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5/16" Square Head Lag Screws
Enhance your next project with the timeless craftsmanship of our 5/16" Square Head Lag Screws. Each screw is hand-forged from high-quality iron by skilled blacksmiths, making these lag screws as durable as they are visually striking. The square head design exudes a classic, vintage aesthetic, perfect for adding a rustic touch to furniture, architectural restorations, or decor installations.
These lag screws go beyond function—they’re pieces of art with utility built in. Whether you're assembling custom furniture, hanging a wooden sign with character, or enhancing an industrial-style project, their exceptional strength and rugged charm ensure they'll stand out. Designed to meet your practical and aesthetic needs, they provide unmatched stability while delivering that hand-forged, authentic look no modern machine can replicate.
Choose the 5/16" Square Head Lag Screws for your projects and elevate your craftsmanship with a nod to tradition. When quality, style, and durability matter, these lag screws are the ideal choice.
- Head Shape: Square
- Head Size: 1/2"
- Socket Size: 1/2" 8 Point Socket
- Head Height: 3/16"
- Shank Diameter: 5/16"
- Thread Pitch: 9
- Pilot Hole: soft wood 9/64"
- Pilot Hole: hard wood 7/32"
Tool Talk:
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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.
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Customer Reviews
4.9 Based on 1,010 Reviews
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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
03/20/2025
MG
United StatesThe screws were perfect for my project. Thanks so much !
My experience was fantastic.
03/19/2025
NC
United StatesGood customer service
Products are well made.
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
03/08/2025
LG
United StatesI have to say
The style of the fencing was so good.
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
03/03/2025
JL
United StatesClavo
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
02/28/2025
RS
United StatesLag bolts
Just what I wanted!
02/24/2025
S
United StatesExcellent 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.
02/24/2025
J
United StatesAmazing look with great quality!
This product was above my expectations. My project looks better than what I imagined. Easy to install.
02/23/2025
DM
United StatesHappy Customer
Good quality and prompt service
02/23/2025
MC
United Stateshighly 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
United StatesAbsolutely perfect
These matched perfectly to my patina mantel. Love it!
02/13/2025
LR
United StatesStair Post Cap
Solid craftsmanship. Really love the rugged look it gave to finish my stairs.
5 1/2" x 5 1/2"
02/12/2025
PW
United StatesWell 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.
6"
02/12/2025
Old West Iron
They look beautiful! We can not wait to help you with your future order! Thank you !