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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"
Customer Reviews
4.9 Based on 1,010 Reviews
5 ★
95% 
959
4 ★
3% 
33
3 ★
1% 
13
2 ★
0% 
2
1 ★
0% 
3
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Filter Reviews:
03/26/2025
RB
Ronald B.
United States United States

Great 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.

03/20/2025
MG
Mario G.
United States United States

The screws were perfect for my project. Thanks so much !

My experience was fantastic.

03/19/2025
NC
Nancy C.
United States United States

Good customer service

Products are well made.

03/19/2025
I
Ian SVG verified by SHOP
United Kingdom United Kingdom

Excellent product and service, thanks

03/10/2025
TL
Tug L.
United States United States

Better 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

03/08/2025
LG
Laura G.
United States United States

I have to say

The style of the fencing was so good.

03/06/2025
TF
Tom F.
United States United States

Mantel 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

03/03/2025
JL
Jerome L.
United States United States

Clavo

So, you deserve a five star review, however I have some constructive criticism and would like to respond please. I think the product was what I needed as previous source ceased production of this particular clovis nail. I prefer purchasing from a U.S. company, especially one in my Northwest region. Thank you. Now, before I purchase again, as I found another supplier in the SE, I AM asking you to improve the product in two areas. First, is the finish, which flacked, right out of the box although it was wrapped in tissue, even just in handling, and in application where I used a small rubber mallet, low impact. I recommend both improved cleaning of the surface of any residual oils AND most important a primer coating. Brand X has not chipped or rusted and some I used on a project several years ago. Yours are now rusting immediately and require touch-up paint. Second, the nail welded on the reverse. I suggest a slightly larger gauge and especially a ring-shank nail. I AM certain that as some of the wood shrinks, (although it is already aged), some of these will fall off. I like your products. Pictures of your product, and project attached. I will need to purchase thirty or forty more. Please respond, Thank you Jerome

Old West Iron  ReviewOld West Iron  ReviewOld West Iron  ReviewOld West Iron  Review
02/28/2025
RS
Rod S.
United States United States

Lag bolts

Just what I wanted!

02/24/2025
S
Sandra
United States United States

Excellent quality with amazing look.

This product was above my expectations. Excellent quality, easy to install and amazing look! My project turned out better than what I imagined for my design.

Old West Iron  ReviewOld West Iron  Review
02/24/2025
J
JC
United States United States

Amazing look with great quality!

This product was above my expectations. My project looks better than what I imagined. Easy to install.

Old West Iron  ReviewOld West Iron  Review
02/23/2025
DM
Dorothy M.
United States United States

Happy Customer

Good quality and prompt service

02/23/2025
MC
mark c.
United States United States

highly valued supplier

for over a decade our design build company on the california coast has been working with owi to forge and supply authentic wrought iron products to our homes. every time they deliver and every time we get a beautifully unique product. if you have the patience and insight to work with creative “made in america” artisans, you won’t be disappointed and your home will be so much better for it. worth every penny. thank you jon and lisa. - mark cristofalo & company

02/16/2025
BR
Beth R.
United States United States

Absolutely perfect

These matched perfectly to my patina mantel. Love it!

Old West Iron  Review
02/13/2025
LR
Lorilei R.
United States United States

Stair Post Cap

Solid craftsmanship. Really love the rugged look it gave to finish my stairs.

Old West Iron  ReviewOld West Iron  ReviewOld West Iron  ReviewOld West Iron  ReviewOld West Iron  Review
02/12/2025
A Old West Iron Customer
PW
Peter W.
United States United States

Well made and artistic too

These work great with the 3"x3" old fashioned washers also ordered and also finished the same way. Look fantastic and strong as the job needed. Will order more from here and already recommending to others.

02/12/2025

Old West Iron

They look beautiful! We can not wait to help you with your future order! Thank you !

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