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National Stock Number:
5305-00-825-3446
Federal Supply Class:
5305
National Item Identification Number:
008253446
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:
| 1C6138P03 | 07482 | GENERAL ELECTRIC COMPANY |
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Techincal Specification:
| FASTENER LENGTH | 1.720 INCHES MINIMUM AND 1.760 INCHES MAXIMUM | | HARDNESS RATING | 30.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OVERALL | | HEAD DIAMETER | 0.720 INCHES MINIMUM AND 0.780 INCHES MAXIMUM | | HEAD HEIGHT | 0.360 INCHES MINIMUM AND 0.400 INCHES MAXIMUM | | HEAD STYLE | KNURLED NO. 1 | | MATERIAL DOCUMENT AND CLASSIFICATION | SAE ASSN STD ALL MATERIAL RESPONSES OVERALL | | MATERIAL | STEEL COMP 4130 OR STEEL COMP 4140 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | POINT STYLE | POINTLESS | | SHOULDER DIAMETER | 0.326 INCHES MINIMUM AND 0.328 INCHES MAXIMUM FIRST SHOULDER | | SHOULDER SHAPE | ROUND FIRST SHOULDER | | SHOULDER LENGTH | 0.980 INCHES MINIMUM AND 1.020 INCHES MAXIMUM FIRST SHOULDER | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNF | | THREAD QUANTITY PER INCH | 28 |
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