| Hex Nut Dimensions (ANSI/ASME B18.2.2) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Nominal or Basic Major Diameter of Thread Click on the size to shop products |
Width Across Flats (F) |
Width Across Corners (G) | Thickness of Hex Nuts (H) | ||||||
| Basic | Max | Min | Max | Min | Basic | Max | Min | ||
| 1/4 | 0.2500 | 7/16 | .438 | .428 | .505 | .488 | 7/32 | 0.226 | 0.212 |
| 5/16 | 0.3125 | 1/2 | .500 | .489 | .577 | .557 | 17/64 | 0.273 | 0.258 |
| 3/8 | 0.3750 | 9/16 | .562 | .551 | .650 | .628 | 21/64 | 0.337 | 0.320 |
| 7/16 | 0.4375 | 11/16 | .688 | .675 | .794 | .768 | 3/8 | 0.385 | 0.365 |
| 1/2 | 0.5000 | 3/4 | .750 | .736 | .866 | .840 | 7/16 | 0.448 | 0.427 |
| 9/16 | 0.5625 | 7/8 | .875 | .861 | 1.010 | .982 | 31/64 | 0.496 | 0.473 |
| 5/8 | 0.6250 | 15/16 | .938 | .922 | 1.083 | 1.051 | 35/64 | 0.559 | 0.535 |
| 3/4 | 0.7500 | 1-1/8 | 1.125 | 1.088 | 1.299 | 1.240 | 41/64 | 0.665 | 0.617 |
| 7/8 | 0.8750 | 1-5/16 | 1.312 | 1.269 | 1.516 | 1.447 | 3/4 | 0.776 | 0.724 |
| 1 | 1.0000 | 1-1/2 | 1.500 | 1.450 | 1.732 | 1.653 | 55/64 | 0.887 | 0.831 |
| 1-1/8 | 1.1250 | 1-11/16 | 1.688 | 1.631 | 1.949 | 1.859 | 31/32 | 0.999 | 0.939 |
| 1-1/4 | 1.2500 | 1-7/8 | 1.875 | 1.812 | 2.165 | 2.066 | 1-1/16 | 1.094 | 1.030 |
| 1-3/8 | 1.3750 | 2-1/16 | 2.062 | 1.994 | 2.382 | 2.273 | 1-11/64 | 1.206 | 1.138 |
| 1-1/2 | 1.5000 | 2-1/4 | 2.250 | 2.175 | 2.598 | 2.480 | 1-9/32 | 1.317 | 1.245 |
| 1-5/8 | 1.6250 | 2-7/16 | 2.438 | 2.356 | 2.815 | 2.686 | 1-25/64 | 1.429 | 1.353 |
| 1-3/4 | 1.7500 | 2-5/8 | 2.625 | 2.538 | 3.031 | 2.893 | 1-1/2 | 1.540 | 1.460 |
| 2 | 2.000 | 3 | 3.000 | 2.900 | 3.464 | 3.306 | 1-23/32 | 1.763 | 1.675 |
| 2-1/4 | 2.2500 | 3-3/8 | 3.375 | 3.263 | 3.897 | 3.719 | 1-15/16 | 1.986 | 1.890 |
| 2-1/2 | 2.5000 | 3-3/4 | 3.750 | 3.625 | 4.330 | 4.133 | 2-5/32 | 2.209 | 2.105 |
| 2-3/4 | 2.7500 | 4-1/8 | 4.125 | 3.988 | 4.763 | 4.456 | 2-3/8 | 2.431 | 2.319 |
| 3 | 3.000 | 4-1/2 | 4.500 | 4.350 | 5.196 | 4.959 | 2-19/32 | 2.654 | 2.534 |
* Click on the nominal size to find products.
