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 grade 5 & 8.
Abbott is also QPL approved from 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. Abbott-Interfast is ISO Certified as well as on the governments QSLM/QSLD listings.
We are approved and produce the specific following MS Nuts.