21556338

21556338 Cap Hexagon Head Screw
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Datasheet. 21556338 specification

Thread Direction
The direction of the thread when viewed axially. a right-hand thread winds in a clockwise direction while a left-hand thread winds in a counterclockwise direction.

RIGHT-Hand

Thread Length
A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.

2.500in. ⁓2-1/2"

Head Style
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.

hexagon

End Item Identification
The national stock number or the identification information of the end equipment for which the item is a part.

diesel engine, model alco 251

Nominal Thread Diameter
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.

0.500in. ⁓1/2"

Thread Quantity Per Inch
The number of threads on the item per linear inch measured on a line parallel to the thread axis.

13

Thread Series Designator
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.

unc

Answers.

What class is the thread series?

Unc

What is the thread quantity per inch?

13

What is the head style?

Hexagon

What is the thread length?

2.500 inches

What is the thread direction?

Right-hand

What is the NSN for 21556338?

5305-01-470-2626

What's the federal classification of 21556338?

FSC 5305 ⁓ Screws

NSN 5305-01-470-2626 SCREW,CAP,HEXAGON HEAD

Used on diesel engine, model alco 251. unc thread series 13 thread quantity per inch hexagon head style 2.500" thread length right-hand

NIIN
014702626
NIIN Date
12/13/99
Schedule B
 
Name Code
18257
FIIG
A003B0
DEMIL / ITAR
Uncontrolled item (Code A)
Hazmat
No hazard information available from HMIRS.
MSDS
N/A
Precious Metals
No precious metals
Enviromental
N/A
Electrostatic ESD & EMI
No ESD or EMI sensitivity

Major End Users Countries and entities

  • - Australia 

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21556338 / Screw,cap,hexagon headWhat is the formal definition of this item?

An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. the threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. the thread length being the controlled dimension, the grip length is not specified. a locking feature may be incorporated in the design of the head or threads. the head is not designed to be held or driven with an inserted driver or by the thumb and fingers. excludes bolt,machine; bolt,externally relieved body; bolt,internal wrenching; and screw,cap,socket head.