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National Stock Number:
5305-00-721-8346
Federal Supply Class:
5305
National Item Identification Number:
007218346
Description:
THUMBSCREW
Detail:
An externally threaded fastener whose threaded portion is of one nominal diameter. It may have an unthreaded portion with a diameter less than, equal to, or greater than the diameter of the threaded portion. It has either a vertically flattened, circular knurled, or wing type head, all of which are designed for rotation by the thumb and fingers. For items having wrenching facilities such as socket recess, multiple spline or slot heads, use SCREW (as modified) or BOLT (as modified).
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Manufacturer Information:
| 8157901 | 18876 | U S ARMY AVIATION AND MISSILE COMMAND |
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Techincal Specification:
| DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM | | EXTERNALLY RELIEVED BODY DIAMETER QUANTITY | 1 | | FASTENER LENGTH | 0.703 INCHES MINIMUM AND 0.734 INCHES MAXIMUM | | FIRST DIAMETER FROM HEAD | 0.182 INCHES MINIMUM AND 0.187 INCHES MAXIMUM | | HEAD DIAMETER | 0.734 INCHES MINIMUM AND 0.766 INCHES MAXIMUM | | HEAD HEIGHT | 0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM | | HEAD STYLE | KNURLED NO. 1 | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | POINT STYLE | FLAT | | THREAD CLASS | 2A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.203 INCHES MINIMUM AND 0.234 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 20 | | THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |
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