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cres 17-4Ph per assocstandard ams 5643; hexagon shape; 1.480 in. min 1.520 in. max across flats; 0.630in. min 0.650 in. max nut height; castellated with 8 slots equally spaced, 0.120in. min 0.150 in. max w x 0.140 in. min 0.160 in. max deep; thread series un; nom thread size 1.250 in.; threads per in. 20; thread cl 2b; thread direction right hand; thread length 0.260 in. min, 0.300 in. max; hardness rating rockwell C35.0 min to 42.0 max; internal conical face 29.0 deg min, 31 deg max, with surf roughness 63.0 microinches; axial hole in base end 0.930 in. min by 0.950 in. max dia; both external edgeschamfered 10.0 deg min, 20.0 deg max extending to a dia 1.450 in. min, 1.480 max from axis; magnetic particle inspection per spec EMS52308, fscm 99193
1EA
Schedule B number: 7318160000
nmfc 093486
Nuts of iron or steel
FSC 5310 ⁓ Nuts and washers
Note-nuts and washers, including specially designed, are to be classified in this fsc. a. nuts are a small metal block made in a variety of shapes such as square and hexagonal which is drilled and internally threaded. b. washers are a perforated piece of metal, leather, or other materials of various shapes or forms. they are used primarily as a seat for a bolt, nut, screw, rivet or nail to distribute pressure and prevent endwise motion over an area and/or to prevent movement between two parts by means of restraining features created by the shape of its edges.
Excluding bearing thrust washers (fsc 3120); shims (fsc 5365); ring spacers (fsc 5365); plate spacers (fsc 5365); lock rings (fsc 5365).