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National Stock Number:
5305-00-639-0521
Federal Supply Class:
5305
National Item Identification Number:
006390521
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:
| 681166 | 24617 | GENERAL MOTORS CORP | | 8393223 | 19207 | U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM | | P9419R | 45722 | USM CORP SUB OF EMHART INDUSTRIES INC PARKER-KALON FASTENER DIV |
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Techincal Specification:
| FASTENER LENGTH | 0.980 INCHES MINIMUM AND 1.020 INCHES MAXIMUM | | HEAD HEIGHT | 0.605 INCHES MINIMUM AND 0.635 INCHES MAXIMUM | | HEAD STYLE | THUMB NO. 3 | | MATERIAL | STEEL OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | ASSEMBLED W/WASHER 1/4 IN. ID,0.620 IN. OD,0.050 IN. PORM 0.010 THK | | POINT STYLE | FLAT | | WIDTH BETWEEN FLATS | 0.521 INCHES MINIMUM AND 0.551 INCHES MAXIMUM | | SURFACE TREATMENT | CADMIUM OR ZINC OVERALL | | THREAD CLASS | 2A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.875 INCHES MINIMUM | | THREAD QUANTITY PER INCH | 20 | | THREAD SERIES DESIGNATOR | UNC |
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