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Choose a hex head fastener with the right threading, thread size, material, and strength for your equipment.
Medium-Strength Grade 5 Steel Hex Head Screws with Nuts and Washers
Twice as strong as low-strength steel screws, these Grade 5 screws are suitable for fastening most machinery and equipment. They come with matching nuts and washers so you can make a complete joint. All are zinc plated to prevent corrosion in wet environments. Washers distribute the pressure from a tightened nut over the surface of your material, which helps prevent damage. Screws and nuts meet SAE specifications for material quality and ASME specifications for dimensions. For quick identification, the screw heads are marked with three radial lines. Length is measured from under the head.
Screw | Nut | Washer | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Head Wd. | Head Ht. | Tensile Strength, psi | Features | Wd. | Ht. | ID | OD | Thick. | Pkg. Qty. | Pkg. | |
Zinc-Plated Grade 5 Steel | |||||||||||||||
1/4"-20 | |||||||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 120,000 | With Nut and Two Washers | 7/16" | 7/32" | 0.281" | 0.625" | 0.065" | 25 | 97375A124 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 120,000 | With Nut and Two Washers | 7/16" | 7/32" | 0.281" | 0.625" | 0.065" | 25 | 97375A126 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 120,000 | With Nut and Two Washers | 7/16" | 7/32" | 0.281" | 0.625" | 0.065" | 25 | 97375A123 | 00000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 120,000 | With Nut and Two Washers | 7/16" | 7/32" | 0.281" | 0.625" | 0.065" | 25 | 97375A122 | 00000 |
| 1 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 120,000 | With Nut and Two Washers | 7/16" | 7/32" | 0.281" | 0.625" | 0.065" | 25 | 97375A121 | 00000 |
| 2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 120,000 | With Nut and Two Washers | 7/16" | 7/32" | 0.281" | 0.625" | 0.065" | 25 | 97375A125 | 00000 |
5/16"-18 | |||||||||||||||
| 3/4" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 120,000 | With Nut and Two Washers | 1/2" | 17/64" | 0.343" | 0.687" | 0.065" | 25 | 97375A131 | 00000 |
| 1" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 120,000 | With Nut and Two Washers | 1/2" | 17/64" | 0.343" | 0.687" | 0.065" | 25 | 97375A129 | 00000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 120,000 | With Nut and Two Washers | 1/2" | 17/64" | 0.343" | 0.687" | 0.065" | 25 | 97375A128 | 00000 |
| 1 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 120,000 | With Nut and Two Washers | 1/2" | 17/64" | 0.343" | 0.687" | 0.065" | 25 | 97375A127 | 00000 |
3/8"-16 | |||||||||||||||
| 1" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 120,000 | With Nut and Two Washers | 9/16" | 21/64" | 0.406" | 0.812" | 0.065" | 10 | 97375A135 | 00000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 120,000 | With Nut and Two Washers | 9/16" | 21/64" | 0.406" | 0.812" | 0.065" | 25 | 97375A133 | 00000 |
| 1 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 120,000 | With Nut and Two Washers | 9/16" | 21/64" | 0.406" | 0.812" | 0.065" | 25 | 97375A132 | 00000 |
| 1 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 120,000 | With Nut and Two Washers | 9/16" | 21/64" | 0.406" | 0.812" | 0.065" | 25 | 97375A134 | 00000 |
| 2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 120,000 | With Nut and Two Washers | 9/16" | 21/64" | 0.406" | 0.812" | 0.065" | 10 | 97375A137 | 0000 |
| 2 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 120,000 | With Nut and Two Washers | 9/16" | 21/64" | 0.406" | 0.812" | 0.065" | 10 | 97375A136 | 00000 |
| 3" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 120,000 | With Nut and Two Washers | 9/16" | 21/64" | 0.406" | 0.812" | 0.065" | 10 | 97375A138 | 00000 |
1/2"-13 | |||||||||||||||
| 1" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 120,000 | With Nut and Two Washers | 3/4" | 7/16" | 0.531" | 1.062" | 0.095" | 10 | 97375A141 | 00000 |
| 1 1/2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 120,000 | With Nut and Two Washers | 3/4" | 7/16" | 0.531" | 1.062" | 0.095" | 10 | 97375A139 | 00000 |
| 2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 120,000 | With Nut and Two Washers | 3/4" | 7/16" | 0.531" | 1.062" | 0.095" | 10 | 97375A143 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 120,000 | With Nut and Two Washers | 3/4" | 7/16" | 0.531" | 1.062" | 0.095" | 10 | 97375A142 | 00000 |
| 3" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 120,000 | With Nut and Two Washers | 3/4" | 7/16" | 0.531" | 1.062" | 0.095" | 5 | 97375A144 | 00000 |
Hex Head Screw, Nut, and Washer Assortments
Keep the most common sizes of hex head screws, nuts, and washers on hand. The length of the screws is measured from under the head.
