5305-00-410-5070, THUMBSCREW

National Stock Number:
5305-00-410-5070

Federal Supply Class:
5305

National Item Identification Number:
004105070

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:

1C5645P14

07482

GENERAL ELECTRIC COMPANY

Techincal Specification:

FASTENER LENGTH	1.320 INCHES MINIMUM AND 1.420 INCHES MAXIMUM
HARDNESS RATING	28.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
HEAD DIAMETER	0.720 INCHES MINIMUM AND 0.780 INCHES MAXIMUM
HEAD HEIGHT	0.220 INCHES MINIMUM AND 0.280 INCHES MAXIMUM
HEAD STYLE	KNURLED NO. 1
MATERIAL DOCUMENT AND CLASSIFICATION	SAE ASSN STD ALL MATERIAL RESPONSES OVERALL
MATERIAL	STEEL COMP 4130 OR STEEL COMP 4140 OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES
SHOULDER DIAMETER	0.430 INCHES MINIMUM AND 0.460 INCHES MAXIMUM FIRST SHOULDER
SHOULDER LENGTH	0.300 INCHES MINIMUM AND 0.440 INCHES MAXIMUM FIRST SHOULDER
SHOULDER SHAPE	ROUND FIRST SHOULDER
POINT STYLE	FLAT
THREAD CLASS	2A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.300 INCHES MINIMUM AND 0.400 INCHES MAXIMUM
THREAD QUANTITY PER INCH	20
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL COARSE (UNC)

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