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SPAX 5/16-in x 3-in Black Coated Washer -Head Exterior Structural wood screws
Item #3753066 |
Model #4581820800767
4.7
$1.38
Length Measurement: 3-in
Screw Thickness: 5/16-in
Package Quantity: 1
Maximum Qty of 500
SPAX 5/16-in x 3-in Black Coated Washer -Head Exterior Structural wood screws
4.7
$1.38
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
The ideal replacement for the conventional lag - IRC/IBC Code Compliant: TER-No 1912-07
True to size thread diameters, grade 5 heat treat, and the washer head style are just some of this fasteners distinct advantages - Tested under the toughest scenarios to give you confidence in every connection
T-Star 6 lobe design is compatible with all industry standard bits and provides superior bit engagement
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
SPAX 5/16-in PowerLags require a T-Star driver bit: T-40 Bit
General | |||
|---|---|---|---|
Finish | Coated | Package Quantity | 1 |
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 |
Package Weight (lbs.) | 0.047 | ||
Features | |||
|---|---|---|---|
Coated | Yes | Multi-Material | No |
Drive | Star | Self-Tapping | Yes |
Materials Fastened | Wood to wood | ||
Certifications | |||
|---|---|---|---|
ACQ Approved | Yes | CA Residents: Prop 65 Warning(s) | No |
ACQ Coated | Yes | ||
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
76 Reviews
88% Recommend this product
Ratings may include incentivized customer reviews.
What Customers Are Saying
The product has mixed reviews. Customers praised its strong holding power, easy installation, and durability, but some reported issues like screws snapping or breaking during installation, the need for pre-drilling, and inconsistent quality. The positives include excellent grip, ease of use with power tools, and good value. However, the negatives include inconsistent quality, screws snapping or breaking, and concerns about rust and corrosion over time. Customers should carefully consider the specific application and may need to pre-drill holes to avoid breakage.
Customer review summary generated by AI, including incentivized reviews.76 Customer Reviews
The best
Great structural fastener
CoachNovember 22, 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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Try the product
Great product. Strong and good holding power
November 22, 2025
From 5_SLASH_16-in x 6-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack Verified Purchaser
From 5_SLASH_16-in x 6-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack Verified Purchaser
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Have a strong drill driver
Great wood anchors, put 4x4 together and they are solid
PhdyNovember 11, 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
Was this Review Helpful ?
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
Was this Review Helpful ?
Black Coated Washers
I always love me some black coated washers!!!!!!!!!
BuilderManOctober 16, 2025
From 5_SLASH_16-in x 3-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack Verified Purchaser
From 5_SLASH_16-in x 3-in Black Coated Washer -Head Exterior Structural wood screws 50 -Pack 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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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