| Grade 2 Hex Nuts | ||
|---|---|---|
|
Grade 2 Hex Nut Marking
|
||
| Description | A six-sided internally threaded fastener whose thickness is .875 where D is the nominal nut size and 1.5D is their width across the flats. | |
| Applications | Grade-2 Finished Hex Nuts are the most versatile and commonly used nut design. Grade-2 nuts are for use with any low carbon bolt or screw that is not heat-treated, with a specified minimum tensile strength of 74,000 psi or less. | |
| Material |
Low Carbon Steel - Carbon: 0.47% max, Phosphorus: 0.12% max; Sulfur: 0.23% max | |
| Hardness | Rockwell B68-32 | |
| Proof Load |
Coarse thread; 90,000 psi; Fine thread; 80,000 psi |
|
| Steel Hot Dipped Galvanized Hex Nuts | ||
|---|---|---|
| Description | A six-sided internally threaded fastener whose thickness is .875 where D is the nominal nut size and 1.5D is their width across the flats. Made from low carbon steel with a galvanized zinc coating. | |
| Applications | Commonly used for applications subject to salt, moisture, and other corrosive conditions. The nut is designed for use with low carbon bolts and screws. | |
| Material |
Low Carbon Steel - Carbon: 0.47% max, Phosphorus: 0.12% max; Sulfur: 0.23% max | |
| Hardness | Rockwell B68-32 | |
| Proof Load |
Coarse thread; 68,000 psi; Fine thread; 60,000 psi |
|
| Stainless Steel, 18-8 & 316 Hex Nuts | ||
|---|---|---|
| Description | A six-sided internally threaded fastener whose thickness is .875 where D is the nominal nut size and 1.5D is their width across the flats. Made from austenitic alloys. | |
| Applications | Designed for use with stainless steel bolts and screws with a specified minimum tensile strength equal to or less than the specified proof stress of the mating nut. Both types of stainless steel are corrosion-resistant with 316 stainless steel hex nuts having greater resistance as well as a higher strength at higher temperatures. | |
| Material |
18-8 Finished Hex Nuts are made from one of the following alloys: 303, 303s, 304, XM7, which are all have a chromium content of 18% and a nickel content of 8-10%. 316 Finished Hex Nuts are made from 316 stainless steel , an austenitic alloy which differs from 18-8 by its molybdenum content (2-3%) and a higher nickel content (10-14%). |
|
| Hardness | 1/4" - 5/8": Rockwell B95-C32, 3/4"-1": Rockwell B80-C32 | |
| Proof Load |
Coarse thread; 100,000 psi; Fine thread; 85,000 psi |
|
| Grade 5 Hex Nuts | ||
|---|---|---|
|
Grade 5 Hex Nut Marking
|
||
| Description | A finished hex nut made from steel with a max carbon content of 0.55%, a min manganese content of 0.30%, and a maximum sulfur content of 0.15%. | |
| Applications | Designed for use with bolts with a min tensile strength equal to or less than the specified proof stress of the nut. | |
| Material |
AISI 1008-1026 or equivalent |
|
| Core Hardness | Rockwell C32 max | |
| Proof Load |
1/4" - 1" Coarse Thread: 120,000 psi; Fine Thread: 109,000 psi 1-1/8" - 1-1/2" Coarse Thread: 105,000 psi; Fine Thread: 94,000 psi |
|
| Grade 8 Hex Nuts | ||
|---|---|---|
|
Grade 8 Hex Nut Marking
|
||
| Description | A finished hex nut made from steel with a max carbon content of 0.55%, a min manganese content of 0.30%, and a maximum sulfur content of 0.05%. | |
| Applications | Designed for use with bolts with a min tensile strength equal to or less than 150,000 psi. | |
| Material |
AISI 1021-1045 or equivalent steel. |
|
| Core Hardness |
1/4" - 5/8": Rockwell C24-C32 3/4" - 1": Rockwell C26-C34 Over 1" - 1-1/2": Rockwell C26-C36 |
|
| Proof Load |
1/4" - 1-1/2" 150,000 psi |
|
Additional Resources
