Reverse Thread (RT) Trim Head Screws by GRK Fasteners

Reverse Thread (RT) Trim Head Screws by GRK Fasteners

DecksDirect Item #5973

Reverse Thread (RT) Trim Head Screws by GRK Fasteners

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Starting at: $44.99

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 Durable Quality   DIY Friendly   Industry Leader 

GRK Fasteners offer hardware featuring exclusive weather-sealant and no pre-drilling... Learn More



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 3"1/8.

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

Product Specifications

Drive TypeStar
Head TypeFin/Trim
Screw Length2", 2-1/2", 2-3/4" and 3-1/8"
Screw Size#8
ColorsClimatek (gold)
Material TypeClimatek (gold)
Pack Size2" = 725 pieces (Pro Pack) &4,500 pieces (Bulk Pack)
2-1/2" = 605 pieces (Pro Pack) & 3,500 pieces (Bulk Pack)
2-3/4" = 544 pieces (Pro Pack) & 3, 000 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.

Additional Information

Additional Information

DecksDirect Item # 5973
Manufacturer GRK Fasteners

GRK RT Trim Head Screw Brochure (446 KB) 

GRK Limited Lifetime Warranty (85 KB) 


GRK logo

GRK Fasteners feature exclusive weather sealant and require no pre-drilling to exceed expectations without breaking the bank. Founded in 1990, GRK Fasteners produces unique, high-quality deck screws for use in wood, metal, and concrete projects.


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GRK Fasteners offer unmatched versatility, from the tiniest trim screw to extra large structural screws. Each item goes through GRK's exclusive Climatex three-coat process, protecting the screws from rain, snow, cold, and heat.


GRK Fasteners are often the top choice for builders as their products are dependable and innovative, available here at


Features and Benefits
  Durable Quality This brand offers products that are built to last and withstand the elements.
  DIY Friendly This brand is reliable and easy-to-install for professionals and DIYers alike.
  Industry Leader This brand is known globally as a leader in premium decking products.
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