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National Stock Number:
5305-01-498-1978
Federal Supply Class:
5305
National Item Identification Number:
014981978
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:
| MHC526 | 0VP52 | FINCANTIERI MARINE SYSTEMS NORTH AMERICA, INC. | | MHC531 PC 7 | 0VP52 | FINCANTIERI MARINE SYSTEMS NORTH AMERICA, INC. |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNC | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 20 | | THREAD CLASS | 2A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.750 INCHES NOMINAL | | FASTENER LENGTH | 0.690 INCHES MINIMUM AND | | 0.810 INCHES MAXIMUM | | MATERIAL | PLASTIC HEAD | | STEEL FASTENER | | HEAD STYLE | STAR KNOB | | HEAD HEIGHT | 0.850 INCHES NOMINAL | | WIDTH BETWEEN FLATS | 1.375 INCHES NOMINAL |
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