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National Stock Number:
5305-00-800-8427
Federal Supply Class:
5305
National Item Identification Number:
008008427
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:
| 8008427 | 18876 | U S ARMY AVIATION AND MISSILE COMMAND |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNC | | NOMINAL THREAD DIAMETER | 0.312 INCHES | | THREAD QUANTITY PER INCH | 18 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.359 INCHES MINIMUM AND | | 0.391 INCHES MAXIMUM | | FASTENER LENGTH | 1.078 INCHES MINIMUM AND | | 1.109 INCHES MAXIMUM | | MATERIAL | STEEL COMP 416 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-764,COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-STD-171,FINISH NO.5.4.1,TYPE 3 MIL STD SINGLE TREATMENT RESPONSE OVERALL | | HEAD STYLE | KNURLED NO. 1 | | HEAD DIAMETER | 1.234 INCHES MINIMUM AND | | 1.266 INCHES MAXIMUM | | HEAD HEIGHT | 0.359 INCHES MINIMUM AND | | 0.391 INCHES MAXIMUM | | POINT STYLE | FLAT | | POINT LENGTH | 0.109 INCHES MINIMUM AND | | 0.141 INCHES MAXIMUM | | POINT CHAMFER ANGLE | 45.0 DEGREES NOMINAL | | SHOULDER SHAPE | ROUND FIRST SHOULDER | | SHOULDER DIAMETER | 0.625 INCHES NOMINAL FIRST SHOULDER | | SHOULDER LENGTH | 0.250 INCHES NOMINAL FIRST SHOULDER | | EXTERNALLY RELIEVED BODY DIAMETER QUANTITY | 1 | | FIRST DIAMETER FROM HEAD | 0.229 INCHES MINIMUM AND | | 0.239 INCHES MAXIMUM | | DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 0.578 INCHES MINIMUM AND | | 0.609 INCHES MAXIMUM | | THE MANUFACTURERS DATA | | | MANUFACTURERS CODE | 18876 | | DESIGN CONTROL REFERENCE | 8008427 |
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