MS21258Z20

View detailed technical data, stock status, and sourcing information for: MS21258Z20
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Federal Supply Group

Hardware and Abrasives

Federal Supply Classification

5310 Nuts and Washers

National Stock Number

5310-00-849-8351

Item Name Code

01869

Assigment Date

01/11/1967 (59 years ago)

A nonmetallic circular item with an aperature, having a solid round cross-section. They are used primarily for sealing. For items with other than round cross section, see packing,preformed. For noncircular items with a round cross-section, see seal,nonmetallic round section and rubber,round section.

0.541 inches minimum and 0.551 inches maximum distance from centerline to top of internal key, 1 internal key quantity, 1.750 inches minimum and 1.780 inches maximum outside diameter, 0.146 inches minimum and 0.166 inches maximum internal straight key width, 1.255 inches minimum and 1.265 inches maximum hole diameter

Product Characteristics

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

Hole Diameter: 1.255 inches minimum and 1.265 inches maximum
Outside Diameter: 1.750 inches minimum and 1.780 inches maximum
Internal Straight Key Width: 0.146 inches minimum and 0.166 inches maximum
Distance From Centerline To Top Of Internal Key: 0.541 inches minimum and 0.551 inches maximum
Internal Key Quantity: 1
Material Thickness: 0.120 inches minimum and 0.130 inches maximum
Material: steel comp 1018 or steel comp 1020 or steel comp 1025 overall
Material Document And Classification: astm a108 assn std all material responses overall
Surface Treatment: zinc and chromate overall
Surface Treatment Document And Classification: astm b633,type 2 assn std single treatment response overall
Style Designator: key

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
5310-00-222-0711	No Name Available	07/01/1968

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
AN7503-20	Key Washer
MS21258Z20	Key Washer

FAQs

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

What is the FSCG of the NSN 5310-00-849-8351?

The FSCG of the NSN 5310-00-849-8351 is 5310

Does the NSN 5310-00-849-8351 have a Schedule B code assigned?

Yes, the Schedule B code is 7318220000

Does NSN 5310-00-849-8351 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 5310-00-849-8351 contain precious materials?

Precious metal content is unknown

Does NSN 5310-00-849-8351 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 5310-00-849-8351 was assigned to the Federal Catalog?

It was assigned 59 years ago, on Wed, Jan 11, 1967