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#8 x 3-1/8 in. Star Drive Trim-Head RT Composite Finish Screw (100 per Pack)

  • Reverse thread design prevents mushrooming
  • Trim Head provides a clean finished look
  • Zip-Tip allows for one step installation with no pre-drilling
  • See More Details

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Product Overview

GRK Fasteners #8 x 3-1/8 in. RT Trim Screws (100-Pack) are Climate coated for corrosion resistance and are suitable for composite decking and trim applications. The screw's small diameter and Zip Tip are designed to prevent most building materials from splitting. The small diameter head allows for a clean finish.
  • For composite decking applications
  • Climate coated for corrosion resistance
  • Includes 100-screws
  • Zip tip self-tapping screws with W-cut threads help prevent wood splitting
  • Note: product may vary by store

Info & Guides

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BrandGRK FastenersGRK FastenersGRK Fasteners
Name#8 x 1-1/4 in. Star Drive Trim-Head Finish Screw (100-Pack)#8 x 3-1/8 in. Star Drive Trim-Head RT Composite Finish Screw (100 per Pack)#9 x 5 in. Star Drive Trim Finishing Head Screw (50-per Pack)
Price
Ratings
(194)
(83)
(61)
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Specifications

Dimensions

Screw Length
3-1/8 in
Thread Pitch
0

Details

Color Family
Yellow
Drive Style
Star
Fastener Plating
Zinc
Fastener Type
Specialty Fastener
Fastener/Connector Material
Steel
Features
Coated,Self Drilling,Self Tapping
Finish
Climatek
Finish Family
Yellow
Head Style
Trim
Included
Driver Bit
Interior/Exterior
Exterior,Interior
Measurement Standard
SAE
Package Quantity
100
Product Weight (lb.)
.01 lb
Returnable
90-Day
Size
#8

Warranty / Certifications

Manufacturer Warranty
No

Questions & Answers

16Questions23Answers

Okay good for exterior fiber cement

Asked by Danny June 11, 2021
0
Answers

Would these work well for tongue and groove exterior siding?

Asked by Prairis April 28, 2021
1
Answer

These are more comparable to "Finishing nails" with small heads. I am not sure what kind of Tongue and Groove siding you are working with.. If you are in a wind zone or just where or how you are installing the siding. but IF the small head is not an issue these are great. I use them in place of finishing nails because they have much greater holding power and only leave a small hole in the surface that can be filled and stained/painted for a finished surface.

Can you use them on molding

Asked by Teddy January 24, 2021
2
Answers

Brick mould, yes.

Can these screws be used for red cedar? Thanks.

Asked by Bill July 22, 2020
1
Answer

would say "yes". These do hold really well and the only comment I might suggest is the heads might show (because of color). but, again, that said.. I would use them.

why are the theads below the head reverse of the leading threads?

Asked by charles August 13, 2019
1
Answer

Hi Charles, the threads below the head allow the fastener to pull composite material down during installation to avoid "mushrooming" or dimpling of the composite material. If you require a standard trim head screw, the GRK FIN/Trim fasteners do not have the reverse thread at the top. If you have any further questions, please contact customer service at 877-489-2726. Thanks!

Can these screws be used as a substitute for Camo hidden deck screws? They appear to be approxima...

Asked by Jakewade March 12, 2019
2
Answers

Yes

Is this a T10 screw?

Asked by Reynolds January 15, 2019
5
Answers

Yes

Will these screw into steel without a pre-drilled hole?

Asked by Dock June 16, 2018
3
Answers

Depends on what metal your drilling into. Thin sheet metal and these will drive through, they are sharp and strong. These are not going to "grip" metal well, so I wouldn't use them on anything that is thick.

Can these screws be used on pressure treated wood

Asked by WillieBoy April 11, 2018
3
Answers

Yes. They are trim screws...

Can these be used to screw stair treads and risers?

Asked by Chas January 25, 2018
5
Answers

I would think so. The heads prety much dissapear and their holding properties are excellent.

#8 x 3-1/8 in. Star Drive Trim-Head RT Composite Finish Screw (100 per Pack) - page 2

Customer Reviews

  • 4.7
    out of 83 reviews
  • 100% recommend this product
Filter by:
Showing 1-10 of 83 reviews
This product works wander full love it, It makes my days so much easier thank you guys great prod...
This product works wander full love it, It makes my days so much easier thank you guys great product.
by Me
These fasteners were exactly what I needed to secure 2x6 boards with toenailed screws and not lea...
These fasteners were exactly what I needed to secure 2x6 boards with toenailed screws and not leave a head showing, since I could countersink them all just a bit, and I will cover them with putty to keep the wood watersealed. They have great bite as they go in, and do a nice job of securing these boards. This is a redo of a screened porch before placing new SCREEN TIGHT system (also from HD) on the inside of the porch, and on the face of these boards and the existing trim. New boards are at the base, and I will be adding 2x4's with same screws to mid point. Old external wooden screens in the photo can be removed after I install the new system.
by Ken
These fasteners are very designed and work exactly as advertised....
These fasteners are very designed and work exactly as advertised. Would recommend them to anyone who needs alot of holding power in a small design.
by HomeDepotCustomer
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
I prefer these for areas where one might otherwise use...
I prefer these for areas where one might otherwise use a sink-head nail. They hold well and give me more control over their positioning and, where needed, removal.
by Dirk
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
Good fastener if you are looking for a longer trim...
Good fastener if you are looking for a longer trim screw. I still predrilled to ensure I didn’t split the wood. The star drive provides a secure method to screw it in.
by GREG
I bought them, to install my new crown molding.That I...
I bought them, to install my new crown molding.That I put up, in my master bedroom. I give G.R.K. - R.T. -3 1/8" Trim Head screws. A perfect 5 star rating! They worked flawlessly!
by SHO
Showing 1-10 of 83 reviews