1/4" - 20  x  7/8" U.N.R.C. Coarse Thread
Product Code Number 44096

Nominal Size or Basic Screw Diameter Head Diameter Head Height Head Chamfer Hex Socket Size Key Engagement Wall Thickness Edge of Head Chamfer Length
Max Min Max Min Max Nom Min Min Max Under Head
1/4" (0.2500) 0.375 0.365 0.250 0.244 0.025 3/16 (0.188) 0.120 0.095 0.010 7/8
SEE NOTES 1 3    4 20      6 9, 10, 11

NOTES: (9) Length (18) Surface Roughness
(1) Nominal Size (10) Standard Lengths (19) Drawings
(2) Body (11) Length Tolerances (20) Hexagon Socket Dimensions
(3) Head Diameter (12) Threads (21) Dimensional Conformance
(4) Head Chamfer (13) Thread Length (22) Designation
(5) Bearing Surfaces  (14) Grip Gaging Length  (23) Gaging of Hexagon Sockets
(6) Edge of Head (15) Body Length (24) Screw Thread Limits
(7) Concentricity  (16) Screw Point Chamfer  (25) Mechanical Properties
(8) Fillet (17) Material

Reprinted from ASME/ANSI B18.3 by permission of The American Society of Mechanical Engineers.  All rights reserved.  For a full copy of the standards, contact the ASME at http://www.asme.org/codes/.

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