18998R

View detailed technical data, stock status, and sourcing information for: 18998R
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5310 Nuts and Washers

National Stock Number

5310-00-522-5957

Item Name Code

13393

Assigment Date

01/01/1963 (63 years ago)

round peripheral shape style, 0.059 inches minimum and 0.065 inches maximum thickness, 1.281 inches nominal hole diameter, round center hole shape style, rectangular cross-sectional shape style

Product Characteristics

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

Cross-Sectional Shape Style: rectangular
Hole Diameter: 1.281 inches nominal
Peripheral Shape Style: round
Center Hole Shape Style: round
Thickness: 0.059 inches minimum and 0.065 inches maximum
Overall Diameter: 1.550 inches minimum and 1.560 inches maximum
Minimum Tensile Strength: 250 pounds per square inch
Hardness Rating: 60.0 shore durometer a minimum and 80.0 shore durometer a maximum
Material: cork overall
Material Document And Classification: mil-g-112803,no. +2255-a mil spec single material response overall

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
2530-00-537-0301	No Name Available	01/01/1963

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
18998R	Flat Washer
2144288	Flat Washer
24W023	Flat Washer
364628	Flat Washer
5225957	Flat Washer
BK16640	Flat Washer

FAQs

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

What is the FSCG of the NSN 5310-00-522-5957?

The FSCG of the NSN 5310-00-522-5957 is 5310

Does the NSN 5310-00-522-5957 have a Schedule B code assigned?

Yes, the Schedule B code is 4503900000

Does NSN 5310-00-522-5957 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 5310-00-522-5957 contain precious materials?

Precious metal content is unknown

Does NSN 5310-00-522-5957 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 5310-00-522-5957 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963