Home | MS21299 Washers - Mil-Spec Washers for Aerospace & Defense

MS21299 Washers - Mil-Spec Washers for Aerospace & Defense

MS21299 / NASM21299 washers are military standard flat washers manufactured to Military Standard specification MS21299 in cadmium-plated steel for aerospace and defense fastener assemblies. Superior Washer produces MS21299 mil-spec washers with DFARS-compliant materials and complete material certifications under our ISO 9001:2015 certified QMS.

MS21299 part numbers in stock include MS21299-3, MS21299-4, MS21299-5, MS21299-6, MS21299-7, MS21299-8, MS21299-10, MS21299-12, MS21299-C3, and MS21299-C5. All MS21299 washers are manufactured in the U.S.A. with full material traceability.

  • MS21299 / NASM21299 mil-spec washers in cadmium-plated steel
  • DFARS-compliant materials with full certifications
  • ISO 9001:2015 certified | Made in the U.S.A.
  • Standard and C-series dash numbers in stock

Showing 1–10 of 10 products

SKU ID OD Thickness Drawing Quantity

MS21299-10

ID 0.627
OD 1.182
Thickness 0.062
Drawing REV 4
Quantity

MS21299-12

ID 0.752
OD 1.423
Thickness 0.062
Drawing REV 4
Quantity

MS21299-3

ID 0.191
OD 0.377
Thickness 0.062
Drawing REV 4
Quantity

MS21299-4

ID 0.251
OD 0.481
Thickness 0.062
Drawing REV 4
Quantity

MS21299-5

ID 0.314
OD 0.588
Thickness 0.062
Drawing REV 4
Quantity

MS21299-6

ID 0.376
OD 0.702
Thickness 0.062
Drawing REV 4
Quantity

MS21299-7

ID 0.439
OD 0.821
Thickness 0.062
Drawing REV 4
Quantity

MS21299-8

ID 0.501
OD 0.94
Thickness 0.062
Drawing REV 4
Quantity

MS21299-C3

ID 0.191
OD 0.377
Thickness 0.057
Drawing REV 4
Quantity

MS21299-C5

ID 0.314
OD 0.588
Thickness 0.057
Drawing REV 4
Quantity

See the MS21299 spec for drawing revision REV 4, size range, and DFARS documentation. MS21299 / NASM21299 is a military standard flat washer specification covering standard and C-series configurations in alloy steel 4130 with cadmium finish, with passivated stainless steel variants also available. Both alloy steel and stainless steel are DFARS-compliant specialty metals. Superior Washer specializes in bulk and large-quantity MS21299 washer orders, with the production capacity and inventory depth to support high-volume defense and aerospace procurement. MS21299 washers are part of Superior Washer's full catalog of military flat washers. Related specifications: MS15795 and AN960.

What are MS21299 washers?

MS21299 / NASM21299 washers are military standard flat washers manufactured to Military Standard specification MS21299 for aerospace and defense fastener assemblies. NASM21299 is the current active designation for this specification. Superior Washer stocks both the standard dash-number series (MS21299-3 through MS21299-12) and the C-series configurations (MS21299-C3, MS21299-C5).

What is the difference between MS21299 and NASM21299?

NASM21299 is the SAE Aerospace equivalent of the original MS21299 specification, maintained by the Aerospace Industries Association following the cancellation of many original MS-series documents. The two designations are technically interchangeable. Superior Washer manufactures washers conforming to both designations.

What material are MS21299 washers made from?

MS21299 washers are manufactured from alloy steel 4130 with cadmium finish. Passivated stainless steel variants are also available, typically denoted with a K suffix. Both alloy steel and stainless steel are DFARS-compliant specialty metals. Material certifications and traceability documentation are available upon request for all MS21299 configurations.

What drawing revision are your MS21299 washers manufactured to?

Superior Washer manufactures MS21299 washers to drawing REV 4 across all sizes and series. If your purchase order or contract specifies a drawing revision, include that in your quote request and we will confirm availability.

What MS21299 part numbers do you stock?

Superior Washer stocks 10 MS21299 configurations: MS21299-3, MS21299-4, MS21299-5, MS21299-6, MS21299-7, MS21299-8, MS21299-10, MS21299-12, MS21299-C3, and MS21299-C5. Contact us for stainless K-suffix variants or quantities not shown in the catalog.

Are your MS21299 washers made in the USA with DFARS-compliant materials?

Yes. All MS21299 washers are manufactured at our U.S. facilities in Hauppauge, NY and Rock Hill, SC under our ISO 9001:2015 certified Quality Management System. Alloy steel 4130 and stainless steel are both DFARS-compliant specialty metals, and full documentation is available upon request to support defense and aerospace contract requirements.

Can you fulfill bulk and large-quantity MS21299 washer orders?

Yes. Superior Washer specializes in bulk and large-quantity MS21299 washer orders for defense contractors, aerospace OEMs, and industrial distributors. With extensive raw material inventory and more than 100 power presses across two U.S. manufacturing facilities, we have the production capacity to fulfill high-volume MS21299 orders across all sizes and series. Contact us with your part number, quantity, and any DFARS or certification requirements for a bulk order quote.