MS51866-18

View detailed technical data, stock status, and sourcing information for: MS51866-18
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5310 Nuts and Washers

National Stock Number

5310-01-069-6345

Item Name Code

15893

Assigment Date

12/20/1978 (47 years ago)

0.384 inches minimum and 0.388 inches maximum pilot diameter, prevailing torque with nonmetallic insert or prevailing torque all metal design locking feature, 0.173 inches minimum and 0.203 inches maximum pilot length, 3b thread class, right-hand thread direction

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Class: 3b
Thread Direction: right-hand
Locking Feature: prevailing torque with nonmetallic insert or prevailing torque all metal design
Pilot Diameter: 0.384 inches minimum and 0.388 inches maximum
Pilot Length: 0.173 inches minimum and 0.203 inches maximum
Nut Height: 0.346 inches minimum and 0.406 inches maximum
Temp Rating: 250.0 fahrenheit maximum
Thread Series: unf
Thread Quantity Per Inch: 28
Nominal Thread Size: 0.250 inches
Material: steel corrosion resisting nut
Surface Treatment: cadmium and chromate overall except insert
Surface Treatment Document And Classification: qq-p-416 type 2 class 3 fed spec all treatment responses overall except insert

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
MS51866-18	Spline Self-Locking Nut

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 5310-01-069-6345?

The FSCG of the NSN 5310-01-069-6345 is 5310

Does the NSN 5310-01-069-6345 have a Schedule B code assigned?

Yes, the Schedule B code is 7318160000

Does NSN 5310-01-069-6345 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 5310-01-069-6345 contain precious materials?

Precious metal content is unknown

Does NSN 5310-01-069-6345 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 5310-01-069-6345 was assigned to the Federal Catalog?

It was assigned 47 years ago, on Wed, Dec 20, 1978