AN345 nut — plain hex nut, non-structural, fine thread

Notes from the standard

• Part number: AN345- (alloy steel), AN345C (corrosion-resistant steel), AN345B (brass) or AN345DD (aluminum alloy), followed by the dash number of the size: AN345-10, AN345C10, AN345B10.
• Cancelled after 31 Mar 1970, except the aluminum alloy nuts and dash numbers 1, 3 and 5 in all materials. The interchangeability table on MS35650 gives the substitute parts.
• No. 1, 2, 3, 4, 5, 6 and 8 sizes: not recommended for new design.
• Aluminum alloy nuts: inactive for design after 19 July 1955.
• An optional chamfer may be used in lieu of the washer face. Chamfer 30° ±5°.
• Thread T per MIL-S-7742, countersunk 110° to the O.D. of the thread.
• Class 2 threads may be substituted for class 2B threads until existing stocks of nuts with class 2 threads are exhausted.
• B is a reference dimension, for design purposes only and not an inspection requirement.
• H is measured at a point approximately halfway between the minor diameter of the hole and the flat of the nut.
• For aluminum alloy nuts, tolerances on A may conform to the applicable material specifications for bar and rod.
• Nuts shall be free of all loose or hanging burrs or slivers which might become dislodged under usage.
• In case of conflict, the requirements of this standard take precedence over those of MIL-S-933.
• Approved data governs. Use the part the SRM, drawing or IPC calls for.