5305-01-088-7955, THUMBSCREW

National Stock Number:
5305-01-088-7955

Federal Supply Class:
5305

National Item Identification Number:
010887955

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:

810AS1275

30003

NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER

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	0.630 INCHES NOMINAL
FASTENER LENGTH	1.000 INCHES NOMINAL
MATERIAL	STEEL COMP 303 OR
	STEEL COMP 303SE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	ASTM A582 ASSN STD ALL MATERIAL RESPONSES OVERALL
SURFACE TREATMENT	PASSIVATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 CL1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
HEAD STYLE	KNURLED NO. 4
HEAD DIAMETER	0.500 INCHES NOMINAL
HEAD HEIGHT	0.250 INCHES NOMINAL
POINT STYLE	FLAT
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY	4
FIRST DIAMETER FROM HEAD	0.380 INCHES NOMINAL
SECOND DIAMETER FROM HEAD	0.280 INCHES NOMINAL
THIRD DIAMETER FROM HEAD	0.380 INCHES NOMINAL
FOURTH DIAMETER FROM HEAD	0.175 INCHES MINIMUM AND
	0.185 INCHES MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	0.178 INCHES NOMINAL
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER	0.240 INCHES NOMINAL
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER	0.303 INCHES NOMINAL
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FOURTH DIAMETER	0.373 INCHES NOMINAL

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