Assortments with multiple thread sizes help you replace damaged fasteners when you don’t have a thread checker handy—just test out sizes until you find what you need. Those that come in a cabinet have two removable drawers. Assortments with one thread size include screws in a variety of lengths.
Grade 5 and Class 8.8 steel fasteners are suitable for use on most machinery and equipment. Grade 8 and Class 10.9 steel fasteners can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than Grade 5 and Class 8.8 steel fasteners.
Zinc-plated steel and zinc yellow-chromate plated steel fasteners resist corrosion in wet environments. They’re a good choice for most applications.
Match the thread spacing of mating components. Coarse threads are the industry standard; choose these fasteners if you don’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration.
| Number of Pieces | Includes | Thread Spacing | Container Type | Each | |
Inch | |||||
|---|---|---|---|---|---|
Zinc-Plated Grade 5 Steel | |||||
| 910 | 285 Hex Head Screws (1/4"-20 to 3/8"-16 in 1/2" to 2" Lengths) 125 Hex Nuts (1/4"-20 to 3/8"-16) 250 Flat Washers (For 1/4" to 3/8" Screw Sizes) 250 Split Lock Washers (For 1/4" to 3/8" Screw Sizes) | Coarse | Metal Box | 91340A112 | 0000000 |
| 910 | 285 Hex Head Screws (1/4"-28 to 3/8"-24 in 1/2" to 2" Lengths) 125 Hex Nuts (1/4"-28 to 3/8"-24) 250 Flat Washers (For 1/4" to 3/8" Screw Sizes) 250 Split Lock Washers (For 1/4" to 3/8" Screw Sizes) | Fine | Metal Box | 91340A111 | 000000 |
| 1,020 | 315 Hex Head Screws (1/4"-20 to 1/2"-13 in 3/4" to 3" Lengths) 155 Hex Nuts (1/4"-20 to 1/2"-13) 325 Flat Washers (For 1/4" to 1/2" Screw Sizes) 225 Split Lock Washers (For 1/4" to 1/2" Screw Sizes) | Coarse | Metal Drawer Cabinet | 91308A220 | 000000 |
Zinc Yellow-Chromate Plated Grade 8 Steel | |||||
| 910 | 285 Hex Head Screws (1/4"-20 to 3/8"-16 in 1/2" to 2" Lengths) 125 Hex Nuts (1/4"-20 to 3/8"-16) 250 Flat Washers (For 1/4" to 3/8" Screw Sizes) 250 Split Lock Washers (For 1/4" to 3/8" Screw Sizes) | Coarse | Metal Box | 91350A112 | 000000 |
| 910 | 285 Hex Head Screws (1/4"-28 to 3/8"-24 in 1/2" to 2" Lengths) 125 Hex Nuts (1/4"-28 to 3/8"-24) 250 Flat Washers (For 1/4" to 3/8" Screw Sizes) 250 Split Lock Washers (For 1/4" to 3/8" Screw Sizes) | Fine | Metal Box | 91350A317 | 000000 |
| Thread Size | Number of Pieces | Includes | Thread Spacing | Container Type | Each | |
Inch | ||||||
|---|---|---|---|---|---|---|
Zinc-Plated Grade 5 Steel | ||||||
| 1/4"-20 | 615 | 200 Hex Head Screws (1/2" to 3" Lengths) 140 Hex Nuts 190 Flat Washers 85 Split Lock Washers | Coarse | Metal Box | 91340A113 | 000000 |
| 5/16"-18 | 565 | 215 Hex Head Screws (1/2" to 3 1/2" Lengths) 80 Hex Nuts 150 Flat Washers 120 Split Lock Washers | Coarse | Metal Box | 91340A114 | 000000 |
| 3/8"-16 | 555 | 175 Hex Head Screws (3/4" to 3 1/2" Lengths) 120 Hex Nuts 180 Flat Washers 80 Split Lock Washers | Coarse | Metal Box | 91340A115 | 000000 |
| 1/2"-13 | 265 | 90 Hex Head Screws (1" to 4" Lengths) 50 Hex Nuts 65 Flat Washers 60 Split Lock Washers | Coarse | Metal Box | 91340A116 | 000000 |
