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GRK RSS 5/16-in x 4-in Polymer Exterior Structural wood screws 100 -Per Box

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GRK RSS Structural screws are an easy to install lag alternative. Typical applications include structural decking, general framing, remodeling, structural applications, multi-ply and LVL fastening, and ledger board. The w-cut provides low installation torque which allows for fast driving and ease of install. The zip-tip feature allows for no pre-drilling and one-step installation. The unique thread design draws two substrates together while washer head allows zero gap joints. Our Climaseal coated screws provide corrosion resistance in pressure treated wood with corrosive ground contact.

Easy to install lag alternative for structural wood to wood fastening
1 Step install, no pre-drilling
RSS Structural screws are perfect for interior and exterior applications
Climatek coating is AC257 code approved for use in treated lumber
Superior clamping force on the first drive, 20% faster drive time
W-cut thread design reduces installation torque
Rugged enough for use in LVL, LSL, and other dense wood
ESR-2442 approved for structural applications
Limited lifetime warranty

General
Finish	Polymer	Number of Pieces	100
Manufacturer Color/Finish	Yellow Zinc	Head Type	Round washer
Series Name	RSS	Measure Type	Standard (SAE)
Type	Structural wood screws	Thread Type	Coarse
Material	Steel	Contact Type Allowed	None
Package Quantity	100	Point Type	Self-drilling
Use Location	Exterior

Dimensions
Head Diameter (Inches)	0.626-in	Package Weight (lbs.)	4.2
Length Measurement	4-in	Screw Thickness	5/16-in

Features
Coated	Yes	Materials Fastened	Wood to wood
Collated	No	Multi-Material	No
Drive	Star	Self-Drilling	Yes
Fastener Plating	Zinc	Self-Tapping	Yes

Certifications
ACQ Approved	Yes	CA Residents: Prop 65 Warning(s)	No
ACQ Coated	No

Warranty
Warranty	Limited lifetime

Compatibility
For Use on Plastic	No	For Use on Concrete	No
For Use on Composite	No	For Use on Drywall	No
For Use on Metal	No	For Use on Brick	No
For Use on Wood	Yes	For Use on Vinyl	No

Miscellaneous
UNSPSC	31161500

Check out the Best Selling Wood Screws on Lowes.com

Review

4.7 out of 5

39 Reviews

3 Star

2 Star

96% Recommend this product

Ratings may include incentivized customer reviews.

39 Customer Reviews

Sort By

Nothing to fear here...good product!

Would Recommend

Good screws with excellent star drive...bit included.

ButchJune 21, 2026
Verified Purchaser

Was this Review Helpful ?

Response from ITW Brands

Hi there, thanks for sharing your positive experience with our RSS Screws. We work hard to make sure our products are well designed. We’d love to hav...

ITW BrandsJune 23, 2026

Good strong screws with a lot of bite

Would Recommend

Solid screws but a little too easy to strip with the bit that is provided.

J2344May 20, 2026
Verified Purchaser

Was this Review Helpful ?

Response from ITW Brands

Hi there, thanks for sharing your positive experience with our RSS Screws. We work hard to make sure our products are well designed. We’d love to hav...

ITW BrandsMay 21, 2026

Performance as advertised.

Would Recommend

GeorgeApril 23, 2026
Verified Purchaser

Was this Review Helpful ?

Response from ITW Brands

Hi there, thanks for sharing your positive experience with our RSS Screws. We work hard to make sure our products are well designed. We’d love to hav...

ITW BrandsApril 28, 2026

Product quality

Would Recommend

Quality

BirdhunterApril 2, 2026
Verified Purchaser

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/b5c8f2b1-0b24-5604-a7f7-c02702e01a24

Was this Review Helpful ?

Quick and easy

Very good wood fastners.

MikeApril 1, 2026
Verified Purchaser

Was this Review Helpful ?

Response from ITW Brands

Hi there, thanks for sharing your positive experience with our RSS Screws. We work hard to make sure our products are well designed. We’d love to hav...

ITW BrandsApril 2, 2026

Able to reuse

Would Recommend

Screws have good holding power and the ability to reuse them is good thing.

NormanJanuary 10, 2026
Verified Purchaser

Was this Review Helpful ?

Response from ITW Brands

Hi there, thanks for sharing your positive experience with our RSS Screws. We work hard to make sure our products are well designed. We’d love to hav...

ITW BrandsJanuary 13, 2026

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		Name	Current Item GRKRSS 5/16-in x 4-in Polymer Exterior Structural wood screws 100 -Per Box
		Ratings	39
		Length Measurement	4-in
		Type	Structural wood screws
		Material	Steel
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