MIL-DTL-25027 — Self-Locking Nut, 250°F / 450°F / 800°F (Legacy)
MIL-DTL-25027 covered self-locking nuts for service at 250°F, 450°F, and 800°F depending on base material. Its final Revision H (15 August 1997) superseded the earlier MIL-N-25027G, and the entire document was itself superseded on December 14, 1999 by NASM25027, which is the active governing specification today.
At a Glance
Overview
MIL-DTL-25027 was the direct successor to MIL-N-25027, covering self-locking nuts rated for continuous service at 250°F, 450°F, or 800°F depending on the base material used — copper-base and aluminum alloys were limited to 250°F, corrosion resistant steel could reach up to 800°F, and non-corrosion-resistant steel could reach 250°F or 450°F.
Its final issue, Revision H, was published August 15, 1997. The entire specification, along with its predecessor MIL-N-25027, was formally superseded on December 14, 1999 when the Department of Defense adopted NASM25027 as the governing document, transferring maintenance of the self-locking nut specification to the Aerospace Industries Association's NAS/Military (NASM) document family.
- Products qualified under MIL-DTL-25027 through certified government qualification tests are considered qualified under the current NASM25027 without retesting.
- Any new procurement or design should cite NASM25027 directly rather than MIL-DTL-25027.
Specification Lineage
| Document | Status |
|---|---|
| MIL-N-25027 (through Rev. G) | Superseded by MIL-DTL-25027 |
| MIL-DTL-25027 (Rev. H, 1997) | Superseded by NASM25027 |
| NASM25027 (1999–present) | Active, current governing document |
MIL-DTL-25027 is superseded. Current and future procurement should reference NASM25027, which covers the same self-locking nut family under active maintenance by the Aerospace Industries Association. This page is retained for legacy drawing cross-reference only.
MIL-DTL-25027 — Frequently Asked Questions
Is MIL-DTL-25027 the same nut as NASM25027?
Functionally yes — NASM25027 is the direct successor document and covers the same self-locking nut family, temperature classes, and material options. Products qualified under MIL-DTL-25027 carry over as qualified under NASM25027.
Why do some drawings still cite MIL-DTL-25027 or MIL-N-25027?
Older engineering drawings often retain the specification number in effect when they were originally released. For current procurement, cross-reference to NASM25027.
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