Zinc Yellow-Chromate Plated Grade 8 Steel | ||||||
| 1/4"-20 | 615 | 200 Hex Head Screws (1/2" to 3" Lengths) 140 Hex Nuts 190 Flat Washers 85 Split Lock Washers | Coarse | Metal Box | 91350A121 | 000000 |
| 3/8"-16 | 555 | 175 Hex Head Screws (3/4" to 3 1/2" Lengths) 120 Hex Nuts 180 Flat Washers 80 Split Lock Washers | Coarse | Metal Box | 91350A122 | 000000 |
| 1/2"-13 | 265 | 90 Hex Head Screws (1" to 4" Lengths) 50 Hex Nuts 65 Flat Washers 60 Split Lock Washers | Coarse | Metal Box | 91350A123 | 000000 |
| 5/8"-11 | 240 | 85 Hex Head Screws (1" to 4" Lengths) 40 Hex Nuts 65 Flat Washers 50 Split Lock Washers | Coarse | Metal Box | 91350A124 | 000000 |
Flanged Hex Head Screw and Nut Assortments
Keep a variety of flanged screws and nuts on hand so you always have the size you need. The flange distributes pressure where the fastener meets a surface, so you don’t need a separate washer. They come in a metal box with a removable tray. Screw length is measured from under the flange.
Grade 5 and Class 8.8 steel fasteners are suitable for fastening most machinery and equipment. They’re plated with either zinc or zinc yellow chromate to resist corrosion in wet environments.
Grade 8 and Class 10.9 steel fasteners can be used in high-stress applications, such as on valves, pumps, and motors. They’re about 25% stronger than Grade 5 and Class 8.8 steel fasteners, but they'll corrode in wet environments.
| Number of Pieces | Includes | Thread Spacing | Specifications Met | Container Type | Each | |
Inch | ||||||
|---|---|---|---|---|---|---|
Zinc-Plated Grade 5 Steel | ||||||
| 480 | 300 Flanged Hex Head Screws (1/4"-20 to 3/8"-16 in 1/2" to 2 1/2" Lengths) 180 Flange Nuts (1/4"-20 to 3/8"-16) | Coarse | ASME B18.2.2, IFI 111, SAE J995 | Metal Box | 91618A111 | 0000000 |
Black-Phosphate Grade 8 Steel | ||||||
| 460 | 290 Flanged Hex Head Screws (1/4"-20 to 1/2"-13 in 1/2" to 2 1/2" Lengths) 170 Flange Nuts (1/4"-20 to 1/2"-13) | Coarse | ASME B18.2.2, IFI 111, SAE J995 | Metal Box | 91618A112 | 000000 |
Serrated-Flange Hex Head Screw and Nut Assortments
 Assortment |  Screw |
 Nut |
Keep screws and nuts in common sizes on hand to create vibration-resistant joints. The fasteners in these assortments have serrated flanges that bite into your material to prevent loosening. Since the flange distributes pressure where the screw or nut meets a surface, you don’t need a separate washer. They come in a metal box with a removable tray. Screw length is measured from under the flange.
Grade 5 and Class 8.8 steel fasteners are suitable for use on most machinery and equipment. They have a zinc plating that resists corrosion in wet environments.
| Number of Pieces | Includes | Thread Spacing | Specifications Met | Container Type | Each | |
Inch | ||||||
|---|---|---|---|---|---|---|
Zinc-Plated Grade 5 Steel | ||||||
| 490 | 310 Serrated-Flange Hex Head Screws (1/4"-20 to 3/8"-16 in 1/2" to 2" Lengths) 180 Serrated Flange Nuts (1/4"-20 to 3/8"-16) | Coarse | ASME B18.2.2, IFI 111, SAE J995 | Metal Box | 91638A113 | 0000000 |