Best Round Post Anchors for Concrete and Fence Mounting
The best round post anchor for concrete is a floor flange sized to the post’s actual outside diameter, with a base that suits the mounting area. For a 2-3/8-inch post, consider the GBGS heavy-duty flange or its black powder-coated version. The Epcee two-pack fits 1-7/8-inch posts, while the GBGS four-pack fits 1-5/8-inch pipe. For smaller posts, the Fanmao four-pack fits 1.315-inch pipe. Check dimensions before buying because nominal post size and actual outside diameter can differ.
| Product | Post fit | Pack | Best for |
|---|---|---|---|
| GBGS Heavy-Duty Flange | 2-3/8-inch OD | 1 | Thick flange and 5/8-inch bolt holes |
| Epcee Galvanized Flanges | 1-7/8-inch OD | 2 | Ductile iron construction |
| GBGS 1-5/8-Inch Bases | 1-5/8-inch OD | 4 | Multiple smaller posts |
| GBGS Black Flange | 2-3/8-inch OD | 1 | Black powder-coated finish |
| Fanmao Electro-Galvanized Bases | 1.315-inch OD | 4 | Smaller chain-link pipe |
GBGS 2-3/8-Inch Heavy-Duty Post Flange
This GBGS floor flange is best for buyers fitting a larger round post with an actual 2-3/8-inch outside diameter. Its listed fit is described as a 2-1/2-inch post size that fits 2-3/8-inch OD pipe, so verify the pipe measurement before ordering.
- Base measures 5-3/4 by 5-3/4 inches.
- Height is 4-1/8 inches.
- Pre-drilled holes are specified for 5/8-inch bolts.
- Listed plate thickness is 1/4 inch.
It was selected for the larger stated flange thickness and the clearly specified bolt-hole size. Choose this if those dimensions match your post and mounting plan. The product information does not specify included concrete anchors, so confirm the needed fasteners separately.
Epcee Two-Pack Galvanized Post Flanges
The Epcee flange is best for two posts measuring 1-7/8 inches in actual outside diameter. The listing calls this a 2-inch post size. It describes a one-piece QT450-10 ductile iron construction with a galvanized baking-paint surface.
- Each base measures 5.5 by 5.5 inches and stands 4.25 inches tall.
- The two-pack is intended for round steel posts, including chain-link posts and mailbox or lamp posts.
- The listing describes CNC-turned openings and flat bases.
This product was selected for buyers who need two flanges and whose posts match its exact stated fit. Its nominal 2-inch label can be misleading if the post’s actual outside diameter is different. The listing does not provide bolt-hole dimensions, so check mounting requirements before purchase.
GBGS Four-Pack For 1-5/8-Inch Pipe
These GBGS bases are best for buyers installing multiple posts made from 1-5/8-inch outside-diameter round pipe. The listing identifies the fit as Schedule 40 pipe and includes a set screw.
- Four bases are included.
- Base plate measures 3-5/8 inches in diameter.
- Height is 3-1/2 inches.
- Base thickness is listed as 3/16 inch, and socket wall thickness as 3/32 inch.
It was chosen for its four-unit pack and size-specific fit. The base is smaller than the 5-3/4-inch square plates in some other options, which may suit a compact mounting footprint. Avoid this model if your pipe is not 1-5/8 inches OD; its listed dimensions do not establish fit for other post sizes.
GBGS Black 2-3/8-Inch Floor Flange
This GBGS flange is best for a 2-3/8-inch OD post when a black finish is preferred. The product listing specifies low-carbon steel with a powder-coated finish and gives the same general base dimensions as the other large GBGS option.
- Base measures 5-3/4 by 5-3/4 inches.
- Height is 4-1/8 inches.
- The listed post-size description is 2-1/2 inches, with a stated 2-3/8-inch OD fit.
Choose this if the black finish is a priority and the post measurement matches. It was selected as a finish-focused alternative to the thick, bolt-hole-specified GBGS flange. The listing does not state plate thickness or bolt-hole size, so do not assume those details match the other model.
Fanmao Four-Pack For 1.315-Inch Pipe
Fanmao’s four-pack is best for smaller chain-link fence pipe measuring 1.315 inches in actual outside diameter. The listing describes low-carbon steel with an electro-galvanized finish and mentions fence repair, mailbox reinforcement, trellis installation, and railing repair as uses.
It was selected for its specific smaller-pipe fit and multi-piece pack. Check the actual post diameter rather than relying on a nominal pipe label. The supplied details do not include base dimensions or bolt-hole size, so compare those requirements with your installation before choosing this product.
Buying Guide: How To Choose A Round Post Anchor
What post size should I measure?
Measure the outside diameter of the post where it enters the flange. Several listings use a nominal size alongside a different actual outside diameter: for example, a listed 2-1/2-inch size may fit 2-3/8-inch pipe, while a 2-inch size may fit 1-7/8-inch pipe. Match the product’s actual fit to your pipe rather than assuming nominal sizes are interchangeable.
How large should the base be?
Compare the flange footprint with the available concrete surface and the position of existing holes or edges. The reviewed large GBGS models have 5-3/4-inch square bases, while the smaller GBGS model has a 3-5/8-inch-diameter base. A larger plate is not automatically better for every site; the mounting surface and fastener layout must also work.
Which finish or material matters?
Product details include low-carbon steel with powder coating, low-carbon steel with electro-galvanizing, and a ductile iron flange with a galvanized baking-paint surface. Select by the listed material and finish, while considering the conditions where the post will be installed. Do not treat different finishes as identical.
What should I check before mounting to concrete?
Confirm the flange’s hole pattern, hole size, and whether the required concrete fasteners are provided; the supplied product details do not consistently state these points. Check that the flange sits on the intended surface and that the post fits its socket. Follow the fastener manufacturer’s instructions for the concrete and application.
Frequently Asked Questions
Can a round post floor flange attach a post to concrete?
A floor flange provides a base for mounting a compatible round post to a surface. You must confirm its holes and select suitable concrete fasteners for the installation; the listings do not all specify included anchors.
Are 2-inch and 1-7/8-inch posts the same?
Not necessarily. A nominal 2-inch post may have an actual outside diameter of 1-7/8 inches. Check the stated actual fit and measure the post.
Does every flange in this list fit a chain-link fence post?
No. The products fit different outside diameters, from 1.315 inches to 2-3/8 inches. Select the flange that matches your post.
Are concrete bolts included?
The provided product details do not confirm included concrete bolts. Check the listing and plan to source fasteners separately if needed.