MS51866-18C

MS5186618C Self-locking Spline Nut

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Datasheet. MS51866-18C specification

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

3b

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 all metal design or prevailing torque with nonmetallic insert

Pilot Diameter
The length of a straight line which passes through the center of that portion used to guide the item and terminates at the circumference.

0.384in. and 0.388in.

Pilot Length
The length of the pilot,which is the unthreaded portion beyond the thread used to guide the item.

0.173in. and 0.203in.

Lubrication
A substance designed to provide a reduction of friction between the two surfaces in contact.

dry film lubricant

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

spline

Nut Diameter

0.548in. and 0.578in.

Nut Height

0.376in. ⁓25/64"

Temp Rating
A value which expresses the degree of heat or cold as applied to the operation,or limitation of operation,of an item.

250.0 deg fahrenheit

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.

28

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

0.250in. ⁓1/4"

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

steel comp 301 nut or steel comp 302 nut or steel comp 302b nut or steel comp 303 nut or steel comp 303se nut or steel comp 304 nut or steel comp 304l nut or steel comp 305 nut or steel comp 308 nut or steel comp 309 nut or steel comp 309s nut or steel comp 310 nut or steel comp 310s nut or steel comp 314 nut or steel comp 316 nut or steel comp 316l nut or steel comp 317 nut or steel comp 321 nut or steel comp 347 nut or steel comp 348 nut or steel comp 384 nut or steel comp 385 nut

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.

passivate except insert

Surface Treatment Document And Classification
The specification,standard,or manufacturers reference,and the classification designation,such as type,class,grade,and the like,that identifies the surface treatment material.

QQ-P-35 ty 2 fed spec single treatment response except insert

Answers.

What quantity is this sold in?

1EA

What material is the self-locking spline nut made of ?

Steel comp 301 nut or steel comp 302 nut or steel comp 302b nut or steel comp 303 nut or steel comp 303se nut or steel comp 304 nut or steel comp 304l nut or steel comp 305 nut or steel comp 308 nut or steel comp 309 nut or steel comp 309s nut or steel comp 310 nut or steel comp 310s nut or steel comp 314 nut or steel comp 316 nut or steel comp 316l nut or steel comp 317 nut or steel comp 321 nut or steel comp 347 nut or steel comp 348 nut or steel comp 384 nut or steel comp 385 nut

What is the thread quantity per inch?

28

What is the thread direction?

Right-hand

What is the thread class?

3b

What is the NSN for MS51866-18C?

5310-01-454-1291

How is this classified for shipping?

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

What's the federal classification of MS51866-18C?

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 5310-01-454-1291 NUT,SELF-LOCKING,SPLINE

passivate except insert surface treated 28 thread quantity per inch right-hand 3b thread class

NIIN
014541291
NIIN Date
03/20/98
Schedule B
7318160000 
Name Code
15893
FIIG
A021A0
Item Weight
0.000lbs
Item Dimensions
--
QUP
Historical Price
$287.45 EA
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

  • - Department of The Army 

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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
Trailers, vehicles, machinery, shop and warehouse equipment and supplies including special tools and equipment, ground servicing 
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

MS51866-18C / Nut,self-locking,splineWhat is the formal definition of this item?

A nut having an externally splined sleeve, which holds it in position when forced into a hole of slightly smaller diameter. an integral feature is incorporated for locking.