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National Stock Number:
5305-00-096-1343
Federal Supply Class:
5305
National Item Identification Number:
000961343
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.
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Manufacturer Information:
| 723989-1 | 99251 | MISSION SYSTEMS DAVENPORT INC. |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNF | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 28 | | THREAD CLASS | 2A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.127 INCHES MINIMUM | | FASTENER LENGTH | 0.187 INCHES NOMINAL | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-7720,COMP FM MIL SPEC ALL MATERIAL RESPONSES OVERALL | | HARDNESS RATING | 95.5 ROCKWELL B NOMINAL OVERALL | | HEAD STYLE | FLAT CHAMFER | | HEAD DIAMETER | 0.365 INCHES MINIMUM AND | | 0.369 INCHES MAXIMUM | | HEAD HEIGHT | 0.150 INCHES NOMINAL | | INTERNAL DRIVE STYLE | SLOT | | EXTERNALLY RELIEVED BODY DIAMETER QUANTITY | 2 | | FIRST DIAMETER FROM HEAD | 0.250 INCHES NOMINAL | | SECOND DIAMETER FROM HEAD | 0.203 INCHES NOMINAL | | DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 0.030 INCHES NOMINAL | | DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER | 0.057 INCHES MINIMUM AND | | 0.063 INCHES MAXIMUM | | SPECIAL FEATURES | 4 DRILLED HOLES IN HEAD | | THE MANUFACTURERS DATA | | | MANUFACTURERS CODE | 99251 | | DESIGN CONTROL REFERENCE | 723989-1 |
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