Modified FIN/Trim™ Head Screw to include reverse threading under the head of the fastener.
Screw disappers beneath the surface of the wood composite material, reducing or eliminating the dimple that sometimes appears
Recommended for composite decking projects
Exceptionally small head, along with the W-Cut™ thread design, prevents most material splitting
Pre-drilling is only necessary if the building material's limitations require a pilot hole to be drilled
PDF Downloads
GRK Selection Guide
RT Composite Trim Screw Climatek Options and Quantities
| |
Handy Pak |
Pro Pak |
Bulk Box |
| 4.0 x 50mm |
100 |
725 |
4500 |
| 4.0 x 60mm |
100 |
605 |
3500 |
| 4.0 x 70mm |
100 |
544 |
3000 |
| 4.0 x 80mm |
100 |
514 |
2500 |
| 4.5 x 50mm |
100 |
n/a |
n/a |
| 4.5 x 60mm |
100 |
408 |
2900 |
| 4.5 x 70mm |
100 |
390 |
2000 |
| 4.5 x 80mm |
100 |
348 |
1900 |
PDF Downloads
GRK Selection Guide
GRK Fasteners
RT Trim Head Bulk Box
| Gauge | Length | Box Quantity |
| 4.0 |
50mm |
4500 |
| 4.0 |
60mm |
3500 |
| 4.0 |
70mm |
3000 |
| 4.0 |
80mm |
2500 |
| 4.5 |
60mm |
2900 |
| 4.5 |
70mm |
2000 |
| 4.5 |
80mm |
1900 |
GRK RT Trim™ Climatek™ screws are sold in durable, cardboard "Bulk Boxes" of between 1900 and 4500 screws depending on the size. If you don't need this many screws they are also available in Pro Packs and Handy Packs.
Star Drive Bits
The RT Trim Head Climatek™ screw takes the following bit sizes:
- 4.0 (#8) gauge - T15
- 4.5 (#9), 5.0 (#10) - T25
One star drive bit is supplied free of charge with each 1000 (or part thereof) screws ordered.
Silva Timber is the exclusive distributor for GRK Fasteners™, manufacturer of 'The Industry's Toughest Screws'. All of GRK's products are built to last and have unique labour saving features.
Why use GRK Screws?
GRK Screws are packed with unique features, saving you time and money:
- CEE Thread enlarges the screw hole, increases the drawing strength, reduces friction, lowers the driving torque and reduces splitting
- Drive into hardwoods and softwoods easily without pre-drililng
- W-Cut™ Thread Design - patented design acts like a saw blade, cutting through fibrous materials and reducing the amount of torque required to install the screw
- Zip-Tip™ - designed for fast starts in any fibrous materials
GRK Screws won't fail where others do, driving in effortlessly and significantly reducing the installation time
Climatek™ is exclusive to GRK products. Originally designed for the Navy, GRK has adapted this coating for fasteners and rigourously tests it to meet and exceed all standards. GRK's Climatek™ coating is virtually indistinguishable from brass and its colour matches almost all wood finishes.
GRK Fasteners revolutionary Climatek™ coating is available only on GRK products.
GRK's Climatek™ coating consists of a total of six layers of various materials, including three layers of zinc-polymer.
Climatek™ has been tested for salt spray resistance, and more importantly, for Kesternich durability. Kesternich cycles are a more advanced way of testing a coated material. Each Kesternich cycle simulates heat, cold, wind, water, salt as well as a variety of other elements, whereas salt spray merely uses salt water for its tests.
Climatek™ passed 29 Kesternich cycles, making it the most advanced coating of its kind.
PHEINOX™ stainless steel products are hardened and come with a limited lifetime guarantee against staining and rusting.
