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About Hex Head Screws and Bolts
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High-Strength Grade 8 Steel Square-Neck Carriage Bolts
Made from Grade 8 steel, these bolts are at least 25% stronger than medium-strength steel bolts and can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. A square neck keeps these bolts from turning when tightening a nut. A smooth, rounded head provides a finished look. A zinc yellow-chromate plating provides corrosion resistance in wet environments. Grade 8 steel bolts are marked with six radial lines. Material meets SAE J429 specifications for quality. Dimensions meet ASME B18.5 specifications. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Head | Neck | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing | Dia. | Ht. | Wd. | Lg. | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc Yellow-Chromate Plated Grade 8 Steel | |||||||||||
1/4"-20 | |||||||||||
| 3/4" | Fully Threaded | Coarse | 0.594" | 0.145" | 0.26" | 0.16" | 150,000 | ASME B18.5, SAE J429 | 50 | 000000000 | 00000 |
| 1" | Fully Threaded | Coarse | 0.594" | 0.145" | 0.26" | 0.16" | 150,000 | ASME B18.5, SAE J429 | 50 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | Coarse | 0.594" | 0.145" | 0.26" | 0.16" | 150,000 | ASME B18.5, SAE J429 | 50 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | 0.594" | 0.145" | 0.26" | 0.16" | 150,000 | ASME B18.5, SAE J429 | 50 | 000000000 | 0000 |
| 2" | Fully Threaded | Coarse | 0.594" | 0.145" | 0.26" | 0.16" | 150,000 | ASME B18.5, SAE J429 | 50 | 000000000 | 00000 |
5/16"-18 | |||||||||||
| 3/4" | Fully Threaded | Coarse | 0.719" | 0.176" | 0.32" | 0.19" | 150,000 | ASME B18.5, SAE J429 | 50 | 000000000 | 00000 |
| 1" | Fully Threaded | Coarse | 0.719" | 0.176" | 0.32" | 0.19" | 150,000 | ASME B18.5, SAE J429 | 50 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | 0.719" | 0.176" | 0.32" | 0.19" | 150,000 | ASME B18.5, SAE J429 | 50 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | 0.719" | 0.176" | 0.32" | 0.19" | 150,000 | ASME B18.5, SAE J429 | 50 | 000000000 | 00000 |
| 2" | Fully Threaded | Coarse | 0.719" | 0.176" | 0.32" | 0.19" | 150,000 | ASME B18.5, SAE J429 | 25 | 000000000 | 0000 |
| 3" | Fully Threaded | Coarse | 0.719" | 0.176" | 0.32" | 0.19" | 150,000 | ASME B18.5, SAE J429 | 25 | 000000000 | 00000 |
3/8"-16 | |||||||||||
| 1" | Fully Threaded | Coarse | 0.844" | 0.208" | 0.39" | 0.22" | 150,000 | ASME B18.5, SAE J429 | 50 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | 0.844" | 0.208" | 0.39" | 0.22" | 150,000 | ASME B18.5, SAE J429 | 50 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | 0.844" | 0.208" | 0.39" | 0.22" | 150,000 | ASME B18.5, SAE J429 | 25 | 000000000 | 00000 |
| 2" | Fully Threaded | Coarse | 0.844" | 0.208" | 0.39" | 0.22" | 150,000 | ASME B18.5, SAE J429 | 25 | 000000000 | 00000 |
| 2 1/2" | Fully Threaded | Coarse | 0.844" | 0.208" | 0.39" | 0.22" | 150,000 | ASME B18.5, SAE J429 | 25 | 000000000 | 00000 |
| 3" | Fully Threaded | Coarse | 0.844" | 0.208" | 0.39" | 0.22" | 150,000 | ASME B18.5, SAE J429 | 25 | 000000000 | 00000 |
1/2"-13 | |||||||||||
| 1 1/2" | Fully Threaded | Coarse | 1.094" | 0.27" | 0.52" | 0.28" | 150,000 | ASME B18.5, SAE J429 | 10 | 000000000 | 0000 |
| 2" | Fully Threaded | Coarse | 1.094" | 0.27" | 0.52" | 0.28" | 150,000 | ASME B18.5, SAE J429 | 10 | 000000000 | 00000 |
| 2 1/2" | Fully Threaded | Coarse | 1.094" | 0.27" | 0.52" | 0.28" | 150,000 | ASME B18.5, SAE J429 | 10 | 000000000 | 00000 |
| 3" | Fully Threaded | Coarse | 1.094" | 0.27" | 0.52" | 0.28" | 150,000 | ASME B18.5, SAE J429 | 10 | 000000000 | 00000 |
| 3 1/2" | Fully Threaded | Coarse | 1.094" | 0.27" | 0.52" | 0.28" | 150,000 | ASME B18.5, SAE J429 | 10 | 000000000 | 00000 |
