5305-01-050-9648, THUMBSCREW

National Stock Number:
5305-01-050-9648

Federal Supply Class:
5305

National Item Identification Number:
010509648

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:

10882427

19207

U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM

Techincal Specification:

DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	0.688 INCHES MINIMUM AND 0.812 INCHES MAXIMUM
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY	1
FASTENER LENGTH	0.969 INCHES MINIMUM AND 1.031 INCHES MAXIMUM
FIRST DIAMETER FROM HEAD	0.172 INCHES MINIMUM AND 0.188 INCHES MAXIMUM
HEAD HEIGHT	0.610 INCHES MINIMUM AND 0.640 INCHES MAXIMUM
HEAD STYLE	THUMB NO. 3
MATERIAL	STEEL OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES
POINT STYLE	FLAT
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM AND CHROMATE OVERALL
THREAD LENGTH	0.219 INCHES MINIMUM AND 0.281 INCHES MAXIMUM
THREAD CLASS	2A
THREAD DIRECTION	RIGHT-HAND
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH	20
WIDTH BETWEEN FLATS	0.520 INCHES MINIMUM AND 0.550 INCHES MAXIMUM

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