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18-8 Stainless Steel Square-Drive Screws
for Softwood and Plastic-Wood Composites
18-8 stainless steel screws have good chemical resistance and are a good choice for ACQ-treated (arsenic-free) lumber. They have a curved neck that sinks into material, so they sit flush with the surface. Also known as deck screws, they have a Type 17 auger point that penetrates softwood and plastic-wood composite decking material. They may be mildly magnetic. Length is measured from the top of the head.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Dia. | Ht. | Drive Size | Drill Bit Size | Approximate Threads per Inch | Threading | Min. Thread Lg. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel  | ||||||||||
No. 6 | ||||||||||
| 5/8" | 0.344" | 0.197" | No. 2 | 1/16" | 9 | Partially Threaded | 0.413" | 100 | 000000000 | 000000 |
| 3/4" | 0.344" | 0.197" | No. 2 | 1/16" | 9 | Partially Threaded | 0.495" | 100 | 000000000 | 00000 |
| 1" | 0.344" | 0.197" | No. 2 | 1/16" | 9 | Partially Threaded | 0.66" | 100 | 000000000 | 00000 |
| 1 1/4" | 0.344" | 0.197" | No. 2 | 1/16" | 9 | Partially Threaded | 0.825" | 100 | 000000000 | 00000 |
| 1 1/2" | 0.344" | 0.197" | No. 1 | 1/16" | 18 | Partially Threaded | 1" | 100 | 000000000 | 00000 |
| 1 5/8" | 0.344" | 0.197" | No. 2 | 1/16" | 9 | Partially Threaded | 1.073" | 100 | 000000000 | 00000 |
| 2" | 0.344" | 0.197" | No. 2 | 1/16" | 18 | Partially Threaded | 1 1/4" | 100 | 000000000 | 00000 |
No. 8 | ||||||||||
| 3/4" | 0.344" | 0.192" | No. 2 | 5/64" | 8 | Partially Threaded | 0.495" | 100 | 000000000 | 00000 |
| 1" | 0.344" | 0.192" | No. 2 | 5/64" | 15 | Partially Threaded | 3/4" | 100 | 000000000 | 0000 |
| 1 1/4" | 0.344" | 0.192" | No. 2 | 5/64" | 8 | Partially Threaded | 0.825" | 100 | 000000000 | 00000 |
| 1 1/2" | 0.344" | 0.192" | No. 2 | 5/64" | 15 | Partially Threaded | 1" | 100 | 000000000 | 00000 |
| 1 5/8" | 0.344" | 0.192" | No. 2 | 5/64" | 8 | Partially Threaded | 1.073" | 50 | 000000000 | 00000 |
| 1 3/4" | 0.344" | 0.192" | No. 2 | 5/64" | 15 | Partially Threaded | 1 3/16" | 100 | 000000000 | 00000 |
| 2" | 0.344" | 0.192" | No. 2 | 5/64" | 8 | Partially Threaded | 1.32" | 50 | 000000000 | 00000 |
| 2 1/2" | 0.344" | 0.192" | No. 2 | 5/64" | 8 | Partially Threaded | 1.65" | 50 | 000000000 | 00000 |
| 2 3/4" | 0.344" | 0.192" | No. 2 | 5/64" | 15 | Partially Threaded | 1 27/32" | 50 | 000000000 | 00000 |
| 3" | 0.344" | 0.192" | No. 2 | 5/64" | 8 | Partially Threaded | 1.98" | 50 | 000000000 | 00000 |
No. 10 | ||||||||||
| 1" | 0.344" | 0.189" | No. 2 | 3/32" | 8 | Partially Threaded | 0.66" | 100 | 000000000 | 00000 |
