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Prices, Promotions, styles, and availability may vary. Our local stores do not honor online pricing. Prices and availability of products and services are subject to change without notice. Errors will be corrected where discovered, and Lowe's reserves the right to revoke any stated offer and to correct any errors, inaccuracies or omissions including after an order has been submitted.
100+ bought last week
SPAX 5/16-in x 3-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack
Item #5641073 |
Model #4581820800765
4.7
$29.98
Length Measurement: 3-in
Screw Thickness: 5/16-in
Package Quantity: 50
Maximum Qty of 500
SPAX 5/16-in x 3-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack
4.7
$29.98
Best Price. Guaranteed
Find a lower price on an exact item? We'll match it. Some exclusions apply.
Learn MoreThe SPAX Factor - For the craftsman that concentrates on the details, We Work for You. For the Pro that puts qualify first, we help you create stronger connections, enhance performance and improve results when your reputation is on the line. Say Good Bye to your fathers traditional lag. SPAX PowerLags offer superior installation performance and durability over traditional lag screws and carriage bolts for structural wood construction. Made of carbon steel and coated for long term durability to ensure your project endures. U.S made SPAX is your trusted partner for your fastening needs. Do it Once, Do it Right with SPAX.
Check out our Threads! Our patented thread serration technology allows the screw to be driven faster, reduces splitting in wood, and reduces driving torque by 40%. Let the SPAX FACTOR take some of the hassle out of your next project
Cold-rolled carbon steel wire heat treated to Grade 5 durability and plated with an HCR (High Corrosion Resistance) double barrier coating - HCR is tested and recognized for use in ground contact pressure treated lumber for exterior, freshwater general construction applications (eg AWPA UC1-UC4A, UCFA).
The ideal replacement for the conventional lag - IRC/IBC Code Compliant: TER-No 1912-07
T-Star plus drive provides superior bit engagement - Better bit engagement means quicker installation with less effort - Conveniently allows for one-hand overhead driving
The HCR (High Corrosion Resistant) double barrier coating is tested and recognized for use in ground contact and pressure treated lumber for exterior fresh water general construction applications
Engineered and Manufactured in the USA
Common applications: Landscaping timber, deck ledger attachment, fencing, exterior treated lumber, structural wood to wood connections
General | |||
|---|---|---|---|
Finish | Coated | Package Quantity | 50 |
Manufacturer Color/Finish | Black | Use Location | Exterior |
Series Name | PowerLags | Head Type | Washer |
Type | Structural wood screws | Thread Type | Coarse |
Material | Steel | Point Type | Sharp |
Dimensions | |||
|---|---|---|---|
Length Measurement | 3-in | Screw Thickness | 5/16-in |
Features | |||
|---|---|---|---|
Drive | Star | Multi-Material | No |
Materials Fastened | Wood to wood | ||
Certifications | |||
|---|---|---|---|
ACQ Approved | Yes | CA Residents: Prop 65 Warning(s) | No |
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 Lag Screws on Lowes.com
Review
71 Reviews
87% Recommend this product
Ratings may include incentivized customer reviews.
What Customers Are Saying
The product appears to have mixed performance and quality, with some customers praising the strong holding power, ease of installation, and durability, while others reported issues such as screws snapping or breaking, requiring pre-drilling, and inconsistent quality control. The reviews suggest the product can be suitable for certain applications, but users should carefully consider the project requirements and potentially test a small number before a larger purchase.
Customer review summary generated by AI, including incentivized reviews.71 Customer Reviews
Worked as advertised. Good screws.
Worked well. No pre-drilling needed and all the screws were straight.
ShobaOctober 28, 2025
From 5_SLASH_16-in x 5-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack Verified Purchaser
From 5_SLASH_16-in x 5-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack Verified Purchaser
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Black Coated Washers
I always love me some black coated washers!!!!!!!!!
BuilderManOctober 16, 2025
Verified Purchaser
Verified Purchaser
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Not screwing around
This screw does not mess around it pulls in nice and tight.
That guySeptember 16, 2025
From 5_SLASH_16-in x 5-in Black Coated Wafer -Head Exterior Structural wood screws Verified Purchaser
From 5_SLASH_16-in x 5-in Black Coated Wafer -Head Exterior Structural wood screws Verified Purchaser
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Great holding power but pricy.
Great no slip torx head. Great holding power. EZ to drive with a battery powered impact driver. I would give it 5 stars if it wasn’t so pricy.
ArtieSeptember 5, 2025
From 5_SLASH_16-in x 4-in Black Coated Washer -Head Exterior Structural wood screws Verified Purchaser
From 5_SLASH_16-in x 4-in Black Coated Washer -Head Exterior Structural wood screws Verified Purchaser
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nothing
worked as wanted
FredJuly 23, 2025
From 5_SLASH_16-in x 3-1_SLASH_2-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack Verified Purchaser
From 5_SLASH_16-in x 3-1_SLASH_2-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack Verified Purchaser
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Joist sistering
A little on the pricey side but what isn't now a days. Perfect for sistering joists.
HishtimJuly 13, 2025
From 5_SLASH_16-in x 4-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack Verified Purchaser
From 5_SLASH_16-in x 4-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack Verified Purchaser
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3 Questions
3 Questions
Timo on July 11, 2025
1
Answer
Verified Pro Lizzie on June 12, 2025
1
Answer
Verified Pro Smizles on March 15, 2024
1
Answer