Military Locknuts

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Military Locknuts

Abbott Interfast has been a leader in locknut sales since 1948. Abbott purchased a locknut manufacturer, Steloc Fastener Corporation, in its early years and began producing parts for the US Government. All products produced by Abbott Interfast conform and/or exceed specifications called out by MIL-N-25027, the general military specification for self-locking nuts.

MIL-N-25027 covers general requirements and each specific MS part number has further specifications, all of which we test for approval on each lot manufactured. The MS locknut series we produce are MS21044N, MS21083N and MS21078-3. We also supply locknuts to M45913 in both grades 5 & 8.

Abbott is also QPL approved by the Naval Testing Laboratory for locknuts. We have supplied the government with MS Locknuts in quantities that exceed twenty-five million since our approval.

Abbott was the very first licensee of Elastic Stop Nut Corp (ESNA). We use virgin DuPont Zytel 101 Nylon(Yellow) for our inserts and produce to ESNA’s tight tolerances. 

We are approved and produce the specific following Mil-Spec Nuts:

  • MS21044N06
  • MS21044N10
  • MS21078-3
  • MS21088N08
  • MS21044C08
  • MS21044N3
  • MS21044C3
  • MS21044N4
  • MS21083N08
  • MS21083N3
  • MS21044N6
  • MS21083N4
  • MS21044N8
  • MS21083N6


Additional Military Certifications & Standards: 

Abbott Interfast is ISO Certified as well as on the government's QSLM/QSLD listings. 

Both Abbott Interfast LLC and our machine shop, Abbott Metal Werks LLC are registered with the Office of Defense Trade Controls, Compliance and Registration Division in relation to Arms Export Control Act (AECA) and the International Traffic in Arms Regulations (ITAR).

View our Quality page for more information.

Military Locknuts
Mil Spec Lock Nuts
itar registered locknuts

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