Reverse Thread (RT) Trim Head Screws by GRK Fasteners

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GRK has modified its innovative FIN/Trim Head Screw to include reverse threading under the head of the fastener. After extensive testing, GRK has found that the reverse thread on the RT Composite Trim Head Screw helps the screw disappear beneath the surface of the wood composite material, reducing or eliminating the dimple that sometimes appears when using the FIN/Trim Screw.

GRK's RT Composite Trim Head Screws are ideal for most fine carpentry applications, and are recommended for most composite decking projects and climates. The reverse thread feature is available in sizes from 2 to 31/8.

The RT Composite Trim Head screw's exceptionally small head, along with the W-Cut thread design, prevent most material splitting. Pre-drilling is only necessary if the building material's limitations require a pilot hole to be drilled. (Always consult wood supplier's / manufacturer's recommendations)

RT Composite Trim Head screws come with 1200+ salt spray hours Climatek corrosion protection. This will come in very handy when using our Trim screws in composite decking.


Reverse Thread (RT) Trim Head Screws by GRK Fasteners At-A-Glance:
Works with composite decking, wood decking, window jambs, door jambs and all rim applications
Strong heads and Star head recess
NO pre-drilling
Reverse Thread (RT)
Most composite decks

More Information
DecksDirect # 5973

GRK RT Trim Head Screw Brochure (446 KB) 

GRK Limited Lifetime Warranty (85 KB) 

Drive TypeStar
Head TypeFin/Trim
Screw Length2, 2-1/2, and 3-1/8
Screw Size#8
ColorClimatek (gold)
Material TypeClimatek (gold)
Pack Size2" = 725 pieces (Pro Pack)
2-1/2" = 605 pieces (Pro Pack) & 3,500 pieces (Bulk Pack)
3-1/8" = 514 pieces (Pro Pack) & 2,500 pieces (Bulk Pack)
Coverage Estimate12" OC (100 sq. ft.) = 464 screws
16" OC (100 sq. ft.) = 348 screws
Included Accessories(1) #10 Starhead Bit
WarrantyView GRK Warranty Information
OtherFor best results, screws should be driven at half speed.

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