National Item Identification Number

00-638-8440
006388440
5305-00-638-8440
5305006388440

National Stock Number

Item Name

THUMBSCREW

Federal Supply Class

5305

Description

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).

Commercial and Government Entity Code (Supplier Data)

---

Reference Numbers (Part Numbers)

8849338-1
8849338-1

Required Categories

THREAD SERIES DESIGNATOR
NOMINAL THREAD DIAMETER
THREAD QUANTITY PER INCH
THR

Required Description

UNC
0.438 INCHES
14
2A
RIGHT-HAND
0.250 INCHES MINIMUM
0.531 INCHES NOMINA