NASM25027
Self-Locking Nuts
Mumbai · India
Why This Part Has Three Designations
This part’s naming history now spans three eras. First, it was published as MIL-N-25027 under the original single-letter military prefix system. Then, the 1990s-era DoD standardization moved it to MIL-DTL-25027 as a Detail Specification. More recently, government agencies stepped back from actively maintaining many of these long-standing MS, AN, and MIL documents, and the aerospace industry — organized through the National Aerospace Standards (NASM) committee under SAE — took over publishing and revising them going forward, converting the designation to NASM25027 while carrying the underlying Type I and Type II requirements forward essentially unchanged.
For a buyer, all three designations point to the same qualified nut family. Which name appears on a given drawing usually just reflects when that drawing was created or last revised — older tooling packages may still cite MIL-N-25027, mid-generation documentation might cite MIL-DTL-25027, and current or recently updated drawings increasingly cite NASM25027 directly. A part manufactured correctly to any of the three should be functionally identical.
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and we manufacture and document our self-locking nut range against all three designations, verified by prevailing torque and reuse-cycle testing under our ISO 9001:2015 quality system.
Where This Designation Genuinely Applies
Matches Current Industry Drawings
Current and recently revised engineering documentation increasingly cites NASM25027 directly.
Same Qualified Requirements Preserved
Type I and Type II temperature classes, prevailing torque, and reuse cycle requirements carried forward unchanged.
Actively Maintained Going Forward
Industry maintenance under NASM/SAE means the standard continues to be revised and kept current.
Full Traceability Across All Three Names
Complete documentation regardless of which of the three designations your drawing cites.
Full Designation History, One Family
MIL-N-25027
Our umbrella page under the original legacy single-letter designation, covering both temperature classes.
View MIL-N-25027 → 1990s DesignationMIL-DTL-25027
Our detail specification designation page, explaining the DoD numbering standardization era.
View MIL-DTL-25027 → Type I Detail — 250°FMIL-N-25027-1
Our dedicated detail page for the Type I nylon-insert variant, applicable under all three designations.
View MIL-N-25027-1 →Designation Timeline Quick Reference
Confirming which designation the drawing cites, and understanding they all trace to the same part, avoids unnecessary back-and-forth during quoting. This table is the quick reference we use with buyers before quoting.
| Aspect | NASM25027 (Current) | MIL-N-25027 / MIL-DTL-25027 (Prior) |
|---|---|---|
| Maintained By | Industry (NASM / SAE) | Formerly Department of Defense |
| Typical Drawing Age | Current / recently revised | Older tooling packages |
| Requirements | Type I / Type II preserved | Type I / Type II (identical) |
| Manufactured Part | Same qualified nut family | Same qualified nut family |
NASM25027 Specification Details
Materials We Manufacture In
- Carbon/Alloy Steel Cadmium / Zinc-Nickel Plated
- Stainless Steel 300 Series, Passivated
- Locking Insert Nylon (Type I)
- Finish Per Corrosion Environment
How Self-Locking Nuts Are Made
- Process Cold Formed / Machined
- Locking Feature Insert or Deformed Thread
- Testing Prevailing Torque / Reuse Cycles
- Quality Batch Sampled
Available Dimensions
- Nominal Size #4 – 1″ (Inch Series)
- Metric Equivalent Available to Drawing
- Type Type I (250°F) / Type II (450°F)
- Matching Standard NAS / AN Bolt Series
Application Areas
Wherever aerospace-grade vibration resistance and repeated-reuse reliability genuinely matter.
Aircraft Airframe Assembly
fastening applications
Engine & Nacelle Structure
for higher-temperature zones
Defense & Military Vehicle Assembly
vehicle applications
Rocket & Launch Vehicle Hardware
fastening requirements
Ground Support Equipment
ground equipment assembly
Marine & Naval Aviation Equipment
aviation procurement
High-Vibration Industrial Equipment
vibration-prone assemblies
General Aerospace-Grade Fastening
designations is specified
Standard Export Documentation
Prepared as standard practice for every NASM25027 self-locking nut shipment.
Mill Test Certificate (MTC)
Heat number, chemical composition, and mechanical property verification for every lot.
Prevailing Torque Test Records
Batch-level testing confirming locking torque falls within the specified range for the ordered type.
Certificate of Conformance
Confirms the shipment matches the purchase order type/material specification, citing any of the three designations as required.
Certificate of Origin (COO)
Confirms India as country of manufacture for destination customs purposes.
NABL Accredited Test Reports
Independent mechanical and dimensional testing available on request for critical applications.
Commercial Invoice & Packing List
Itemized value, Incoterm, and detailed carton/weight breakdown for customs clearance.
Internationally Recognised Standards Coverage
Related Fastener Grades & Materials
MIL-N-25027 Self-Locking Nuts
Our umbrella page under the original legacy designation, covering the same Type I/II family.
View MIL-N-25027 →MIL-DTL-25027 Self-Locking Nuts
Our detail specification designation page explaining the DoD numbering transition.
View MIL-DTL-25027 →NASM1312 Fastener Test Methods
Our fastener test methods reference, used to qualify this and every other aerospace nut we manufacture.
View NASM1312 →Fasteners Manufacturer & Exporter to the USA
Our broader capability manufacturing to ASTM/ASME and US federal/military standards.
View USA Export Guide →Whichever of the Three
Designations Your Drawing Cites
Tell us whether your drawing references NASM25027, MIL-DTL-25027, or MIL-N-25027 — we manufacture and document the same qualified part family either way. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Sales: +91 724 0000 733 · Support: +91 800 9315 333 · sales@akbarfasteners.in