5305-01-450-3253, THUMBSCREW

National Stock Number:
5305-01-450-3253

Federal Supply Class:
5305

National Item Identification Number:
014503253

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:

12981727-1

19200

US ARMY ARDEC RDECOM

Techincal Specification:

DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER	3.710 INCHES NOMINAL
FASTENER LENGTH	3.700 INCHES MINIMUM AND 3.720 INCHES MAXIMUM
HEAD DIAMETER	0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM
HEAD HEIGHT	2.020 INCHES MINIMUM AND 2.040 INCHES MAXIMUM
HEAD STYLE	KNURLED NO. 6
MATERIAL DOCUMENT AND CLASSIFICATION	ASTM A581, A582 OR AMS 5640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP 303 OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES
NONSTANDARD THREAD PITCH DIAMETER	+0.2139 TO 0.2175 INCHES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	MIL-STD-171, PARA 5.4.1 MIL STD SINGLE TREATMENT RESPONSE OVERALL
THREAD CLASS	2A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM
THREAD QUANTITY PER INCH	20
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL COARSE (UNC)

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