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About Hex Nuts
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Choose a hex nut with the right profile, material, and strength for your application.
Structural Heavy-Profile Hex Nuts
High-Strength Steel
 |
Thread Size | Wd. | Ht. | Fastener Strength Grade/Class | Specs. Met | Certificate Type | Pkg. Qty. | Pkg. | |||
|---|---|---|---|---|---|---|---|---|---|---|
Black-Oxide Steel | ||||||||||
| 1/2"-13 | 7/8" | 31/64" | ASTM Grade C | ASTM A563 | Material Certificate | 10 | 90580A109 | 00000 | ||
| 5/8"-11 | 1 1/16" | 39/64" | ASTM Grade C | ASTM A563 | Material Certificate | 10 | 90580A204 | 00000 | ||
| 3/4"-10 | 1 1/4" | 47/64" | ASTM Grade C | ASTM A563 | Material Certificate | 5 | 90580A312 | 0000 | ||
| 7/8"-9 | 1 7/16" | 55/64" | ASTM Grade C | ASTM A563 | Material Certificate | 1 | 90580A366 | 0000 | ||
| 1"-8 | 1 5/8" | 63/64" | ASTM Grade C | ASTM A563 | Material Certificate | 1 | 90580A383 | 0000 | ||
| 1 1/8"-7 | 1 3/4" | 1 7/64" | ASTM Grade C | ASTM A563 | — | 1 | 90580A400 | 0000 | ||
| 1 1/4"-7 | 2" | 1 7/32" | ASTM Grade C | ASTM A563 | Material Certificate | 1 | 90580A697 | 0000 | ||
| 1 1/2"-6 | 2 3/8" | 1 15/32" | ASTM Grade C | ASTM A563 | Material Certificate | 1 | 90580A717 | 00000 | ||
Hot-Dipped Galvanized Steel | ||||||||||
| 1/2"-13 | 7/8" | 31/64" | ASTM Grade C | ASTM A563 | Material Certificate | 5 | 90580A737 | 0000 | ||
| 5/8"-11 | 1 1/16" | 39/64" | ASTM Grade C | ASTM A563 | Material Certificate | 1 | 90580A788 | 0000 | ||
| 3/4"-10 | 1 1/4" | 47/64" | ASTM Grade C | ASTM A563 | — | 1 | 90580A792 | 0000 | ||
| 7/8"-9 | 1 7/16" | 55/64" | ASTM Grade C | ASTM A563 | Material Certificate | 1 | 90580A815 | 00000 | ||
| 1"-8 | 1 5/8" | 63/64" | ASTM Grade C | ASTM A563 | Material Certificate | 1 | 90580A822 | 00000 | ||
| 1 1/8"-7 | 1 3/4" | 1 7/64" | ASTM Grade C | ASTM A563 | Material Certificate | 1 | 90580A823 | 00000 | ||
| 1 1/4"-7 | 2" | 1 7/32" | ASTM Grade C | ASTM A563 | Material Certificate | 1 | 90580A827 | 00000 | ||
Steel | ||||||||||
| 1/2"-13 | 7/8" | 31/64" | ASTM Grade C | ASTM A563 | Material Certificate | 25 | 90580A315 | 00000 | ||
| 5/8"-11 | 1 1/16" | 39/64" | ASTM Grade C | ASTM A563 | — | 10 | 90580A320 | 0000 | ||
| 3/4"-10 | 1 1/4" | 47/64" | ASTM Grade C | ASTM A563 | Material Certificate | 10 | 90580A325 | 0000 | ||
| 7/8"-9 | 1 7/16" | 55/64" | ASTM Grade C | ASTM A563 | Material Certificate | 10 | 90580A330 | 00000 | ||
| 1"-8 | 1 5/8" | 63/64" | ASTM Grade C | ASTM A563 | Material Certificate | 5 | 90580A335 | 00000 | ||
| 1 1/8"-7 | 1 3/4" | 1 7/64" | ASTM Grade C | ASTM A563 | — | 1 | 90580A844 | 0000 | ||
| 1 1/4"-7 | 2" | 1 7/32" | ASTM Grade C | ASTM A563 | — | 1 | 90580A345 | 0000 | ||
