1/4 - 20  x  3/8" U.N.R.C. Coarse Thread
Product Code Number 18020
Nominal Size or Basic Screw Diameter Head
Diameter 		Head Height J-Hex Socket Size Key Engagement Fillet Transition Diameter Length, Overall
Max Min Max Min Nom Min Max Min
1/4 (0.2500) 0.375 0.369 0.125 0.121 0.1250 0.094 0.278 0.262 3/8
SEE NOTES 1 2            6 8, 9

NOTES:
(1) Nominal Size (6) Fillet (11) Threads 
(2) Head Diameter (7) Thread Length (12) Material
(3) Head Chamfer (8) Length (13) Hexagon Socket Dimensions
(4) Bearing Surfaces  (9) Length Tolerances  (14) Gaging of Hexagon Sockets
(5) Edge of Head (10) Screw Point Chamfer  (15) Screw Thread Limits

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