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RT (Reverse Thread) Composite™ 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 inch to 3-1/8 inch.

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


DecksDirect # 5973

GRK RT Trim Head Screw Brochure (446 KB) 

GRK Limited Lifetime Warranty (85 KB) 

Drive TypeStar
Head TypeFin/Trim™
Screw Length2 in, 2-1/2 in, and 3-1/8 in
Screw Size#8

Climatek (gold)

Material TypeClimatek (gold)
Pack Size2 in: 725 pieces (pro pack)
2-1/2 in: 605 pieces (pro pack) & 3,500 pieces (bulk pack)
3-1/8 in: 514 pieces (pro pack) & 2,500 pieces (bulk pack)
Coverage Estimate12 in OC (100 sq ft): 464 screws
16 in OC (100 sq ft): 348 screws
Included Accessories514 Pro Pack, 605 Pro Pack, and 725 Pro Pack: (1) #10 starhead bit
2500 Bulk Pack and 3500 Bulk Pack: none - Starhead bit sold separately
WarrantyView GRK Warranty Information
OtherFor best results, screws should be driven at half speed

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