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National Stock Number:
5305-01-450-3255
Federal Supply Class:
5305
National Item Identification Number:
014503255
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:
| 12981727-2 | 19200 | US ARMY ARDEC RDECOM |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNC | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 20 | | THREAD CLASS | 2A | | NONSTANDARD THREAD PITCH DIAMETER | 0.2139 TO 0.2175 INCHES | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.490 INCHES MINIMUM AND | | 0.510 INCHES MAXIMUM | | FASTENER LENGTH | 4.150 INCHES MINIMUM AND | | 4.170 INCHES MAXIMUM | | MATERIAL | STEEL COMP 303 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | ASTM A581, A582, OR AMS 5640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-STD-171, PARA 5.4.1 MIL STD SINGLE TREATMENT RESPONSE OVERALL | | HEAD STYLE | KNURLED NO. 6 | | HEAD DIAMETER | 0.495 INCHES MINIMUM AND | | 0.505 INCHES MAXIMUM | | HEAD HEIGHT | 1.580 INCHES MINIMUM AND | | 1.600 INCHES MAXIMUM | | DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER | 4.160 INCHES NOMINAL |
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