Model # 112221

Internet #203533461

Store SKU #517498

GRK Fasteners 5/16 in. x 3-1/8 in. Rugged Structural Screw (45-Piece per Pack)
0628611122210

GRK Fasteners

5/16 in. x 3-1/8 in. Rugged Structural Screw (45-Piece per Pack)

  • Great alternative to lag screws - features no sharp edges
  • Bites instantly into material to reduce splitting
  • Durably crafted from Climatek-coated hardened steel
$19.98 /each

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Product Overview

GRK Fasteners RSS screw is made from Climatek coated and hardened steel. Its sharp threads and point bite instantly into material (including hardwood), reducing the splitting effect caused by smaller shanks. Its washer type head has no sharp edges like conventional lag screws, and the added shoulder underneath the washer has the ability to center the RSS screw in predrilled hardware.

  • Ideal for ledger boards and more
  • Self-tapping
  • W-cut thread design
  • May be used as a lag screw alternative

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Customer Questions & Answers

Can this fastner be used in #3 or #2 pressure treated wood?

Asked by: Howard
Thank you for your question. GRK Rugged Structural Screws are Climatek coated and have been approved for use in #2 or #3 pressure treated wood. If you have additional questions about GRK fasteners, please call Customer Support at 877-489-2726 from 8:00 - 5:00 CT Monday - Friday.
Answered by: Paslode
Date published: 2016-08-24

Is an impact cordless tool needed to install these?

For the driving tool needed, it would help to know how much torque or the voltage specification that we should look for in a cordless tool.
Asked by: Paul
I've driven these through drywall into studs to support a heavy shelf with the Milwaukee M12 Brushless Impact driver. The impact was plenty strong to get a nice secure fasten, however if you were doing many of these, you may want to step it up to an 18v or plug-in driver. Overall, a good 12v impact will work just fine for a few of these.
Answered by: Steve
Date published: 2017-01-07

Can these screws be used with hardwoods such as oak?

Asked by: hardwood
Yes, however you'll probably want to pre-drill. These are very aggressive screws and have a wide diameter, so if it's screwed into hardwoods without a pilot hole, the wood may crack. Definitely do a test piece with the same grain orientation to ensure no cracking.
Answered by: Steve
Date published: 2017-01-07
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Customer Reviews

5/16 in. x 3-1/8 in. Rugged Structural Screw (45-Piece per Pack) is rated 5.0 out of 5 by 5.
Rated 5 out of 5 by from Insanely heavy duty. I'm not a structural contractor or someone who needs these to hold up a hou... Insanely heavy duty. I'm not a structural contractor or someone who needs these to hold up a house, but I hung a few heavy shelves by driving these screws into studs. Wow, I'm sure the wall will fall down before these screws give up.
Date published: 2017-01-06
Rated 5 out of 5 by from Awesome Product! Awesome Product!
Date published: 2017-03-07
Rated 5 out of 5 by from Grat Purchase These screws are a bit pricey but are worth it they are the best screws I have ever used
Date published: 2016-06-21
Rated 5 out of 5 by from Step up This is not your fathers lag bolt. These are fast, strong and very easy to use.....,if you have an impact driver. The only bad part, they are not available in all Home Depot stores
Date published: 2016-02-19
Rated 5 out of 5 by from Awesome Time Saver Bought two boxes of these and they made quick work for mounting a new RubberMaid FastTrack system, as well as some home-made garage shelving. The self-drilling action on these cuts through wood and drywall like butter. I liked that the screws have a hex/star head (rather than phillips) with an included bit. The screws fit snug to the bit so your other hand is free to hold the material in place.
Date published: 2013-01-15
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