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3/8" Square Head Lag Screws
Add a touch of timeless craftsmanship to your projects with our 3/8" Square Head Lag Screws, hand-forged from durable iron by skilled blacksmiths. These authentic, artisan-crafted screws combine strength with rustic charm, bringing character and functionality to every application. Whether you're building custom furniture, hanging vintage-style signs, or working on restoration projects, these lags provide both reliability and aesthetic appeal.
Designed for creators who value quality and detail, each screw showcases the distinct markings of expert blacksmithing—making every piece a unique work of art. Beyond their beautiful design, these lag screws offer superior durability, ensuring your projects are built to last. Perfect for adding that authentic, handmade look to tables, doors, cabinetry, and more, they’re the ideal finishing touch for anyone passionate about fine craftsmanship.
Choose tools that match the pride you take in your work. With our 3/8" Square Head Lag Screws, you’ll turn every build into a masterpiece.
- Head Shape: Square
- Head Size: 9/16"
- Socket Size: 9/16" 8-Point
- Head Height: 1/4"
- Shank Diameter: 3/8"
- Thread Pitch: 7
- Pilot Hole: soft wood 11/64"
- Pilot Hole: hard wood 1/4"
Tool Talk:
Everything You Need to Know About Lag Bolts
If you are a DIYer, then you have probably heard of lag bolts. But what are these exactly? Here's everything you need to know about this fastener.
Top 12 Uses of Lag Bolts and Decorative Bolts for Your Home Decor
Looking for the best lag bolts and decorative bolts to spruce up your home decor? Then check out some of these examples that might be perfect for you.
Hammered Lag Bolts Vs. Smooth: Which Is Right for You?
Pair large text with an image to give focus to your chosen product, collection, or blog post. Add details on availability, style, or even provide a review.
Customer Reviews
4.9 Based on 1,018 Reviews
5 ★
95%
968
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3 ★
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12
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04/12/2025
JJ
United StatesOld West Iron Completes 300 Year Old Rough Hewn Mantle
Rust and hammered is the perfect way to incorporate new with the old. Old West Iron carriage bolts are every bit as historical as the chestnut antique farmhouse beams. George Washington himself would approve, although he might tell a little white lie the same craftsman made both.
2" x 2"
04/10/2025
RG
United StatesVery pleased
Unique high quality merchandise.
Copper
04/07/2025
CD
United StatesPlain Straight Iron Latch
Another great product from Old West Iron!
Aged Bronze / Oval Screws
04/06/2025
EK
United StatesCabinet Handle
The raw iron cabinet handle fit perfectly. Adds the right look to the cabinet work.
brushed & oiled / 6"
04/06/2025
MG
United StatesAwesome latch
Excellent latch, well made, solid and looks the part.
Thru Bolt
03/31/2025
MA
United Statesgreat product, great service
I needed something very specific for a small project. Old West Iron had what I needed! Great quality. And they handled my small order quickly and effectively. Thanks.
Black / Smooth
03/31/2025
Old West Iron
Thank you for your feedback!
03/30/2025
JG
United StatesAwesome service!
Product is perfect. People are better. What else do you need?
03/31/2025
Old West Iron
Thank you for your kind words!
03/28/2025
A
United StatesVery Nice
This bathroom set was just what I was hoping for. These are strong and sturdy and the bronze finish looks great. I think it took about 3 weeks from placing my order to the package arriving at my door.
03/31/2025
Old West Iron
Thank you for your feedback!
03/27/2025
I
United StatesInfinity heart sculpture is great, arrived within stated time frame and looks just like pics
03/26/2025
RB
United StatesGreat customer service
Loved the washers I ordered, Very high quality. Customer service called me and verified the details shortly after I ordered. Personal touch is appreciated. I will use them again.
1" x 1" Square
03/31/2025
Old West Iron
Thank you for your feedback!
03/20/2025
MG
United StatesThe screws were perfect for my project. Thanks so much !
My experience was fantastic.
03/31/2025
Old West Iron
Thank you for your feedback!
03/19/2025
NC
United StatesGood customer service
Products are well made.
03/31/2025
Old West Iron
Thank you for your feedback!
03/19/2025
I
United KingdomExcellent product and service, thanks
03/10/2025
TL
United StatesBetter than the originals
I have built numerous historical (replicas) wood project for many years using traditional wood working tools and was always on the lookout for affordable square headed bolts and lags. Old West has them at affordable prices and almost limitless size selections. They are exactly the same as the originals manufactured up to WW ll. As an additional plus, staff was exceptionally helpful during my phone order and it was a pleasure to speak with a human who knew the product line. Many Thanks from a new lifetime customer. Tug NW Montana
03/31/2025
Old West Iron
Thank you for your feedback, it was a wonder to work with you!
03/08/2025
LG
United StatesI have to say
The style of the fencing was so good.
03/31/2025
Old West Iron
Thank you for your feedback!
03/06/2025
TF
United StatesMantel straps, strapping & clavos
Great attention to detail. Exactly as described on the website. Very helpful with my phone questions. Quick turnaround time for custom work. Great product Great price
03/31/2025
Old West Iron
Thank you for your feedback!