| 4" | Fully Threaded | Coarse | 1.094" | 0.27" | 0.52" | 0.28" | 150,000 | ASME B18.5, SAE J429 | 10 | 000000000 | 00000 |
High-Strength Grade 8 Steel Square Head Screws
Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. Large flat sides make them easy to grip with a wrench and keep them from rotating in square holes. A zinc yellow-chromate plating provides corrosion resistance in wet environments. Grade 8 steel square head screws are marked with six radial lines. Dimensions meet ASME B18.2.1 specifications. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing | Wd. | Ht. | Tensile Strength, psi | Specifications Met | Each | |
Zinc Yellow-Chromate Plated Grade 8 Steel | ||||||||
1/4"-20 | ||||||||
| 3/4" | Fully Threaded | Coarse | 3/8" | 11/64" | 150,000 | ASME B18.2.1 | 000000000 | 000000 |
| 1" | Fully Threaded | Coarse | 3/8" | 11/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | 3/8" | 11/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | 3/8" | 11/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
5/16"-18 | ||||||||
| 3/4" | Fully Threaded | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 1" | Fully Threaded | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | 1/2" | 13/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
3/8"-16 | ||||||||
| 1" | Fully Threaded | Coarse | 9/16" | 1/4" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | 9/16" | 1/4" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | 9/16" | 1/4" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 2" | Fully Threaded | Coarse | 9/16" | 1/4" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 2 1/2" | Fully Threaded | Coarse | 9/16" | 1/4" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 3" | Fully Threaded | Coarse | 9/16" | 1/4" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
1/2"-13 | ||||||||
| 1" | Fully Threaded | Coarse | 3/4" | 21/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | 3/4" | 21/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | 3/4" | 21/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 2" | Fully Threaded | Coarse | 3/4" | 21/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 2 1/2" | Fully Threaded | Coarse | 3/4" | 21/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 3" | Fully Threaded | Coarse | 3/4" | 21/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 3 1/2" | Fully Threaded | Coarse | 3/4" | 21/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 4" | Fully Threaded | Coarse | 3/4" | 21/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
5/8"-11 | ||||||||
| 2" | Fully Threaded | Coarse | 15/16" | 27/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 2 1/2" | Fully Threaded | Coarse | 15/16" | 27/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
| 3" | Fully Threaded | Coarse | 15/16" | 27/64" | 150,000 | ASME B18.2.1 | 000000000 | 00000 |
Square-Neck Oval Head Plow Bolts
These bolts have a thicker, domed head that provides greater wear resistance than flat head bolts. Used on heavy equipment, such as plows, these bolts are angled under the head to sit nearly flush within countersunk holes. A square neck keeps them from turning when tightening a nut. The zinc yellow-chromate plating provides corrosion resistance in wet environments. Material meets SAE J429 specifications for quality. Length is measured from the base of the oval top. Head height includes the neck and oval top.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing | Dia. | Ht. | Oval Top Ht. | Countersink Angle | Neck Wd. | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc Yellow-Chromate Plated Grade 8 Steel | |||||||||||||
5/8"-11 | |||||||||||||
| 1 1/2" | Fully Threaded | __ | Coarse | 1.044" | 0.616" | 0.1" | 82° | 0.64" | 150,000 | SAE J429 | 10 | 000000000 | 000000 |
