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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.
1k+ bought last week
Deck Plus 3/8-in x 4-in Black Epoxy Hex -Head Exterior Lag screws
Item #1339842 |
Model #261176
4.7
$1.78
Manufacturer Color/Finish: Black
$1.78
Length Measurement: 4-in
Screw Thickness: 3/8-in
Deck Plus 3/8-in x 4-in Black Epoxy Hex -Head Exterior Lag screws
4.7
$1.78
Image may not reflect exact product size
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Learn MoreManufactured to be extremely sturdy, lag screws are some of the toughest fasteners. These black coated hex lag screws provide adequate corrosion and rust protection, making them a great choice for outdoor DIY projects. Use this lag screw to attach objects to wood and anchor masonry. Common applications include retaining walls, deck frames, and outdoor play equipment. For masonry application, use the screw in conjunction with a lag shield. These coated lag screws have coarse threads designed for pre-drilled holes to prevent splitting or snapping. Minimal clearance is required above the fastener. The screws have a hexagonal drive for simple installation and controlled traction with a socket or wrench. Use in a pre-drilled hole; see product package for pre-drilling instructions.
Designed to attach objects to wood and anchor masonry
Black epoxy finish provides superior corrosion and rust protection
Meets most local building code requirements required by municipalities nationally
Coarse threads requiring a pre-drilled hole with minimal clearance above the fastener
Hex drive for controlled traction with a socket or wrench
Parts carry a limited lifetime warranty against rust and corrosion
Safe for treated lumber
Parts measure 3/8-in diameter and 4-in long
General | |||
|---|---|---|---|
Finish | Epoxy | Number of Pieces | 1 |
Manufacturer Color/Finish | Black | Head Type | Hex |
Type | Lag screws | Thread Type | Coarse |
Material | Steel | Fastener Speed Code | PBO |
Package Quantity | 1 | Point Type | Standard |
Use Location | Exterior | ||
Dimensions | |||
|---|---|---|---|
Length Measurement | 4-in | Screw Thickness | 3/8-in |
Package Weight (lbs.) | 2.64 | ||
Features | |||
|---|---|---|---|
Coated | Yes | Multi-Material | Yes |
Drive | Hex | Self-Drilling | No |
Fastener Plating | Zinc | Self-Tapping | No |
Materials Fastened | Universal | ||
Certifications | |||
|---|---|---|---|
ACQ Approved | Yes | CA Residents: Prop 65 Warning(s) | No |
ACQ Coated | Yes | ||
Warranty | |||
|---|---|---|---|
Warranty | Limited lifetime | ||
Compatibility | |||
|---|---|---|---|
For Use on Plastic | No | For Use on Concrete | Yes |
For Use on Composite | No | For Use on Drywall | No |
For Use on Metal | No | For Use on Brick | Yes |
For Use on Wood | Yes | For Use on Vinyl | No |
Miscellaneous | |||
|---|---|---|---|
UNSPSC | 31161500 | ||
Check out the Best Selling Lag Screws on Lowes.com
Review
321 Reviews
89% Recommend this product
Ratings may include incentivized customer reviews.
+ 5 images
What Customers Are Saying
The product is generally well-received, with customers praising its sturdy, durable construction and easy installation. Key strengths include the heavy-duty design, corrosion-resistant coating, and suitability for a variety of outdoor projects. While a few isolated issues were reported, such as occasional bolt head breakage or coating chipping, the majority of customers were highly satisfied with the product's performance and quality.
Customer review summary generated by AI, including incentivized reviews.321 Customer Reviews
Good
Good quality and I like the black option. But it does come off a bit when under pressure
JdccNovember 9, 2025
From 1_SLASH_2-in x 4-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
From 1_SLASH_2-in x 4-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
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Good price, good selection, good quality
I liked you could buy individual screws.
MJKHNovember 4, 2025
From 1_SLASH_4-in x 1-1_SLASH_2-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
From 1_SLASH_4-in x 1-1_SLASH_2-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
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Perfect Upgrade to Any Build
These black hex head lag bolts were perfect upgraded look for securely attaching our deck's rail posts (4"x4") to the main deck and platform frame.
MsSantaTgrNovember 1, 2025
From 1_SLASH_2-in x 6-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
From 1_SLASH_2-in x 6-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
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Great quality for the cost
I was going to paint the screws I had black, but when I saw these I figured it was best for my project that these all look the same and the quality of the color
JrvoloverOctober 25, 2025
From 1_SLASH_4-in x 3-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
From 1_SLASH_4-in x 3-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
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Should be stronger
3 of 10 snapped
JohnnyOctober 9, 2025
From 1_SLASH_4-in x 3-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
From 1_SLASH_4-in x 3-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
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do not step on this if dropped
its a screw it does what it is made for
shmoeSeptember 28, 2025
From 3_SLASH_8-in x 3-in Gray Epoxy Hex -Head Exterior Lag screws Verified Purchaser
From 3_SLASH_8-in x 3-in Gray Epoxy Hex -Head Exterior Lag screws Verified Purchaser
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Lag bolts
Filled my need perfectly
Tire gaugeSeptember 25, 2025
From 1_SLASH_4-in x 2-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
From 1_SLASH_4-in x 2-in Black Epoxy Hex -Head Exterior Lag screws Verified Purchaser
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20 Questions
20 Questions
invalidcharacter on September 16, 2017
2
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Sean on October 2, 2023
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Bowdy on May 20, 2021
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chris on October 16, 2020
1
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Hello, We’re sorry to hear that this product was unsatisfactory and did not meet or perform to your expectations. We will continue to monitor product...