Square Head Lag Screws

Square Head Lag Screws: Rustic Black Oxide Lag Bolts with Timeless Old-World Charm

 

Square head lag screws (also known as square head lag bolts) are the perfect finishing touch for any project that calls for authentic vintage character. These rustic black oxide lag screws give your build that classic "old timey" forged-iron look you love, while delivering the heavy-duty strength needed for real timber construction.
 
Featuring the traditional square head profile and a rich matte black oxide finish, our square head lag screws stand out from ordinary hex-head fasteners. The square head not only adds beautiful decorative detail but also allows solid torque with a wrench or our matching square head sockets—no slipping, no stripped heads, just reliable installation every time.
 
Why Choose Our Square Head Lag Screws?
  • Authentic Rustic Aesthetic — Matte black oxide coating creates a timeless, non-reflective forged look that complements exposed hardware and turns functional fasteners into a design feature.
  • Strong Holding Power — Coarse wood threads and sharp tapered point bite deep into timber for excellent pull-out resistance—far superior to standard screws for structural and decorative applications.
  • Perfect for Visible Projects — Ideal for barn doors, reclaimed wood furniture, pergolas, log cabins, timber framing, and any build where the hardware is meant to be seen.
  • Seamless Compatibility — Designed to pair beautifully with our custom timber brackets, beam connectors, post bases, and other metalwork for a cohesive, professional package.
  • Easy Installation — Use with our square head sockets (8-point design) for fast, effortless driving; add washers for surface protection and a polished finish.
Whether you're assembling a rustic barn door, mounting decorative brackets, or completing a full timber frame, these square head lag screws transform ordinary fastening into a statement of craftsmanship. They add that sought-after "old timey" charm while ensuring your project holds strong for years to come.
 
Browse our available diameters and lengths below (including popular 1/4", 3/8", and 1/2" sizes in multiple lengths from 1-1/2" to 4"+). All are in stock and ready to ship. Pair them with our square head bolts, square nuts, or full bracket kits for a complete vintage hardware solution that sets your work apart from big-box generics.
 
Ready to add that rustic touch?
Shop square head lag screws now or contact us for custom recommendations and bulk pricing. Your project deserves hardware that looks as good as it performs—build with Cutting Edge Metals today!