| 1 1/2"-6 | 2 3/8" | 1 15/32" | ASTM Grade C | ASTM A563 | — | 1 | 90580A957 | 00000 | ||
Extreme-Strength Steel
|
Thread Size | Wd. | Ht. | Fastener Strength Grade/Class | Specs. Met | Certificate Type | Pkg. Qty. | Pkg. | |||
|---|---|---|---|---|---|---|---|---|---|---|
Black-Oxide Steel | ||||||||||
| 1/2"-13 | 0.863" | 0.484" | ASTM Grade DH | ASTM A563 | — | 10 | 90763A110 | 000000 | ||
| 5/8"-11 | 1.047" | 0.609" | ASTM Grade DH | ASTM A563 | — | 5 | 90763A120 | 00000 | ||
| 3/4"-10 | 1.231" | 0.734" | ASTM Grade DH | ASTM A563 | — | 5 | 90763A130 | 00000 | ||
| 7/8"-9 | 1.416" | 0.859" | ASTM Grade DH | ASTM A563 | — | 1 | 90763A140 | 0000 | ||
| 1"-8 | 1.6" | 0.984" | ASTM Grade DH | ASTM A563 | Material Certificate | 1 | 90763A150 | 00000 | ||
| 1 1/4"-7 | 1.969" | 1.219" | ASTM Grade DH | ASTM A563 | — | 1 | 90763A170 | 00000 | ||
Hot-Dipped Galvanized Steel | ||||||||||
| 1/2"-13 | 7/8" | 31/64" | ASTM Grade DH | ASTM A563 | — | 25 | 91694A315 | 00000 | ||
| 5/8"-11 | 1 1/16" | 39/64" | ASTM Grade DH | ASTM A563 | Material Certificate | 10 | 91694A320 | 00000 | ||
| 3/4"-10 | 1 1/4" | 47/64" | ASTM Grade DH | ASTM A563 | — | 10 | 91694A325 | 00000 | ||
| 7/8"-9 | 1 7/16" | 55/64" | ASTM Grade DH | ASTM A563 | Material Certificate | 10 | 91694A330 | 00000 | ||
| 1"-8 | 1 5/8" | 63/64" | ASTM Grade DH | ASTM A563 | Material Certificate | 5 | 91694A335 | 00000 | ||
| 1 1/8"-7 | 1 13/16" | 1 7/64" | ASTM Grade DH | ASTM A563 | Material Certificate | 1 | 91694A337 | 0000 | ||
| 1 1/4"-7 | 2" | 1 7/32" | ASTM Grade DH | ASTM A563 | Material Certificate | 1 | 91694A340 | 0000 | ||
| 1 1/2"-6 | 2 3/8" | 1 15/32" | ASTM Grade DH | ASTM A563 | Material Certificate | 1 | 91694A345 | 00000 | ||
Steel | ||||||||||
| 1/2"-13 | 7/8" | 31/64" | ASTM Grade DH | ASTM A563 | Material Certificate | 25 | 98427A150 | 00000 | ||
| 5/8"-11 | 1 1/16" | 39/64" | ASTM Grade DH | ASTM A563 | — | 10 | 98427A200 | 00000 | ||
| 3/4"-10 | 1 1/4" | 47/64" | ASTM Grade DH | ASTM A563 | — | 10 | 98427A250 | 00000 | ||
| 7/8"-9 | 1 7/16" | 55/64" | ASTM Grade DH | ASTM A563 | — | 5 | 98427A300 | 00000 | ||
| 1"-8 | 1 5/8" | 63/64" | ASTM Grade DH | ASTM A563 | Material Certificate | 1 | 98427A350 | 0000 | ||
| 1 1/8"-7 | 1 13/16" | 1 7/64" | ASTM Grade DH | ASTM A563 | — | 1 | 98427A400 | 0000 | ||
| 1 1/4"-7 | 2" | 1 7/32" | ASTM Grade DH | ASTM A563 | Material Certificate | 1 | 98427A450 | 0000 | ||
| 1 1/2"-6 | 2 3/8" | 1 15/32" | ASTM Grade DH | ASTM A563 | — | 1 | 98427A600 | 00000 | ||
Zinc-Flake-Coated Steel | ||||||||||
| 1/2"-13 | 7/8" | 31/64" | ASTM Grade DH | ASTM A563 | Material Certificate | 25 | 91807A121 | 00000 | ||
