National Aerospace Standard NAS6204-27 Steel Bolt, Shear

\n*Unless otherwise noted, measurements are in inches

\nMaterial\tSteel: Steel (composition E4340 or 8740)
\nSurface Treatment:\tCadmium and chromate
\nThread Class:\t3A
\nThread Direction:\tRight-hand
\nThread Series Designator:\tUNJF
\nThread Length Range:\t.345 to .395
\nFastener Length Range:\t2.043 to 2.073
\nHead Style:\tDished hexagon
\nHead Height Range:\t.125 to .140
\nWidth Between Flats:\t.429 to .439
\nGrip Diameter Range:\t.2485 to .2495
\nNominal Thread Diameter:\t.250
\nGrip Length Range:\t1.678 to 1.698
\nThread Quantity (per inch):\t28
\nMinimum Tensile Strength (lbs/square inch):\t160000
\nHardness Rating Range (Rockwell):\t36 to 40