991-4-00172-001

991400172001 Hex Castellated Self-locking Nut

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Datasheet. 991-4-00172-001 specification

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

2b

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

Locking Feature
An element inserted into the fastener,or a design feature,that enables the fastener to effectively resist vibration and rotation.

prevailing torque with nonmetallic insert

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

castellated, hexagon

Nut Height

0.145in. ⁓5/32"

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

0.207in. ⁓7/32"

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

unf

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

72

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

0.073in. ⁓5/64"

Bearing Surface Type
Indicates the type of bearing surface.

chamfered

Part Name Assigned By Controlling Agency
The name assigned to the item by the government agency or commercial organization controlling the design of the item.

navy special project

Material
The chemical compound or mechanical mixture properties of which the item is fabricated.

plastic locking insert

Material
The chemical compound or mechanical mixture properties of which the item is fabricated.

steel except insert

Surface Treatment
The metallic,nonmetallic,and/or chemical properties with which the item is plated,dipped,and/or coated.the treatment is designed to protect the surface(s) and cannot be wiped off.

cadmium except insert and chromate except insert

Answers.

What material is the hex castellated self-locking nut made of ?

Steel except insert

What material is the hex castellated self-locking nut made of ?

Plastic locking insert

What is the thread quantity per inch?

72

What is the thread direction?

Right-hand

What is the thread class?

2b

What is the NSN for 991-4-00172-001?

5310-01-048-5329

How is this classified for shipping?

Schedule B number: 7318160000
nmfc 093486
Nuts of iron or steel

What's the federal classification of 991-4-00172-001?

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 5310-01-048-5329 NUT,SELF-LOCKING,CASTELLATED,HEX

cadmium except insert surface treated navy special project 72 thread quantity per inch right-hand 2b thread class

NIIN
010485329
NIIN Date
09/28/77
Schedule B
7318160000 
Name Code
29725
FIIG
A021A0
QUP
 
Historical Price
$20.35 EA
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

  • - Department of The Navy 

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Shipping Information

Special Handling
Other or no special handling required (sh) 
LTL (less than a truck load rating)
Rating variable 
LCL (less than a car load rating)
Unknown
Special Cargo
No special type of cargo code applicable 
Air Freight (Minimum cargo door size required)
Shipment is not a consolidation and does not exceed 84 inches in any dimension. 
Customs Requirement Classification
Construction materials: includes paint and related materials, prefabricated building, wood products, metal and composition mater 
Commodity (for shipments via water)
Bolts or nuts (iron or steel),(less than 35 feet) 
NMFC (national motor freight code)
093486 BOLTS,NUTS OR SCREWS, NOI (SUB 3) 
UFC (universal freight code)
48950 

Similar by Design Other nuts with similar characteristics

Nothing similar to this part number was found in our inventory

991-4-00172-001 / Nut,self-locking,castellated,hexWhat is the formal definition of this item?

A nut having 6 flat sides, flat on the bottom and having a slotted cylindrical or dome shaped upper portion. an integral feature is incorporated for locking on the threads of a mating member. the slots when used in conjunction with a solid or split (cotter) pin, act as an extra "fail safe" feature in critical applications. excludes nut (1), self-locking, slotted, hexagon.