About Tapping Screws
More
Steel Hex Head Screws for Wood
These steel screws have corrosion-resistant finishes. Also known as lag bolts, they have a hex head for a secure grip with a wrench. They press threads into material for a tight, secure hold. To prevent splitting, drill a pilot hole slightly smaller than the screw. Length is measured from under the head.
Black-oxide steel screws have a coating that protects the steel from rusting in dry environments and blends in with dark surfaces.
Zinc-plated steel screws resist corrosion in wet environments.
Hot-dipped galvanized steel screws have a thick coating for better corrosion resistance than zinc-plated steel screws. They're a good choice for ACQ-treated (arsenic-free) lumber.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | Approximate Threads per Inch | Threading | Minimum Thread Lg. | Specifications Met | Pkg. Qty. | Pkg. | |
Black-Oxide Steel | |||||||||
5/8"  | |||||||||
| 2" | 0.938" | 0.422" | 5 | Partially Threaded | 1 1/2" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 2 1/2" | 0.938" | 0.422" | 5 | Partially Threaded | 1 3/4" | ASME B18.2.1 | 1 | 000000000 | 0000 |
| 3" | 0.938" | 0.422" | 5 | Partially Threaded | 2" | ASME B18.2.1 | 1 | 000000000 | 0000 |
| 4" | 0.938" | 0.422" | 5 | Partially Threaded | 2 1/2" | ASME B18.2.1 | 1 | 000000000 | 0000 |
| 4 1/2" | 0.938" | 0.422" | 5 | Partially Threaded | 2 3/4" | ASME B18.2.1 | 1 | 000000000 | 0000 |
| 5" | 0.938" | 0.422" | 5 | Partially Threaded | 3" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 5 1/2" | 0.938" | 0.422" | 5 | Partially Threaded | 3 1/4" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 6" | 0.938" | 0.422" | 5 | Partially Threaded | 3 1/2" | ASME B18.2.1 | 1 | 000000000 | 00000 |
Zinc-Plated Steel | |||||||||
5/8" | |||||||||
| 3" | 0.938" | 0.422" | 5 | Partially Threaded | 2" | ASME B18.2.1 | 5 | 000000000 | 0000 |
| 4" | 0.938" | 0.422" | 5 | Partially Threaded | 2 1/2" | ASME B18.2.1 | 5 | 000000000 | 00000 |
| 5" | 0.938" | 0.422" | 5 | Partially Threaded | 3" | ASME B18.2.1 | 5 | 000000000 | 00000 |
| 7" | 0.938" | 0.422" | 5 | Partially Threaded | 4" | ASME B18.2.1 | 1 | 000000000 | 0000 |
Hot-Dipped Galvanized Steel | |||||||||
5/8" | |||||||||
| 2 1/2" | 0.938" | 0.422" | 5 | Partially Threaded | 1.667" | ASME B18.2.1, ASTM A307, SAE J429 | 5 | 000000000 | 00000 |
| 3" | 0.938" | 0.422" | 5 | Partially Threaded | 2" | ASME B18.2.1, ASTM A307, SAE J429 | 5 | 000000000 | 00000 |
| 4" | 0.938" | 0.422" | 5 | Partially Threaded | 2.667" | ASME B18.2.1, ASTM A307, SAE J429 | 5 | 000000000 | 00000 |
| 4 1/2" | 0.938" | 0.422" | 5 | Partially Threaded | 3" | ASME B18.2.1, ASTM A307, SAE J429 | 5 | 000000000 | 00000 |
| 5" | 0.938" | 0.422" | 5 | Partially Threaded | 3.333" | ASME B18.2.1, ASTM A307, SAE J429 | 5 | 000000000 | 00000 |
| 6" | 0.938" | 0.422" | 5 | Partially Threaded | 4" | ASME B18.2.1, ASTM A307, SAE J429 | 1 | 000000000 | 0000 |
| 7" | 0.938" | 0.422" | 5 | Partially Threaded | 4.667" | ASME B18.2.1, ASTM A307, SAE J429 | 1 | 000000000 | 0000 |
| 8" | 0.938" | 0.422" | 5 | Partially Threaded | 5.333" | ASME B18.2.1, ASTM A307, SAE J429 | 1 | 000000000 | 0000 |
| 10" | 0.938" | 0.422" | 5 | Partially Threaded | 6.667" | ASME B18.2.1, ASTM A307, SAE J429 | 1 | 000000000 | 0000 |
| 12" | 0.938" | 0.422" | 5 | Partially Threaded | 4" | ASME B18.2.1, ASTM A307, SAE J429 | 1 | 000000000 | 00000 |
