How it connects
The male round fence post slides axially into the female cylindrical socket bore and is clamped or anchored in place using set screws, through-bolts, or tight slip-fit seating.
Male and female halves
Female socket receiving the outside diameter of a round male pipe/post.
Usually connects to
- round steel fence post
- tubular metal fence pipe
- chain-link fence terminal/line post
Common sizes
- Typically sized to fit standard fence and pipe outside diameters, commonly 1-3/8 in, 1-5/8 in, 1-7/8 in, 2-3/8 in, and 2-7/8 in (approx. 35 mm to 73 mm OD).
Where it is used
fencingchain-link fence installationsignpost installationguardrails and handrails
Variations
- surface-mount flanged round socket
- ground-spike round post socket
- concrete-embedded round socket
How to recognise it
Recognised as an open upright circular collar or cylindrical cup mounted atop a flat flange base or ground anchor stake, featuring inner diameter matched to nominal round fence post OD and often containing lateral holes for set screws or bolts.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Square fence post socket | Square post sockets have four flat inner walls designed for square tubing/lumber, whereas round fence post slip sockets have a smooth cylindrical internal bore. |
| Round pipe slip-on fitting (Kee Klamp / Speed-Rail) | Structural pipe slip-on fittings are typically open-ended structural tees, elbows, or crosses with integrated hex set screws used for railing systems rather than dedicated post base anchors. |
Also called
round post base socketround fence post base collartubular post socket anchorpipe post surface mount collar
Good to know
Commonly found on surface-mount post plates, ground spike anchors (e.g. Pylex Spybase / Oz-Post), or core-mount adapters for tubular metal and chain-link fences.
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