One Piece Cap (Acorn) Closed-End Hex Cap Nuts, Low Crown: Dimensions & Specifications

One Piece Cap (Acorn) Closed-End Hex Cap Nuts, Low Crown Drawing 

One Piece Cap (Acorn) Closed-End Hex Cap Nuts, Low Crown

Nominal Size or Basic
Major Diameter of
Thread

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Width Across Flats
(F)

Width Across Corners
(G)

 Body Diameter
A)
 Overall
Height
(H)
 Hexagon
Height
(Q)
 Drill Depth
(T)		 Full
Thread
(U)
Max Min Max Min Max Min
6 0.1380 0.3125 0.302  0.361  0.344 0.30 0.34  0.16 0.25 0.16
8 0.1640 0.3125 0.302   0.361   0.344 0.30 0.34  0.16 0.25 0.16
10 0.1900 0.3750 0.362  0.433  0.413 0.36 0.41  0.19 0.28 0.19
1/4 0.2500 0.4375 0.428   0.505   0.488 0.41 0.47  0.22 0.34 0.25
5/16 0.3125 0.5000 0.489  0.577  0.557 0.47 0.53  0.25 0.41 0.31
3/8 0.3750 0.5625 0.551  0.650 0.628  0.53 0.62  0.28 0.45 0.38
1/2 0.5000 0.7500 0.736  0.866 0.840 0.72 0.81  0.38 0.59 0.50
5/8 0.6250 0.9375 0.922 1.083 1.051 0.91 1.00  0.47 0.75 0.62
3/4 0.7500 1.0625 1.045 1.227 1.191 1.03 1.16  0.53 0.88 0.75

 

Two Piece Closed-End Hex Cap Nuts

Nominal Size or Basic
Major Diameter of
Thread

 

Width Across Flats
(F)

Width Across Corners
(G)

 Overall Height
(H)
Max Min Max Min Max Min
4 0.1120 0.248 0.225  -  - 0.200 0.177
5 0.1250 0.3125 0.302   0.361   0.344 0.260 0.240
6 0.1380 0.3125 0.302  0.361  0.344 0.260 0.240
8 0.1640 0.3125 0.302   0.361   0.344 0.260 0.240
10 0.1900 0.3750 0.362  0.433  0.413 0.291 0.271
1/4 0.2500 0.4375 0.423  0.505 0.482  0.338 0.318
5/16 0.3125 0.562 0.545  0.650 0.621 0.385 0.365
3/8 0.3750 0.625 0.607 0.722 0.692 0.432 0.412
7/16 0.4375 0.673 0.659 0.775 0.750 0.680 0.660
1/2 0.5000 0.750 0.736 0.866 0.840 0.572 0.552
9/16 0.5625 0.875 0.861 1.010 0.982 0.482 0.462
5/8 0.6250 0.938 0.909 1.083 1.037 0.807 0.787
3/4 0.7500 1.12 1.08 - - 1.12 1.08
7/8 0.8750 1.250 1.212 1.443 1.382 1.420 1.380
1 1.0000 1.497 1.447 1.728 1.650 1.572 1.414

 
NOTE: There's no single standard dimensions for a cap nut size. These values are offered as a guide; there may be deviations from these specifications.

Description

Steel: Usually the low-crown cap nut is made of two parts, a hex nut and an acorn-shaped top, zinc die cast to form the completed part. Stainless: Made from an austenitic
stainless alloy, similar in design to the steel nut. Nuts can be the style of one or two pieces.
Applications/
Advantages

Cap nuts serve two primary purposes: (1) as ornamental parts, and (2) as thread covers.

Material

Steel: Nuts are produced of low-carbon steel that meets the following criteria for chemical composition - 

Carbon: 0.47% max.; Phosphorus: 0.12% max.; Sulfur: 0.23% max..

Stainless: 304L or equivalent stainless.
Plating For more info., see table above.