| 16" | 0.938" | 0.422" | 5 | Partially Threaded | 4" | ASME B18.2.1, ASTM A307, SAE J429 | 1 | 000000000 | 00000 |
18-8 Stainless Steel Hex Head Screws for Wood
18-8 stainless steel screws have good chemical resistance and are a good choice for ACQ-treated (arsenic-free) lumber. Also known as lag bolts, they have a hex head for a secure grip with a wrench. They press threads into material for a tight, secure hold. To prevent splitting, drill a pilot hole slightly smaller than the screw. They may be mildly magnetic. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | Approximate Threads per Inch | Threading | Minimum Thread Lg. | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||
5/8" | |||||||||
| 2" | 0.938" | 0.422" | 5 | Partially Threaded | 1.333" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 2 1/2" | 0.938" | 0.422" | 5 | Partially Threaded | 1.667" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 3" | 0.938" | 0.422" | 5 | Partially Threaded | 2" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 3 1/2" | 0.938" | 0.422" | 5 | Partially Threaded | 2.333" | ASME B18.2.1 | 1 | 000000000 | 0000 |
| 4" | 0.938" | 0.422" | 5 | Partially Threaded | 2.667" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 5" | 0.938" | 0.422" | 5 | Partially Threaded | 3.333" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 6" | 0.938" | 0.422" | 5 | Partially Threaded | 4" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 7" | 0.938" | 0.422" | 5 | Partially Threaded | 4.667" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 8" | 0.938" | 0.422" | 5 | Partially Threaded | 5.333" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 10" | 0.938" | 0.422" | 5 | Partially Threaded | 4" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 12" | 0.938" | 0.422" | 5 | Partially Threaded | 4" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 16" | 0.938" | 0.422" | 5 | Partially Threaded | 4" | ASME B18.2.1 | 1 | 000000000 | 00000 |
Super-Corrosion-Resistant 316 Stainless Steel Hex Head Screws for Wood
More corrosion resistant than 18-8 stainless steel screws, these have excellent resistance to chemicals and salt water and are a good choice for ACQ-treated (arsenic-free) lumber. Also known as lag bolts, they have a hex head for a secure grip with a wrench. They press threads into material for a tight, secure hold. To prevent splitting, drill a pilot hole slightly smaller than the screw. They may be mildly magnetic. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | Approximate Threads per Inch | Threading | Minimum Thread Lg. | Specifications Met | Pkg. Qty. | Pkg. | |
316 Stainless Steel | |||||||||
5/8" | |||||||||
| 2 1/2" | 0.938" | 0.422" | 5 | Partially Threaded | 1.667" | ASME B18.2.1 | 1 | 000000000 | 000000 |
| 3" | 0.938" | 0.422" | 5 | Partially Threaded | 2" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 4" | 0.938" | 0.422" | 5 | Partially Threaded | 2.667" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 5" | 0.938" | 0.422" | 5 | Partially Threaded | 3.333" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 6" | 0.938" | 0.422" | 5 | Partially Threaded | 4" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 7" | 0.938" | 0.422" | 5 | Partially Threaded | 4.667" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 8" | 0.938" | 0.422" | 5 | Partially Threaded | 4" | ASME B18.2.1 | 1 | 000000000 | 00000 |
| 10" | 0.938" | 0.422" | 5 | Partially Threaded | 4" | ASME B18.2.1 | 1 | 000000000 | 00000 |