4.5mm marine grade A4 316 stainless steel wood screws with torx or star drive suitable for oak. double countersunk screws available in extra long lengths. Torx TX20.
Part Thread 
Full Thread 
Cut Point
| 4.5 x 20mm |
| 4.5 x 25mm |
| 4.5 x 30mm |
| 4.5 x 35mm |
| 4.5 x 40mm |
| 4.5 x 45mm |
| 4.5 x 50mm |
| 4.5 x 60mm |
| 4.5 x 65mm |
| 4.5 x 70mm |
| 4.5 x 75mm |
| 4.5 x 80mm |
| 4.5 x 90mm |
| 4.5 x 100mm |
A4 is the best option for coastal regions and woods with high levels of tannin such as Green Oak.
Stainless Steel A4 316 marine grade wood screws with a double countersunk reinforced head.
Available with plain head and sharp point or Ribbed head and cutting tip.