1/4" - 20  x  3/4" U.N.R.C. Coarse Thread
Stainless Steel - Not Heat Treated
Product Code Number 26064


Nominal Size or Basic Screw Diameter Body Diameter Head Diameter Head Height Head Side Height Hex Socket Size Key Engagement Wall Thickness Chamfer or Radius Length
Max Min Max Min Max Min Min Nom Min Min Max Under Head
1/4" (0.2500) 0.2500 0.2435 0.375 0.365 0.250 0.244 0.225 3/16 (0.188) 0.120 0.095 0.008 3/4
SEE NOTES 1  2, 11, 16 3, 16   4 Table 2, 16        15

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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