3b

right-hand

slotted, hexagon

0.562 inches nominal

0.738 inches minimum and 0.752 inches maximum

unf

20

0.500 inches

spcl

washer faced

material per mil-s-5000 or mil-s-6049; nut has rockwell hardness of c34-c39 in accordance with mil-h-6875 class a; 100% magnetic particle inspection per mil-i-6868 performed by both cir. and long. method, the wet or dry process with either fluor. or non-fluor. shall be used, no cracks allowed; nuts finished per qq-p-416 type ii cl 3; baked at 375 deg f for 23 hours after plating; embrittlement test per qq-p-416 does not apply; surface finished shall be 125 unless otherwise specified

steel overall

cadmium overall

items are being coded as critical to insure source inspection will be performed at the point of manufacture, prior to material receipt by the us navy or other dod components. these items are piece parts or end items in support of vital military hardware necessary to sustain the successful mission of the ships, submarines, and shore stations of the us navy. critical features including, but not limited to, dimensions, tolerances/clearances, electronic characteristics, and metallurgical properties will bespecified for government q ar (quality assurance representatives) to insure the highest possible degree of quality and reliability of these parts being delivered under navicp contracts

qq-p-416,ty 2,cl 3 fed spec single treatment response overall

Item does not contain precious metal.

The item is a non-aviation critical safety item (csi) whose failure will result in serious damage to equipment or serious injury or death to personnel.

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

0001859