| 5/8"-11 | 1 1/16" | 39/64" | ASTM Grade DH | ASTM A563 | Material Certificate | 10 | 91807A122 | 00000 | ||
| 3/4"-10 | 1 1/4" | 47/64" | ASTM Grade DH | ASTM A563 | Material Certificate | 10 | 91807A123 | 00000 | ||
Steel Hex Head Screw Kits for Metal Pipe Flanges
 |  |
Shown Installed |
Join steel or cast iron pipe flanges. These kits come with screws and nuts in the right size and number to match your flange's bolt holes. The screws have a head with six flat sides to keep wrenches and sockets from slipping and rounding off the drive.
Screw length is measured from under the head. For a tight seal, you’ll also need a gasket between the flanges.
Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
Hot-Dipped Galvanized Steel—The strength of steel with the rust resistance of stainless steel. These screws are an economical alternative to 18-8 stainless steel in wet and outdoor environments, but they won't hold up to salt water and chemicals. The galvanized finish is thicker than other types of coatings, so the threads may be more likely to stick during installation. You can only mate these screws with hot-dipped galvanized nuts.
Screw | Nut | Zinc-Plated Steel Screws and Nuts | Hot-Dipped Galvanized Steel Screws and Nuts | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Pipe Size | Thread Size | Lg. | Head Wd. | Head Ht. | Threading | Thread Spacing | Tensile Strength, psi | Wd. | Ht. | Includes | Each | Each | ||||
For Class 125/150 Flanges | ||||||||||||||||
| 1/2, 3/4 | 1/2"-13 | 2" | 3/4" | 11/32" | Partially Threaded | Coarse | 60,000 | 3/4" | 7/16" | 4 Hex Head Screws 4 Hex Nuts | 97788A116 | 00000 | 97788A125 | 00000 | ||
| 1, 1 1/4 | 1/2"-13 | 2 1/4" | 3/4" | 11/32" | Partially Threaded | Coarse | 60,000 | 3/4" | 7/16" | 4 Hex Head Screws 4 Hex Nuts | 97788A117 | 0000 | 97788A127 | 0000 | ||
| 1 1/2 | 1/2"-13 | 2 1/2" | 3/4" | 11/32" | Partially Threaded | Coarse | 60,000 | 3/4" | 7/16" | 4 Hex Head Screws 4 Hex Nuts | 97788A118 | 0000 | 97788A128 | 0000 | ||
| 2 | 5/8"-11 | 2 3/4" | 15/16" | 27/64" | Partially Threaded | Coarse | 60,000 | 15/16" | 35/64" | 4 Hex Head Screws 4 Hex Nuts | 97788A119 | 0000 | 97788A134 | 0000 | ||
| 2 1/2, 3 | 5/8"-11 | 3" | 15/16" | 27/64" | Partially Threaded | Coarse | 60,000 | 15/16" | 35/64" | 4 Hex Head Screws 4 Hex Nuts | 97788A124 | 0000 | 97788A135 | 0000 | ||
| 3 1/2, 4 | 5/8"-11 | 3" | 15/16" | 27/64" | Partially Threaded | Coarse | 60,000 | 15/16" | 35/64" | 8 Hex Head Screws 8 Hex Nuts | 97788A132 | 0000 | 97788A144 | 00000 | ||
| 5, 6 | 3/4"-10 | 3 1/4" | 1 1/8" | 1/2" | Partially Threaded | Coarse | 60,000 | 1 1/8" | 41/64" | 8 Hex Head Screws 8 Hex Nuts | 97788A136 | 00000 | 97788A151 | 00000 | ||
