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MS25082 : Mil-Spec Hardware

MS25082 : Mil-Spec Hardware Specification
Nut, Plain, Hexagon Electrical – Thin

MS25082 CAD DrawingClick on drawing for larger view


1. MATERIALS: Steel compositions in accordance with FED-STD-66, 55 KSI minimum tensile strength (sulfur or phosphorus shall not exceed 050 by weight for nuts heat treated to Rockwell hardness C36 or greater)

Brass composition 360 with H02 temper (UNS C36000) in accordance with ASTM B16

CRES (stainless steel) composition 303 (UNS S30300) in accordance with ASTM A581 or A582


  • Steel nuts shall be cadmium plated per QQ-P-416, Type II, Class 2
  • Brass nuts shall be silver plated per QQ-S-365 or Black Oxide Finish per MIL-F-495
  • CRES nuts shall be passivated per QQ-P-35

3. Threads shall be in accordance with FED-STD-H28/2 Thread acceptability shall be in accordance with FED-0STD-H28/20, System 21

4. Break all sharp edges and remove all burrs. The chamfer or countersink at both edges of tapped hole shall not be greater than 005 inch

5. Dimensions are in inches unless otherwise specified. Tolerance for angles shall be ?5?

6. BEARING SURFACE: The diameter of the circle of the bearing surface shall be the maximum across flats dimension within a tolerance of minus three percent. The bearing surface shall be perpendicular to the thread axis within 2? for nuts 625 inch and smaller and 1? for nuts larger than 625 inch.

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

  • Example: MS25082 – 1
  • MS25082 Basic Number
  • 1 Dash Number

MS25082 – 1 indicates steel, cadmium plated, 138 inch nominal threaded, class 28, plain hexagon nut


  • 1. A and B dimensional ranges have been revised on some of the dash numbers to conform with ANSI B18 2 2 and ANSI B18 6 3
  • 2. For brass nuts manufactured from milled bar only, the tabulated maximum width across flats dimensions may be exceeded to conform with the commercial tolerances of drawn or rolled bar stock material. The normal bar size used shall be the closest commercially available size to the specified basic width across the flats, and across corners of the nut
  • 3. Nuts manufactured prior to revision “P” are acceptable up to two years from date of revision “P”
  • 4. Part numbers MS25082-9 and MS25082-B9 were cancelled after 8 October 1968 and replaced by MS25082-11 and MS25082-B11 respectively
  • 5. In the event of a conflict between the text of this document and the references cited herein the text of this document shall take precedence
  • 6. Unless otherwise specified referenced documents are those in effect at the time of solicitation

Need the Spec?

Click here to download MS25082 Specification
(PDF Format).

Great Lakes Fasteners
2204 East Enterprise Parkway
Twinsburg, Ohio 44087

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Copyright Great Lakes Fasteners, Inc. 2008

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