO FLAT	0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	0.125 INCHES NOMINAL
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FOURTH DIAMETER	2.148 INCHES MINIMUM AND 2.196 INCHES MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER	0.943 INCHES MINIMUM AND 0.959 INCHES MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER	1.486 INCHES MINIMUM AND 1.518 INCHES MAXIMUM
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY	4
FIRST DIAMETER FROM HEAD	0.250 INCHES NOMINAL
FOURTH DIAMETER FROM HEAD	0.186 INCHES MINIMUM AND 0.194 INCHES MAXIMUM
HEAD DIAMETER	0.389 INCHES MINIMUM AND 0.393 INCHES MAXIMUM
HEAD HEIGHT	0.189 INCHES MINIMUM AND 0.205 INCHES MAXIMUM
HEAD STYLE	DEE CHAMFER
INTERNAL DRIVE STYLE	CROSS RECESS TYPE 1
MATERIAL DOCUMENT AND CLASSIFICATION	SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP 4340 OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES
PART NAME ASSIGNED BY CONTROLLING AGENCY	NAVY SPECIAL PROJECT
SECOND DIAMETER FROM HEAD	0.197 INCHES MINIMUM AND 0.205 INCHES MAXIMUM
THREAD CLASS	2A
THREAD DIRECTION	RIGHT-HAND
THIRD DIAMETER FROM HEAD	0.250 INCHES MAXIMUM
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH	20

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