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Model #112221

Store SKU #517498

5/16 in. x 3-1/8 in. Star Drive Washer Head Rugged Structural Wood Screw (45-Pack)

$2687
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  • Easy to install lag screw alternative
  • Integrated washer head allows for maximum clamping force
  • For interior / exterior use
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Price:
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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
  • May be used as a lag screw alternative
  • W-cut thread design

Additional Resources

From the Manufacturer

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5/16 in. x 3-1/8 in. Star Drive Washer Head Rugged Structural Wood Screw (45-Pack)
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BrandSPAXGRK FastenersGRK FastenersGRK Fasteners
Name1/4 in. x 3 in. Powerlag T-Star Drive Washer Head Yellow Zinc Coated Lag Screw (50 per Box)5/16 in. x 3-1/8 in. Star Drive Washer Head Rugged Structural Wood Screw (45-Pack)5/16 in. x 4 in. Star Drive Round Head Rugged Structural Wood Screw (45-Piece per-Pack)5/16 in. x 5-1/8 in. Star Drive Low Head Washer Rugged Structural Wood Screw (40-Piece per Pack)
Price
$1599
$2687
$2687
$3867
/box
Ratings
(17)
(574)
(574)
(574)
Size1/4 in5/16 in5/16 in5/16 in
Screw Length3 in3-1/8 in4 in5-1/8 in
Fastener PlatingYellow ZincCoatedCoatedCoated
Drive StyleStarStarStarStar
Package Quantity50454540
Interior/ExteriorInteriorExterior,InteriorExterior,InteriorExterior,Interior
Fastener/Connector MaterialSteelSteelSteelSteel
Head StyleWasher HeadWasher HeadRound HeadLow Profile Washer
FeaturesACQ Rated,Coated,Self Drilling,Self Tapping,Serrated EdgesCoatedACQ Rated,Coated,Self Drilling,Self TappingACQ Rated,Coated
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Specifications

Dimensions

Screw Length3-1/8 inThread Pitch (mm)3.5 mm
Threads Per Inch (TPI)7.2

Details

Color FamilyYellowDrive StyleStar
Fastener PlatingCoatedFastener Thread TypeStandard
Fastener TypeWood ScrewFastener/Connector MaterialSteel
FeaturesCoatedFinishClimatek Coated
Finish FamilyYellowGradeAC257
Head StyleWasher HeadIncludedDriver Bit
Interior/ExteriorExterior,InteriorMeasurement StandardSAE
Package Quantity45Product Weight (lb.)0.036 lb
Returnable90-DaySize5/16 in

Warranty / Certifications

Manufacturer WarrantyNo

Questions & Answers

Typical questions asked about products:

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  • What are the dimensions of the product?

Customer Reviews

  • 4.9
    out of 574 reviews
  • 97%recommend this product
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Showing 1-10 of 574 reviews
Easy and super strong
Worked great for holding together a 4x4 pressure treated frame
by
  • Verified Purchase
  • Recommended
Do not use on exterior projects or PT wood
Completely corrodes into rust in a year. I built several projects with GRK and all screws are failing some are so bad the head breaks off. I am going to remove all of them and replace with stainless. Horrible product and waste of time and money.
by
    9 found this review helpful
    STRONG
    I used two to mount a BMW wheel on the wall of my garage. I pobably only needed one as i coud do chin ups on it! I tried to remove the coating with a wire wheel to get it silver but had to use a sanding wheel. Looks like it would hold up to the elements outside.
    by
      • Recommended
      1 found this review helpful
      I used these fasteners to hold 4' x 8' sheets of 1/4" peg-board to the wall with nylon spacers be...
      I used these fasteners to hold 4' x 8' sheets of 1/4" peg-board to the wall with nylon spacers behind. Now there are shovels, rakes, pitch-forks and the like hanging on the peg-board. These fasteners might be above and beyond, but I do not have to worry about the things coming off the wall.
      by
      • DIY
      • Verified Purchase
      • Recommended
      1 found this review helpful
      Worked as designed. Used them to attach a mailbox to the post
      Worked as designed. Used them to attach a mailbox to the post
      by
      • Verified Purchase
      • Recommended
      Recommend by my building inspector and it has saved me money and time. Impact driver drills it in...
      Recommend by my building inspector and it has saved me money and time. Impact driver drills it in in as little as 10 seconds.
      by
      • Verified Purchase
      • Recommended
      Used for a lofted bed assembly and worked great. Easy to use and hold well.
      Used for a lofted bed assembly and worked great. Easy to use and hold well.
      by
      • Verified Purchase
      • Recommended
      2 found this review helpful
      I just had a new pole barn built, and the builders used these screws. It took a bit to find them...
      I just had a new pole barn built, and the builders used these screws. It took a bit to find them, because they are not well advertised, but my wife found them at Home Depot. These screws are awesome. I had some customization on the new barn, so I bought two boxes of these, then 4 more for the farm. I liked the design and performance so well, I bought some #10's for smaller work. These screws drive easy and hold. If you wanted even better hold, get longer screws, but the ones I bought worked great through 2 inch wood. All in all, I can see me switching to these screws over lots of other kinds Phillips head screws.
      by
      • Verified Purchase
      • Recommended
      1 found this review helpful
      Like the screws, T30 tip design doesn't strip out . Threads grab well and using lower speed 1 the...
      Like the screws, T30 tip design doesn't strip out . Threads grab well and using lower speed 1 the torque draws boards up tight. I Used hundred or so on my barn project. Expensive but worth it
      by
      • Verified Purchase
      • Recommended
      Although this product was not what I had intended to purchase (I was looking for #10 or #12 screw...
      Although this product was not what I had intended to purchase (I was looking for #10 or #12 screws in 4-in or 4.5" lengths), they worked well for my project. I wish there were MORE options such as variability in package/qty sizes. I bought these (which were a larger OD than I initially intended) because the qty in the package was more suited to my needs. I'd buy again.
      by
      • Verified Purchase
      • Recommended
      Showing 1-10 of 574 reviews