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National Stock Number:
5305-01-563-0156
Federal Supply Class:
5305
National Item Identification Number:
015630156
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:
| 13019652 | 19200 | US ARMY ARDEC RDECOM |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNC | | NONSTANDARD THREAD PITCH DIAMETER | -32.0 TO 50.0 INCHES | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.562 INCHES NOMINAL | | FASTENER LENGTH | 0.615 INCHES MINIMUM | | MATERIAL | STEEL OVERALL | | SURFACE TREATMENT | ZINC OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | F21A AND F21B MFR REF ALL TREATMENT RESPONSES OVERALL | | HEAD STYLE | KNURLED NO. 1 | | HEAD DIAMETER | 0.490 INCHES MINIMUM | | HEAD HEIGHT | 0.375 INCHES NOMINAL | | SPECIAL FEATURES | 0.250-26 BSF THREAD SIZE AND SERIES |
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