| 1 1/4" | 0.344" | 0.189" | No. 2 | 3/32" | 8 | Partially Threaded | 0.825" | 100 | 000000000 | 00000 |
| 1 1/2" | 0.344" | 0.189" | No. 2 | 3/32" | 8 | Partially Threaded | 0.99" | 50 | 000000000 | 00000 |
| 1 5/8" | 0.344" | 0.189" | No. 2 | 3/32" | 13 | Partially Threaded | 1 1/8" | 50 | 000000000 | 00000 |
| 1 3/4" | 0.344" | 0.189" | No. 2 | 3/32" | 8 | Partially Threaded | 1.155" | 50 | 000000000 | 00000 |
| 2" | 0.344" | 0.189" | No. 2 | 3/32" | 8 | Partially Threaded | 1.32" | 50 | 000000000 | 00000 |
| 2 1/4" | 0.344" | 0.189" | No. 2 | 3/32" | 13 | Partially Threaded | 1 1/2" | 50 | 000000000 | 00000 |
| 2 1/2" | 0.344" | 0.189" | No. 2 | 3/32" | 8 | Partially Threaded | 1.65" | 25 | 000000000 | 00000 |
| 2 3/4" | 0.344" | 0.189" | No. 2 | 3/32" | 13 | Partially Threaded | 1 27/32" | 25 | 000000000 | 0000 |
| 3" | 0.344" | 0.189" | No. 2 | 3/32" | 8 | Partially Threaded | 1.98" | 25 | 000000000 | 00000 |
| 3 3/4" | 0.344" | 0.189" | No. 2 | 3/32" | 8 | Partially Threaded | 2.475" | 25 | 000000000 | 00000 |
| 4" | 0.344" | 0.189" | No. 2 | 3/32" | 13 | Partially Threaded | 2 3/4" | 25 | 000000000 | 00000 |
No. 12 | ||||||||||
| 2" | 0.43" | 0.203" | No. 3 | 7/64" | 11 | Partially Threaded | 1 1/4" | 25 | 000000000 | 0000 |
| 2 1/2" | 0.43" | 0.203" | No. 3 | 7/64" | 7 | Partially Threaded | 1.65" | 25 | 000000000 | 00000 |
| 3 1/2" | 0.43" | 0.203" | No. 3 | 7/64" | 7 | Partially Threaded | 2.31" | 10 | 000000000 | 00000 |
| 4" | 0.43" | 0.203" | No. 3 | 7/64" | 7 | Partially Threaded | 2.64" | 10 | 000000000 | 00000 |
| 4 1/2" | 0.43" | 0.203" | No. 3 | 7/64" | 7 | Partially Threaded | 2.97" | 10 | 000000000 | 00000 |
| 5 1/2" | 0.43" | 0.203" | No. 3 | 7/64" | 11 | Partially Threaded | 3.688" | 10 | 000000000 | 0000 |
| 6" | 0.43" | 0.203" | No. 3 | 7/64" | 7 | Partially Threaded | 3.96" | 10 | 000000000 | 00000 |
No. 14 | ||||||||||
| 2" | 0.43" | 0.25" | No. 3 | 7/64" | 10 | Partially Threaded | 1 1/4" | 25 | 000000000 | 00000 |
| 2 1/2" | 0.43" | 0.25" | No. 3 | 7/64" | 10 | Partially Threaded | 1 3/4" | 10 | 000000000 | 0000 |
| 3" | 0.43" | 0.25" | No. 3 | 7/64" | 10 | Partially Threaded | 2" | 10 | 000000000 | 0000 |
| 3 1/2" | 0.43" | 0.25" | No. 3 | 7/64" | 7 | Partially Threaded | 2.31" | 10 | 000000000 | 00000 |
| 4" | 0.43" | 0.25" | No. 3 | 7/64" | 7 | Partially Threaded | 2.64" | 10 | 000000000 | 00000 |
| 4 1/2" | 0.43" | 0.25" | No. 3 | 7/64" | 10 | Partially Threaded | 2 11/16" | 10 | 000000000 | 00000 |
| 5" | 0.43" | 0.25" | No. 3 | 7/64" | 7 | Partially Threaded | 3.3" | 10 | 000000000 | 00000 |
| 6" | 0.43" | 0.25" | No. 3 | 7/64" | 10 | Partially Threaded | 4" | 5 | 000000000 | 0000 |