Set Of 12 Antique Square Nails 2.5” Heavy Duty Iron Hardware

These are the Clydesdale size—extra-thick antique square-cut nails measuring approx. 2.5" long and built with serious iron mass. Salvaged from old Pacific Northwest lumber, they have the classic early machine-cut square shank (1800s–early 1900s era) that bites into wood grain and holds like old-world hardware should.

Strength & Mass

12 nails average ~3.9 oz per lot

roughly 1.7× the iron mass of our Workhorse nails

thick shank & bold head—great for exposed rustic joinery

Why Builders Like These

square shank resists pull-out better than modern round nails

ideal for benches, barn doors, timber accents, farm-table builds, visible architectural details

the fastener itself becomes part of the design

Authentic Old Iron

These aren’t modern repro nails. They’re true antique square-cut hardware, the kind made when nails were sheared from iron plate and headed by early machines—not mass-produced wire nails. You get real age, real patina, and real bite.

Specs

length: approx. 2.5"

shank near head: approx. 7mm × 4mm

iron with natural aged finish

Notes

Expect minor bends from removal—tap straight if desired. If you prefer a slimmer profile, check our Workhorse size listing.

These are antique nails reclaimed from old lumber and some may show specks of historical paint or patina typical of salvage materials. Old coatings may include lead, which is normal for hardware of this age. Intended for adult-use installation.

Sourced by Seattle Vintage Hardware.