| 10, 12 | 7/8"-9 | 4" | 1 5/16" | 37/64" | Partially Threaded | Coarse | 60,000 | 1 5/16" | 3/4" | 12 Hex Head Screws 12 Hex Nuts | 97788A147 | 00000 | 97788A154 | 00000 | ||
For Class 250/300 Flanges | ||||||||||||||||
| 1/2 | 1/2"-13 | 2 1/4" | 3/4" | 11/32" | Partially Threaded | Coarse | 60,000 | 3/4" | 7/16" | 4 Hex Head Screws 4 Hex Nuts | 97788A158 | 0000 | 97788A123 | 0000 | ||
| 3/4, 1 | 5/8"-11 | 2 1/2" | 15/16" | 27/64" | Partially Threaded | Coarse | 60,000 | 15/16" | 35/64" | 4 Hex Head Screws 4 Hex Nuts | 97788A121 | 0000 | 97788A129 | 0000 | ||
| 1 1/4 | 5/8"-11 | 2 3/4" | 15/16" | 27/64" | Partially Threaded | Coarse | 60,000 | 15/16" | 35/64" | 4 Hex Head Screws 4 Hex Nuts | 97788A122 | 0000 | 97788A131 | 0000 | ||
| 1 1/2 | 3/4"-10 | 3" | 1 1/8" | 1/2" | Partially Threaded | Coarse | 60,000 | 1 1/8" | 41/64" | 4 Hex Head Screws 4 Hex Nuts | 97788A126 | 0000 | 97788A139 | 0000 | ||
| 2 | 5/8"-11 | 3" | 15/16" | 27/64" | Partially Threaded | Coarse | 60,000 | 15/16" | 35/64" | 8 Hex Head Screws 8 Hex Nuts | 97788A133 | 0000 | 97788A142 | 00000 | ||
| 2 1/2 | 3/4"-10 | 3 1/4" | 1 1/8" | 1/2" | Partially Threaded | Coarse | 60,000 | 1 1/8" | 41/64" | 8 Hex Head Screws 8 Hex Nuts | 97788A137 | 00000 | 97788A148 | 00000 | ||
| 3 | 3/4"-10 | 3 1/2" | 1 1/8" | 1/2" | Partially Threaded | Coarse | 60,000 | 1 1/8" | 41/64" | 8 Hex Head Screws 8 Hex Nuts | 97788A138 | 00000 | 97788A146 | 00000 | ||
| 3 1/2, 4 | 3/4"-10 | 3 3/4" | 1 1/8" | 1/2" | Partially Threaded | Coarse | 60,000 | 1 1/8" | 41/64" | 8 Hex Head Screws 8 Hex Nuts | 97788A141 | 00000 | 97788A149 | 00000 | ||
| 5 | 3/4"-10 | 4 1/4" | 1 1/8" | 1/2" | Partially Threaded | Coarse | 60,000 | 1 1/8" | 41/64" | 8 Hex Head Screws 8 Hex Nuts | 97788A143 | 00000 | ——— | 0 | ||
| 6 | 3/4"-10 | 4 1/4" | 1 1/8" | 1/2" | Partially Threaded | Coarse | 60,000 | 1 1/8" | 41/64" | 12 Hex Head Screws 12 Hex Nuts | 97788A145 | 00000 | 97788A153 | 00000 | ||
| 8 | 7/8"-9 | 4 3/4" | 1 5/16" | 37/64" | Partially Threaded | Coarse | 60,000 | 1 5/16" | 3/4" | 12 Hex Head Screws 12 Hex Nuts | 97788A152 | 00000 | 97788A157 | 000000 | ||
| 10 | 1"-8 | 5 1/2" | 1 1/2" | 43/64" | Partially Threaded | Coarse | 60,000 | 1 1/2" | 55/64" | 16 Hex Head Screws 16 Hex Nuts | 97788A155 | 00000 | ——— | 0 | ||
| 12 | 1 1/8"-7 | 5 3/4" | 1 11/16" | 3/4" | Partially Threaded | Coarse | 60,000 | 1 11/16" | 31/32" | 16 Hex Head Screws 16 Hex Nuts | 97788A156 | 000000 | ——— | 0 | ||
Steel Hex Head Screw Kits for Plastic Pipe Flanges
 |  |
Shown Installed |
All the hardware you need to join plastic pipe flanges. These kits come with screws, nuts, and washers in the right size and number to match your flange's bolt holes. The screws have a head with six flat sides to keep wrenches and sockets from slipping and rounding off the drive.