| 2" | Fully Threaded | __ | Coarse | 1.044" | 0.616" | 0.1" | 82° | 0.64" | 150,000 | SAE J429 | 10 | 000000000 | 00000 |
| 2 1/4" | Fully Threaded | __ | Coarse | 1.044" | 0.616" | 0.1" | 82° | 0.64" | 150,000 | SAE J429 | 10 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/2" | Coarse | 1.044" | 0.616" | 0.1" | 82° | 0.64" | 150,000 | SAE J429 | 5 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | 1 1/2" | Coarse | 1.044" | 0.616" | 0.1" | 82° | 0.64" | 150,000 | SAE J429 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | 1 1/2" | Coarse | 1.044" | 0.616" | 0.1" | 82° | 0.64" | 150,000 | SAE J429 | 5 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | 1 1/2" | Coarse | 1.044" | 0.616" | 0.1" | 82° | 0.64" | 150,000 | SAE J429 | 5 | 000000000 | 00000 |
| 4" | Partially Threaded | 1 1/2" | Coarse | 1.044" | 0.616" | 0.1" | 82° | 0.64" | 150,000 | SAE J429 | 1 | 000000000 | 0000 |
3/4"-10 | |||||||||||||
| 2" | Fully Threaded | __ | Coarse | 1.2" | 0.691" | 0.11" | 82° | 0.77" | 150,000 | SAE J429 | 5 | 000000000 | 00000 |
| 2 1/4" | Fully Threaded | __ | Coarse | 1.2" | 0.691" | 0.11" | 82° | 0.77" | 150,000 | SAE J429 | 1 | 000000000 | 0000 |
| 2 1/2" | Fully Threaded | __ | Coarse | 1.2" | 0.691" | 0.11" | 82° | 0.77" | 150,000 | SAE J429 | 5 | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | 1 3/4" | Coarse | 1.2" | 0.691" | 0.11" | 82° | 0.77" | 150,000 | SAE J429 | 5 | 000000000 | 00000 |
| 3" | Partially Threaded | 1 3/4" | Coarse | 1.2" | 0.691" | 0.11" | 82° | 0.77" | 150,000 | SAE J429 | 5 | 000000000 | 00000 |
| 3 1/2" | Partially Threaded | 1 3/4" | Coarse | 1.2" | 0.691" | 0.11" | 82° | 0.77" | 150,000 | SAE J429 | 5 | 000000000 | 00000 |
| 4" | Partially Threaded | 1 3/4" | Coarse | 1.2" | 0.691" | 0.11" | 82° | 0.77" | 150,000 | SAE J429 | 1 | 000000000 | 0000 |
Key-Locking Plow Bolts
Also known as reverse-key plow screws and bucket-tooth bolts, these bolts have a locking key that keeps them from turning when tightening a nut. Often used on heavy equipment, such as plows, they have a smooth, flat head that's angled underneath to sit flush within countersunk holes. Material meets SAE J429 specifications for quality. Length is measured from the top of the head.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Dia. | Ht. | Tensile Strength, psi | Specifications Met | Each | |
Grade 8 Steel | ||||||||
5/8"-11 | ||||||||
| 2" | Fully Threaded | __ | 1.121" | 0.414" | 150,000 | SAE J429 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/2" | 1.121" | 0.414" | 150,000 | SAE J429 | 000000000 | 0000 |
| 3" | Partially Threaded | 1 1/2" | 1.121" | 0.414" | 150,000 | SAE J429 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | 1 1/2" | 1.121" | 0.414" | 150,000 | SAE J429 | 000000000 | 0000 |
| 4" | Partially Threaded | 1 1/2" | 1.121" | 0.414" | 150,000 | SAE J429 | 000000000 | 0000 |
| 5" | Partially Threaded | 1 1/2" | 1.121" | 0.414" | 150,000 | SAE J429 | 000000000 | 0000 |
3/4"-10 | ||||||||
| 3" | Partially Threaded | 1 3/4" | 1.277" | 0.44" | 150,000 | SAE J429 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | 1 3/4" | 1.277" | 0.44" | 150,000 | SAE J429 | 000000000 | 0000 |
| 4" | Partially Threaded | 1 3/4" | 1.277" | 0.44" | 150,000 | SAE J429 | 000000000 | 0000 |
| 4 1/2" | Partially Threaded | 1 3/4" | 1.277" | 0.44" | 150,000 | SAE J429 | 000000000 | 00000 |
| 5" | Partially Threaded | 1 3/4" | 1.277" | 0.44" | 150,000 | SAE J429 | 000000000 | 00000 |
| 6" | Partially Threaded | 1 3/4" | 1.277" | 0.44" | 150,000 | SAE J429 | 000000000 | 00000 |
7/8"-9 | ||||||||
| 3 1/2" | Partially Threaded | 2" | 1.516" | 0.616" | 150,000 | SAE J429 | 000000000 | 00000 |
| 4" | Partially Threaded | 2" | 1.516" | 0.616" | 150,000 | SAE J429 | 000000000 | 00000 |
| 4 1/2" | Partially Threaded | 2" | 1.516" | 0.616" | 150,000 | SAE J429 | 000000000 | 00000 |