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)

  • 1 step install, no pre-drilling
  • Superior clamping force on the first drive
  • 20% faster drive time
$1971 /each
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Frequently Bought Together

Product Overview

  • 1 step install, no pre-drilling
  • Superior clamping force on the first drive
  • 20% faster drive time
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

Product Overview

  • 1 step install, no pre-drilling
  • Superior clamping force on the first drive
  • 20% faster drive time
Model #: 112221
Sku #: 517498
Internet #: 203533461

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

Info & Guides

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Name 5/16 in. x 3-1/8 in. Rugged Structural Screw (45-Piece per Pack) 5/16 in. x 5-1/8 in. Rugged Structural Screw (40-Piece per Pack) 8 in. x 3-1/8 in. Cabinet Screw ( 270-Piece Per Pack) HeadLok 4-1/2 in. Heavy Duty Flathead Fastener (50-Box)
Brand GRK Fasteners GRK Fasteners GRK Fasteners FastenMaster
Ratings (5) (6) (0) (7)
Drive Style Star Star Star Star
Fastener/Connector Material Steel Steel Steel Steel
Size 5/16 in 5/16 in #8 5/8 in
Screw Length 3-1/8 in 5-1/8 in 3-1/8 in 4-1/2 in
Fastener Thread Type CEE Type CEE Type W-Cut Coarse
Head Style Round Round Flat Flat
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Specifications

Dimensions

Screw Length
3-1/8 in

Details

ACQ Rated Fastener
Yes
Coated
Y
Drive Style
Star
Driver bit included
Yes
Fastener Callout Size
5/16 x3-1/8
Fastener Plating
Polymer
Fastener Thread Type
CEE Type
Fastener Type
Specialty Fastener
Fastener/Connector Material
Steel
Finish
Climatek coating
Finish Family
Metallic
Head Style
Round
Indoor/Outdoor
Indoor/Outdoor
Measurement Standard
SAE
Package Quantity
45
Primary Use
Ledger boards
Product Weight (lb.)
0.036lb
Self drilling
Yes
Self tapping
Yes
Size
5/16 in
Tamper Resistant
No

Warranty / Certifications

Manufacturer Warranty
No

Specifications

Dimensions

Screw Length
3-1/8 in

Details

ACQ Rated Fastener
Yes
Coated
Y
Drive Style
Star
Driver bit included
Yes
Fastener Callout Size
5/16 x3-1/8
Fastener Plating
Polymer
Fastener Thread Type
CEE Type
Fastener Type
Specialty Fastener
Fastener/Connector Material
Steel
Finish
Climatek coating
Finish Family
Metallic
Head Style
Round
Indoor/Outdoor
Indoor/Outdoor
Measurement Standard
SAE
Package Quantity
45
Primary Use
Ledger boards
Product Weight (lb.)
0.036lb
Self drilling
Yes
Self tapping
Yes
Size
5/16 in
Tamper Resistant
No

Warranty / Certifications

Manufacturer Warranty
No

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: BrandAnswers
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

These were recommended to me rather than normal galvanized 1/4" size lag bolts. We'd like to han...

These were recommended to me rather than normal galvanized 1/4" size lag bolts. We'd like to hang our porch swing from the 2x8 joists of the pressure treated deck. What is the load rating that these can support for a vertical hanging structure? Note that the brackets I have are two screws/lags per bracket. (Two brackets=4 total screws/lag bolts)
Asked by: Nigel
Please check with a structural engineer. All GRK structural values can be found in our ESR reports. (See ESR 2442.) If you have additional questions, please call our Customer Service team at 877-489-2726 from 8:00-5:00 CT Monday-Friday.
Answered by: BrandAnswers
Date published: 2017-06-29

Are these 316 SS?

Are these 316 SS?
Asked by: Support
This product is polymer plated.
Answered by: CommunityAnswer
Date published: 2017-05-14
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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 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
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
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