5305-00-509-5453 THUMBSCREW Index 3040-00-509-5462 WORM SHAFT

National Stock Number:
5305-00-509-5454

Federal Supply Class:
5305

National Item Identification Number:
005095454

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).


Manufacturer Information:
757942319200US ARMY ARDEC RDECOM


Techincal Specification:
FASTENER LENGTH0.709 INCHES MINIMUM AND 0.729 INCHES MAXIMUM
HEAD HEIGHT0.875 INCHES NOMINAL
HEAD STYLEWING NO. 2
MATERIALSTEEL OVERALL
NOMINAL THREAD DIAMETER0.312 INCHES
POINT CHAMFER ANGLE120.0 DEGREES NOMINAL
POINT LENGTH0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM
POINT STYLEFLAT
WIDTH BETWEEN FLATS1.438 INCHES NOMINAL
SURFACE TREATMENTPHOSPHATE OVERALL
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2A
THREAD LENGTH0.568 INCHES MINIMUM
THREAD QUANTITY PER INCH18
THREAD SERIES DESIGNATORUNC


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