Insaga 2-inch Round Post Base — Heavy-Duty Black Steel Floor Flange with Set Screws & Anchors

Insaga 2" Round Post Base Floor Flange is a heavy-duty carbon-steel mounting bracket that secures 2-inch round posts for fences, mailboxes, lamp posts, and other outdoor fixtures.

This precision-made floor flange combines a powder-coated steel body, stable welded construction, and a built-in internal post stop to hold posts firmly in place. It ships with expansion bolts and side set screws so you can anchor and level a post quickly on concrete or masonry surfaces. The black finish resists corrosion and blends discreetly with outdoor hardware for a clean, professional look.

How does this post base keep a 2" pipe from slipping or wobbling?

The flange includes a smaller internal opening at the bottom that acts as a post stop, preventing the pipe from sliding through the bracket. Welded seams and the two side set screws clamp the post tightly while the expansion bolts secure the base to the substrate.

• Internal anchor step prevents downward movement of the post.
• Two side set screws allow for precise lateral tightening.
• Welded construction increases rigidity and reduces flex.
• Concrete expansion bolts supply strong substrate anchoring.

Is installation on concrete or masonry complicated?

Installation is straightforward with basic tools: mark, drill a 12mm hole, fix the flange with the supplied expansion anchors, slide in the post and tighten the set screws. The package includes three expansion bolts and two set screws so you have what you need for one standard mount.

• Pre-drill a 0.47 in (12 mm) hole as a starter for anchors.
• Use the included expansion bolts for secure concrete attachment.
• Slide post into flange and use side screws to lock position.
• Allow minor adjustments to level the post before final tightening.

What materials and finish are used, and how durable is it outdoors?

The flange is fabricated from heavy-duty carbon steel and finished with a black powder coat that improves resistance to weathering and abrasion. While no metal product is entirely maintenance-free, the combination of thick steel, solid welds, and powder coating helps the flange withstand outdoor exposures for extended service life.

• Heavy carbon-steel body for structural strength.
• Black powder-coat finish for corrosion resistance and low sheen.
• Smooth welds reduce stress points and improve longevity.
• Designed for typical outdoor fixtures like mailboxes and lamp posts.

What comes in the package and what extra tools do I need?

Each kit includes one Insaga round post base, three expansion bolts, and two side set screws so you can mount a single post right away. You will need a drill with a 12mm masonry bit, a wrench or socket for the expansion bolts, and a hex/Allen tool or screwdriver for the set screws.

• Included: 1x post base, 3x expansion anchors, 2x side set screws.
• Required: drill with 12mm bit, appropriate wrench/socket, hex key or screwdriver.
• Optional: thread-lock compound for extra security on set screws.

Who is this for: This Insaga flange is aimed at DIY homeowners, handypersons, and professional installers who need a compact, dependable mounting solution for standard 2-inch round posts. It’s well suited for mailbox installations, small fence posts, decorative lamp posts, and other lightweight structural posts where a low-profile, secure base is required. Choose this bracket when you want a robust steel base with an internal post stop and the hardware needed for a clean anchoring to concrete or masonry.