Screw length is measured from under the head. For a tight seal, you’ll also need a gasket between the flanges.
Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
Screw | Nut | Washer | Zinc-Plated Steel Screws and Nuts | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Pipe Size | Thread Size | Lg. | Head Wd. | Head Ht. | Threading | Thread Spacing | Tensile Strength, psi | Wd. | Ht. | ID | OD | Thk. | Includes | Each | |||
For Class 150 Flanges | |||||||||||||||||
| 1/2 | 1/2"-13 | 2" | 3/4" | 5/16" | Partially Threaded | Coarse | 60,000 | 3/4" | 7/16" | 0.562" | 1.375" | 0.109" | 4 Hex Head Screws 4 Hex Nuts 8 Flat Washers | 97751A110 | 00000 | ||
| 3/4, 1 | 1/2"-13 | 2 1/4" | 3/4" | 5/16" | Partially Threaded | Coarse | 60,000 | 3/4" | 7/16" | 0.562" | 1.375" | 0.109" | 4 Hex Head Screws 4 Hex Nuts 8 Flat Washers | 97751A120 | 0000 | ||
| 1 1/4, 1 1/2 | 1/2"-13 | 2 1/2" | 3/4" | 5/16" | Partially Threaded | Coarse | 60,000 | 3/4" | 7/16" | 0.562" | 1.375" | 0.109" | 4 Hex Head Screws 4 Hex Nuts 8 Flat Washers | 97751A130 | 0000 | ||
| 2 | 5/8"-11 | 3" | 15/16" | 25/64" | Partially Threaded | Coarse | 60,000 | 15/16" | 35/64" | 0.688" | 1.750" | 0.141" | 4 Hex Head Screws 4 Hex Nuts 8 Flat Washers | 97751A140 | 00000 | ||
| 2 1/2 | 5/8"-11 | 3 1/4" | 15/16" | 25/64" | Partially Threaded | Coarse | 60,000 | 15/16" | 35/64" | 0.688" | 1.750" | 0.141" | 4 Hex Head Screws 4 Hex Nuts 8 Flat Washers | 97751A150 | 00000 | ||
| 3 | 5/8"-11 | 3 1/2" | 15/16" | 25/64" | Partially Threaded | Coarse | 60,000 | 15/16" | 35/64" | 0.688" | 1.750" | 0.141" | 4 Hex Head Screws 4 Hex Nuts 8 Flat Washers | 97751A160 | 00000 | ||
| 4 | 5/8"-11 | 3 1/2" | 15/16" | 25/64" | Partially Threaded | Coarse | 60,000 | 15/16" | 35/64" | 0.688" | 1.750" | 0.141" | 8 Hex Head Screws 8 Hex Nuts 16 Flat Washers | 97751A170 | 00000 | ||
| 5, 6 | 3/4"-10 | 4" | 1 1/8" | 15/32" | Partially Threaded | Coarse | 60,000 | 1 1/8" | 21/32" | 0.812" | 2.000" | 0.156" | 8 Hex Head Screws 8 Hex Nuts 16 Flat Washers | 97751A180 | 00000 | ||
| 8 | 3/4"-10 | 4 1/2" | 1 1/8" | 15/32" | Partially Threaded | Coarse | 60,000 | 1 1/8" | 21/32" | 0.812" | 2.000" | 0.156" | 8 Hex Head Screws 8 Hex Nuts 16 Flat Washers | 97751A190 | 00000 | ||
| 10, 12 | 7/8"-9 | 6" | 1 5/16" | 35/64" | Partially Threaded | Coarse | 60,000 | 1 5/16" | 49/64" | 0.938" | 2.250" | 0.172" | 12 Hex Head Screws 12 Hex Nuts 24 Flat Washers | 97751A210 | 000000 | ||
Steel Heavy Hex Head Screw Kits for Metal Pipe Flanges
 |  |
Shown Installed |
All the hardware you need to join steel or cast iron pipe flanges. These kits come with screws and nuts in the right size and number to match your flange's bolt holes. With screw heads and nuts that are about 10% wider than standard, these kits handle heavier loads by distributing them over a larger area. The head also gives you six, flat contact points, so wrenches and sockets won't slip and round off the drive.
