18889-1

188891 Plain Hexagon Nut

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Datasheet. 18889-1 specification

Thread Class
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.

2a

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

Nut Style
The style designation indicating the configuration that most nearly corresponds to the appearance of the nut.

hexagon

Width Across Flats
The shortest straight line between flats,perpendicular to the height.

0.625in. ⁓5/8"

Thread Series
A designation indicating the diameter-pitch combination and the number of threads per measurement scale applied to a series of diameters.

unef

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

28

Nominal Thread Size
A designation that is used for the purpose of general identification of the thread.

0.500in. ⁓1/2"

Bearing Surface Type
Indicates the type of bearing surface.

chamfered

Special Features
Those unusual or unique characteristics or qualities of an item not covered in the other requirements and which are determined to be essential for identification.

keyway 0.069 in. min 0.075 in. max w, 0.035 in. min 0.039 in. max dp, 3 lockwire holes 0.042 in. min 0.052 in. max dia

Answers.

What is the thread quantity per inch?

28

What is the thread direction?

Right-hand

What is the thread class?

2a

What is the NSN for 18889-1?

5310-01-066-1511

What's the federal classification of 18889-1?

FSC 5310 ⁓ Nuts and washers

Note-nuts and washers, including specially designed, are to be classified in this fsc. a. nuts are a small metal block made in a variety of shapes such as square and hexagonal which is drilled and internally threaded. b. washers are a perforated piece of metal, leather, or other materials of various shapes or forms. they are used primarily as a seat for a bolt, nut, screw, rivet or nail to distribute pressure and prevent endwise motion over an area and/or to prevent movement between two parts by means of restraining features created by the shape of its edges.

Excluding bearing thrust washers (fsc 3120); shims (fsc 5365); ring spacers (fsc 5365); plate spacers (fsc 5365); lock rings (fsc 5365).

NSN 5310-01-066-1511 NUT,PLAIN,HEXAGON

keyway 0.069 in. min 0.075 in. max w, 0.035 in. min 0.039 in. max dp, 3 lockwire holes 0.042 in. min 0.052 in. max dia 28 thread quantity per inch right-hand 2a thread class

NIIN
010661511
NIIN Date
10/03/78
Schedule B
 
Name Code
01857
FIIG
A021A0
DEMIL / ITAR
Uncontrolled item (Code A)
Hazmat
No hazard information available from HMIRS.
MSDS
N/A
Precious Metals
Metal content unknown
Enviromental
N/A
Electrostatic ESD & EMI
No ESD or EMI sensitivity

Other Part Numbers Parts with same form, fit, and function by other manufacturers

Major End Users Countries and entities

  • - Germany 
  • - United Kingdom 
  • - Italy 

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Nothing similar to this part number was found in our inventory

18889-1 / Nut,plain,hexagonWhat is the formal definition of this item?

A nut, flat on top and bottom having 6 flat sides. for items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. see also locknut, tube fitting. for items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)