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MS21047 : Mil-Spec Hardware

MS21047 : Mil-Spec Hardware Specification
Nut, Self-Locking, Plate, Two-Lug, Low Height, Steel, 125 KSI, Ftu, 450°F

MS21047 CAD DrawingClick on drawing for larger view


1. MATERIAL: Carbon steel, compositions 1035 (UNS G10350) 1040 (UNS G10400) 1050 (UNS G10500) in accordance with ASTM A827 or QQ-S-700 Composition 1042 (UNS G10420) in accordance with ASTM A29

2. FINISH: Cadmium plate in accordance with QQ-P-416 Type II, Class 2. For dry film lubricated nuts the type and class are optional if the nuts meet the salt spray requirements of QQ-P-416 Type II

3. DIMENSIONING AND TOLERANCING: Dimensioning and tolerancing shall be in accordance with ANSI Y14 SM


5. THREADS: Threads before lubrication in accordance with MIL-S-8879

6. SURFACE TEXTURE: Surface texture unless otherwise specified shall not exceed 125 microinches, in accordance with ANSI/ASME B46 1

7. LUBRICANT: Dry film lubricant approved in accordance with MIL-N-25027 Non-dry film lubricants shall be soluble in the cleaner specified in MIL-S-8802

8. EDGES: Break all sharp edges and remove all burrs

9. COUNTERBORE/COUNTERSINK: On size 164 and larger counterbore thread ā€œDā€ diameter x 062 deep minimum thread relief, on size 138 and smaller countersink to ā€œPā€ diameter within the limits of D, P and M

10. PART NUMBER: The part number shall consist of the basic MS number followed by a dash number from Table 1

Example MS21047L4K

  • MS21047 Basic MS Number
  • L4K Dash Number

MS21047L4K indicates nut self-locking, plate two lug low height, steel 125 KSI Ftu 450?F 250-28UNJF-38, dry film lubricant countersunk or dimpled holes


  • 1. All dimensions are in inches
  • 2. In the event of a conflict between the text of this standard and the references cited herein the text of this standard shall take precedence
  • 3. Referenced government (or non-government) documents of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DODISS) specified in the solicitation form a part of this standard to the extend specified herein
  • 4. Design and usage limitations these nuts are designed to develop the tensile strength of bolts and screws with an ultimate tensile strength of 125 KSI based on the cross section area at the basic root diameter of the threads. These nuts are designed to be used on JA external threads. These nuts shall be used in accordance with the limitations of MS33588. Only nuts which there are qualified products listed on QPL 25027 shall be used.
  • 5. MS21047 supersedes AN362, AN365 NAS680 NAS1023 in part

Interchangeability Relationship

MS21047 nuts can universally replace AN362 AN366 NAS680 and NAS1023 nuts of like material Thread size lubricant (dry film or non-dry film lubricant) and fastening method (plain rivet holes dimpled or countersunk rivet holes) but these AN362, AN366 NAS680, and NAS1023 nuts cannot universally replace MS21047 nuts.

Need the Spec?

Click here to download MS21047 Specification
(PDF Format).

Great Lakes Fasteners
2204 East Enterprise Parkway
Twinsburg, Ohio 44087

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GLFTechnical Fastener Supply specializes in a wide range of industrial and military specification (MIL Spec) fasteners; including MS fasteners, AN Fasteners, and NAS Fasteners.