Screw length is measured from under the head. For a tight seal, you’ll also need a gasket between the flanges.
Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
Hot-Dipped Galvanized Steel—The strength of steel with the rust resistance of stainless steel. These screws are an economical alternative to 18-8 stainless steel in wet and outdoor environments, but they won't hold up to salt water and chemicals. The galvanized finish is thicker than other types of coatings, so the threads may be more likely to stick during installation. You can only mate these screws with hot-dipped galvanized nuts.
Screw | Nut | Zinc-Plated Steel Screws and Nuts | Hot-Dipped Galvanized Steel Screws and Nuts | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Pipe Size | Thread Size | Lg. | Head Wd. | Head Ht. | Threading | Thread Spacing | Tensile Strength, psi | Wd. | Ht. | Includes | Each | Each | ||||
For Class 125/150 Flanges | ||||||||||||||||
| 2 | 5/8"-11 | 2 3/4" | 1 1/16" | 27/64" | Partially Threaded | Coarse | 60,000 | 1 1/16" | 39/64" | 4 Heavy Hex Head Screws 4 Heavy Hex Nuts | 97771A112 | 00000 | 97771A113 | 000000 | ||
| 2 1/2, 3 | 5/8"-11 | 3" | 1 1/16" | 27/64" | Partially Threaded | Coarse | 60,000 | 1 1/16" | 39/64" | 4 Heavy Hex Head Screws 4 Heavy Hex Nuts | 97771A111 | 0000 | 97771A114 | 00000 | ||
| 3 1/2, 4 | 5/8"-11 | 3" | 1 1/16" | 27/64" | Partially Threaded | Coarse | 60,000 | 1 1/16" | 39/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97771A115 | 00000 | 97771A119 | 00000 | ||
| 5, 6 | 3/4"-10 | 3 1/4" | 1 1/4" | 1/2" | Partially Threaded | Coarse | 60,000 | 1 1/4" | 47/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97771A117 | 00000 | 97771A123 | 00000 | ||
For Class 250/300 Flanges | ||||||||||||||||
| 2 | 5/8"-11 | 3" | 1 1/16" | 27/64" | Partially Threaded | Coarse | 60,000 | 1 1/16" | 39/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97771A116 | 00000 | 97771A122 | 00000 | ||
| 3 | 3/4"-10 | 3 1/2" | 1 1/4" | 1/2" | Partially Threaded | Coarse | 60,000 | 1 1/4" | 47/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97771A118 | 00000 | 97771A124 | 00000 | ||
| 4 | 3/4"-10 | 3 3/4" | 1 1/4" | 1/2" | Partially Threaded | Coarse | 60,000 | 1 1/4" | 47/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97771A121 | 00000 | 97771A126 | 00000 | ||
| 6 | 3/4"-10 | 4 1/4" | 1 1/4" | 1/2" | Partially Threaded | Coarse | 60,000 | 1 1/4" | 47/64" | 12 Heavy Hex Head Screws 12 Heavy Hex Nuts | 97771A125 | 00000 | 97771A127 | 000000 | ||
